Which Blood Tests Confirm Hepatitis A and What Liver Function Results Mean

The lab slip arrives in the patient portal at 6:40 in the morning, before the coffee is ready. Half the lines are flagged in red. ALT is not just high; it is a number that looks like a typing error. Underneath sit three words nobody expected to see together: hepatitis A, IgM, positive.

For most people this is the first time they have heard their own liver described in numbers. The urine had been darker for a few days, the appetite gone, a low-grade tiredness blamed on work. Now a hepatitis A blood test has turned a vague week into a diagnosis, and the questions come fast. Is this the dangerous kind? Who else could have caught it? Why is one antibody good news and another bad?

The answers are more reassuring than the red flags suggest, but only if you know how to read them. That is what this explainer is for.

How does a hepatitis A blood test actually work?

A hepatitis A blood test does not look for the virus itself. It looks for the antibodies your immune system builds against it. An antibody is a protein made by white blood cells that locks onto one specific invader; the ones made against the hepatitis A virus are called anti-HAV.

Two types matter clinically. IgM antibodies are the immune system’s first responders: made quickly, present for months, then gone. IgG antibodies arrive a little later and stay for life, which is what gives long-term immunity. The laboratory can measure each separately, or run a total anti-HAV test that detects both together without saying which is which.

The sample is an ordinary blood draw from a vein in the arm, usually a single tube. No fasting is needed for the antibody test, although your care team may combine it with other tests that do require fasting. Results from a hospital laboratory typically return within a day or two, though turnaround depends on where the sample is processed.

Why antibodies rather than the virus? Hepatitis A is shed mainly in stool, and by the time a person feels ill the amount of virus in blood is already falling. A direct test for viral genetic material, called HAV RNA by PCR, exists but is mostly used in reference laboratories and outbreak investigations rather than everyday diagnosis, according to the CDC’s clinical overview. Antibodies, by contrast, are abundant, stable and easy to detect exactly when patients come to attention.

The test answers one question with precision: is there evidence of current or recent hepatitis A infection? It cannot tell you how sick you are. For that, your clinician turns to liver function tests, which we will come to shortly.

The antibody timeline: why the timing of the draw matters

Hepatitis A has a long silent phase. The CDC reports an average incubation period of about 28 days, with a range of roughly 15 to 50 days between swallowing the virus and the first symptoms. During that stretch a person feels well, the liver is not yet inflamed, and an antibody test would come back negative because there is nothing to detect yet.

Then the picture changes quickly. According to the CDC, IgM anti-HAV becomes detectable about 5 to 10 days before symptoms begin, which means that by the time most people are sitting in a clinic with dark urine or jaundice, the IgM test is almost always positive. It stays positive for around six months in most people, sometimes a little longer.

IgG anti-HAV appears early in the illness too, often within the first week or two, and then never leaves. Decades after a childhood infection nobody remembers, a total antibody test will still light up.

This timeline explains three common situations. A person tested very early, perhaps because a household member was diagnosed, may be negative one week and positive the next; clinicians sometimes repeat the test for that reason. A person tested nine months after an illness may have only IgG left, so the lab can confirm past infection but not date it precisely. And a person tested with no symptoms at all may return a puzzling low-level IgM that does not reflect real infection, which is why the CDC advises reserving IgM testing for people who are symptomatic or have a known exposure.

One more piece of timing is practical rather than diagnostic: the CDC notes that peak infectiousness falls in the two weeks before jaundice appears. Most people have already spread the virus, if they were going to, before they know they have it.

IgM, IgG and total antibody results side by side

Laboratory reports rarely explain themselves. The table below summarizes how clinicians usually interpret the main combinations, drawing on the CDC’s clinical guidance. Interpretation always depends on symptoms, exposure history and vaccination status, so treat this as a map rather than a verdict.

IgM anti-HAV	IgG or total anti-HAV	Usual interpretation
Positive	Positive or negative	Current or recent hepatitis A infection, typically within the past six months
Negative	Positive	Past infection or prior vaccination; immunity is considered likely
Negative	Negative	No evidence of infection or immunity; if exposure was very recent, the test may need repeating
Positive (weak)	Negative, no symptoms	Possible false positive; clinicians interpret with caution and may retest

Two clarifications save a lot of worry. First, a positive total antibody test cannot distinguish infection from vaccination, and it cannot say whether the infection was last month or forty years ago. If that distinction matters, the laboratory or clinician will order the IgM specifically.

Second, the hepatitis A vaccine produces IgG. Someone vaccinated in childhood who now has a total anti-HAV positive result has not caught hepatitis A; the test is reporting exactly what the vaccine was designed to do. In the first few weeks after vaccination a transient IgM response can occasionally be detected as well, which is one reason clinicians ask about recent vaccination before interpreting results.

The table is deliberately short because the underlying logic is short. IgM points to now. IgG points to before. Both together say a recent infection is settling into lifelong immunity.

Is hepatitis A IgG positive good news?

Usually, yes. A positive IgG anti-HAV result with a negative IgM is one of the more welcome lines on a lab report. It means your immune system has already met the virus, either through infection or through vaccination, and has left behind the long-lived antibodies that prevent reinfection. The CDC states that IgG anti-HAV persists for life and confers protection against future hepatitis A infection.

People encounter this result in a few different ways. Some are tested before travel or before a new job in food handling or healthcare and learn they are already immune. Some grew up in regions where hepatitis A circulated widely among children and were infected without ever knowing; the CDC notes that about 70 percent of infections in children under six cause no symptoms. Others were vaccinated years ago and simply had not kept the record.

What a positive IgG does not tell you is why. The laboratory cannot separate vaccine-induced antibodies from infection-induced ones, and there is no clinical reason to try. Protection is protection.

Is there any situation where IgG positive is not reassuring? If IgM is also positive, the IgG is part of an active infection, and the IgM is the result that drives decisions. If the person has ongoing symptoms and abnormal liver tests but only IgG is present, the clinician will look for a different cause of the liver inflammation, because past hepatitis A does not cause current disease.

One caveat worth stating plainly: a single positive IgG does not mean every liver symptom for the rest of your life can be waved away. Hepatitis A is one virus among several, and immunity to it says nothing about hepatitis B, hepatitis C, alcohol, medications or fatty liver disease.

What would my ALT be if I had hepatitis A?

Alanine aminotransferase, or ALT, is an enzyme that lives inside liver cells and leaks into the blood when those cells are damaged. It is the number people fixate on, and with reason: in acute hepatitis A it often rises dramatically.

Most laboratories set the upper limit of normal for ALT somewhere in the 40s to mid-50s of units per liter, though the exact range printed on your report depends on the lab and on your sex. In acute viral hepatitis, including hepatitis A, ALT commonly climbs into the hundreds and frequently exceeds 1,000 units per liter, a pattern described in the CDC’s clinical overview. Values ten, twenty or even fifty times the upper limit are not unusual in the first week or two of jaundice.

The companion enzyme is aspartate aminotransferase, or AST, which is also found in muscle and heart tissue. In hepatitis A both rise, but ALT usually rises more than AST, which is one of the clues that points a clinician toward a viral cause rather than, say, alcohol-related injury, where the pattern is often reversed.

Here is the part that surprises people: the height of the ALT peak does not track neatly with how sick you will become. A very high ALT means many liver cells are inflamed, not that the liver is failing. Failure is judged by different tests, chiefly bilirubin and clotting time, covered in the next section.

ALT also falls slowly. Mayo Clinic’s guidance notes that the liver typically heals over weeks to months, and repeat blood tests during that period usually show ALT drifting downward long before it returns to the normal range. A result that is still elevated three weeks in is often part of the expected course; your clinician will interpret the trend rather than any single value.

Reading the rest of the liver panel: bilirubin, ALP, albumin and INR

A liver function panel bundles several measurements, and each answers a slightly different question. MedlinePlus describes the standard set as ALT, AST, alkaline phosphatase, bilirubin, albumin and total protein, often with a clotting test added.

Bilirubin is the yellow pigment left over when old red blood cells are broken down; a healthy liver processes it and sends it into bile. When liver cells are inflamed, bilirubin backs up into the blood and, once it climbs high enough, into the skin and the whites of the eyes. That is jaundice. The CDC notes that jaundice occurs in more than 70 percent of symptomatic adults with hepatitis A, so a raised bilirubin is expected rather than alarming in this setting. What clinicians watch is the direction: bilirubin that keeps rising after the ALT has started to fall deserves a closer look.

Alkaline phosphatase, or ALP, is an enzyme concentrated in the bile ducts. In hepatitis A it is usually only modestly raised. A very high ALP with only mildly raised ALT would push a clinician to consider a blocked bile duct instead of viral hepatitis.

Albumin is a protein the liver manufactures continuously. Because it lasts about three weeks in the bloodstream, it stays normal in a short illness and only falls when liver injury is prolonged. A normal albumin in acute hepatitis A is reassuring and typical.

The prothrombin time, often reported as INR, measures how long blood takes to clot. Clotting factors are made by the liver and turn over within days, so INR is the most sensitive real-time gauge of whether the liver is still doing its job. In the vast majority of hepatitis A cases it stays normal or near normal. A rising INR is one of the findings that prompts closer monitoring, and it is why clinicians sometimes repeat the panel rather than relying on the first draw.

Who is usually tested for hepatitis A, and who is asked to wait

Testing is most useful when it can change a decision, and the CDC’s guidance reflects that. The clearest candidates are people with symptoms consistent with acute hepatitis, such as new jaundice, dark urine, pale stools, nausea, abdominal discomfort under the right ribs, or unexplained fatigue with abnormal liver enzymes. In that setting an IgM anti-HAV test either confirms the cause or rules it out so the search can move on.

Close contacts of a confirmed case form the second group. Household members, sexual partners and people who shared food prepared by the infected person during the infectious window may be tested, particularly if they develop symptoms. Public health teams also test during outbreaks linked to restaurants, shared housing or contaminated produce.

A third group is tested for immunity rather than infection: people planning to work in settings where hepatitis A exposure is likely, people with chronic liver disease for whom a new infection would be more dangerous, and anyone unsure whether they were vaccinated.

Who is usually asked to wait? People with no symptoms and no known exposure. The CDC specifically cautions against IgM anti-HAV testing in asymptomatic people without an exposure history because low-level false positives occur and cause confusion, unnecessary contact tracing and anxiety. Someone who was exposed yesterday is also usually asked to wait, since antibodies take days to develop; the more pressing conversation at that point is about post-exposure prevention, which the CDC notes is time-sensitive and most effective within two weeks of exposure. Whether vaccine, immune globulin or simple observation is appropriate is a decision for the clinician or public health team, who will weigh age, health status and timing.

Children deserve a note. Because most young children have mild or silent infections, they are often identified only when an adult in the household falls ill. Testing them still matters for the household plan, and the blood draw is the same simple procedure.

What happens if your hepatitis A blood test is positive?

A positive IgM result sets several things in motion, most of them outside the exam room.

First, the diagnosis is reported. Hepatitis A is a notifiable disease in the United States, which means the laboratory or clinician informs the local health department. Expect a phone call. The public health worker will ask where you ate, who lives with you, whether you handle food for others and when your symptoms began. This is not an accusation; it is how outbreaks are caught early. The CDC notes that most transmission happens in the two weeks before jaundice, so the contacts who matter are the ones from that window.

Second, your close contacts are offered protection. The health department or your clinician may recommend that household members and others with significant exposure receive post-exposure prophylaxis, meaning vaccine or immune globulin given to prevent illness. That decision, including who qualifies and which option fits, rests with the clinicians involved.

Third, you will likely be asked to stay home. People who work in food service, healthcare or childcare are usually told to remain away until cleared, because the virus continues to be shed in stool for a period after symptoms start.

What does not happen is a prescription for an antiviral drug. There is no specific medicine that treats hepatitis A, and none is needed for most people; the infection is self-limiting and the liver recovers on its own. Mayo Clinic describes management as rest, adequate fluids and nutrition, avoiding alcohol, and reviewing every medication and supplement with your care team, since some are processed by the liver and may be paused during recovery. Never stop or change a prescribed medicine on your own; ask.

Finally, expect a follow-up blood draw. Repeating the liver panel confirms that enzymes are trending down and that clotting remains normal.

What the following days and weeks usually look like

Recovery from hepatitis A is slow, front-loaded with misery, and almost always complete. Knowing the shape of it helps.

The first one to two weeks after diagnosis are usually the worst. Appetite is poor, food smells wrong, and fatigue can be profound. Jaundice, if present, may deepen for several days before it begins to fade. Itching sometimes accompanies the jaundice. Liver enzymes are typically at their peak in this window.

By weeks three to six, most people feel their energy returning in fits and starts. Urine lightens, stools regain color, and the yellow tinge in the eyes recedes. ALT and bilirubin are usually falling steadily on repeat tests, though they may still be above the normal range. The CDC notes that symptoms usually last less than two months.

Not everyone follows the straight line. According to the CDC, 10 to 15 percent of symptomatic people experience prolonged or relapsing illness lasting up to six months, in which symptoms and enzyme levels improve and then flare again. A relapse is alarming to live through but does not usually signal lasting damage, and it does not make the person more likely to develop chronic liver disease.

That last point is the most important thing about hepatitis A recovery: the virus does not establish a chronic infection. Unlike hepatitis B and C, it does not linger for years, does not cause cirrhosis, and does not lead to liver cancer. Once the liver has healed, it has healed.

Practical rhythm during these weeks, drawn from Mayo Clinic’s guidance: rest when tired, eat small meals when larger ones are unappealing, drink enough to keep urine pale, avoid alcohol entirely until your clinician says otherwise, and wash hands thoroughly after using the toilet and before preparing food. Return-to-work timing is a conversation with your care team and, for food handlers, with public health.

What are the first signs of hepatitis A, and why the test beats guessing

Hepatitis A rarely announces itself as a liver problem. The opening act looks like almost any viral illness: tiredness that is hard to shake, a queasy stomach, low fever, aching muscles, loss of interest in food. The NHS notes these early symptoms typically appear a few weeks after exposure. Many people assume a stomach bug and wait it out.

The liver-specific clues arrive a few days later, and they are what usually send people to a clinic. Urine turns the color of strong tea. Stools become pale or clay-colored. The whites of the eyes yellow before the skin does, which is why family members often notice jaundice before the patient. Some describe a dull ache or fullness under the right ribs, where the liver sits. Itching without a rash is common once jaundice sets in.

Here is the difficulty: none of this is unique to hepatitis A. Hepatitis B, hepatitis E, certain medications, gallstones blocking a bile duct, and even severe alcohol use can produce an identical picture. Reading symptoms alone, a clinician cannot tell them apart, and neither can a patient searching online.

This is why the blood test matters more than pattern-matching. A liver panel confirms that the liver is inflamed and roughly how much. The IgM anti-HAV result names the cause. Together they let the care team stop looking for other explanations, make the public health notification that protects contacts, and reassure the patient that this particular hepatitis does not become chronic.

It also cuts the other way. People who feel fine but had a known exposure sometimes assume that absence of symptoms means absence of infection. The CDC’s observation that most young children are asymptomatic, and that adults are infectious before jaundice appears, means a household plan cannot rest on how everyone feels today.

Hepatitis A blood test vs. a full hepatitis panel

Clinicians often do not order a hepatitis A test alone. When someone presents with new jaundice and a sharply raised ALT, the cause could be any of several viruses, and the efficient move is a hepatitis panel: a bundle of tests run from the same tube that checks for hepatitis A, B and C at once. MedlinePlus describes the panel as the standard first step when acute viral hepatitis is suspected.

The components differ in kind. For hepatitis A, the panel includes IgM anti-HAV. For hepatitis B, it includes tests for a viral surface protein called the surface antigen, plus antibodies to the core of the virus. For hepatitis C, it includes an antibody test that, if positive, is followed by a test for viral genetic material to see whether infection is current.

Why does this matter to someone reading a result? Because a panel can return several lines, and the ones that look worrying may be the least important. A positive hepatitis B surface antibody, for example, usually means past vaccination, not infection. A positive hepatitis C antibody may reflect an infection that has already cleared. The IgM anti-HAV line is the one that speaks to the current illness.

The panel also answers a question patients sometimes do not think to ask: is more than one thing going on? People with existing chronic hepatitis B or C who then catch hepatitis A tend to have a rougher course, and the CDC notes that vaccination is recommended for people with chronic liver disease for exactly this reason. Identifying a second infection changes the intensity of monitoring even when it does not change the treatment of the hepatitis A itself.

If your report shows only a hepatitis A test, it usually means the exposure history was clear enough that a panel was not needed. If it shows a full panel, do not read each line in isolation; ask your clinician to walk through them together.

What people often get wrong about hepatitis A test results

Some misunderstandings show up in almost every conversation about these results. Correcting them saves worry and, occasionally, prevents a poor decision.

The first is treating a positive total antibody test as a diagnosis. It is not. Total anti-HAV cannot separate past from present, or infection from vaccination. Without IgM, a positive total result in a well person almost always means immunity, not illness.

The second is reading ALT as a severity score. An ALT in the thousands is frightening on paper but does not by itself indicate liver failure. Clotting time and the trend in bilirubin are the measures that matter for that judgment, and in the overwhelming majority of hepatitis A cases they remain reassuring.

The third is the belief that hepatitis A becomes chronic. It does not. There is no carrier state and no progression to cirrhosis. A relapse in the months after infection, which the CDC reports in 10 to 15 percent of symptomatic people, is a bump in recovery, not a chronic disease.

The fourth is assuming that feeling better means no longer being infectious, or that feeling fine means not infected. The virus is shed before symptoms begin and for a period after they start. Handwashing and staying home from food handling until cleared protect others regardless of how the patient feels.

The fifth is expecting an antiviral prescription. None exists for hepatitis A, and the absence of a specific drug is not a gap in care. The liver heals itself; treatment is about comfort, hydration and avoiding things that add to its workload.

The last is a quieter one: shame. Hepatitis A spreads through contaminated food and water and through close contact, and most people have no idea where they picked it up. A positive test says something about exposure, not about character.

How hepatitis A spreads, and what a positive test means for your household

Understanding transmission makes the public health phone call less mysterious. The hepatitis A virus leaves the body in stool and enters a new host by mouth, a route clinicians call fecal-oral. In practice this means food or water contaminated by an infected person who did not wash their hands well, close household contact, sexual contact that involves the anal area, and, in some settings, shared drug-use equipment. The CDC identifies contaminated food and water and person-to-person contact as the main routes in the United States.

Because the virus is shed before symptoms appear, a household typically has already been exposed by the time one member is diagnosed. That is not cause for alarm, but it is cause for a plan. Public health teams generally identify contacts from the infectious window, which the CDC places from about two weeks before jaundice onset through roughly one week after, and offer post-exposure protection to those who qualify. Whether a given contact receives vaccine, immune globulin or observation is a clinical decision that considers age, health status and how much time has passed since exposure.

Simple measures cut ongoing risk. Thorough handwashing with soap after using the toilet, after changing diapers and before handling food is the single most effective step. The infected person should not prepare food for others until the care team or health department clears them. Separate towels help. Surfaces contaminated with stool should be cleaned with a household disinfectant.

Children in the household are often the hidden link. Because most young children have no symptoms, they can carry the virus through a home or daycare unnoticed. If a child is a contact, the pediatric team will advise on testing or protection; the process for a child is the same simple blood draw, with the usual comfort measures such as distraction and a favorite toy.

Immunity after infection is lifelong, so a household that has been through hepatitis A once does not face it from the same source again.

Questions to ask your care team about your results

A results conversation goes better with a short list in hand. These are the questions clinicians most often find useful to answer, and none of them is too basic.

• Which antibody was positive, IgM or IgG, and what does that combination mean for me specifically?
• Could this result be a false positive, and does anything in my history, such as recent vaccination, make that more likely?
• How high are my ALT and bilirubin compared with my lab’s normal range, and are any of the other panel values, especially clotting time, a concern?
• When will you repeat the liver panel, and what trend are you hoping to see?
• Which of my current medications or supplements should we review while my liver recovers, and how will you let me know if any need to be paused?
• Who in my household or close circle should be contacted, and who will make that contact: your office or the health department?
• When can I return to work, and does my job in food service, healthcare or childcare change that timeline?
• What symptoms during the next few weeks would mean I should call you rather than wait for the scheduled follow-up?
• Do I have any other liver condition that makes this infection riskier for me?
• Once I have recovered, do I need any further testing, or is this closed?

Bring the printed lab report or have the portal open. Write down the answers; recall is unreliable when you are tired and anxious. If a family member joins the visit, they can hold the list while you listen.

The point of these questions is not to second-guess the clinician. It is to leave the room knowing which number you are watching, what a good trend looks like and who is handling the parts that happen outside the clinic. Every decision about testing, protection for contacts and medication changes belongs to the treating team; your job is to understand the plan well enough to follow it.

When to call your doctor

Most people with hepatitis A recover at home with rest and fluids, and the scheduled follow-up is enough. A small number develop complications that need prompt attention. Knowing the signs is the safety net.

Call your clinician the same day, or seek urgent care, if you notice any of the following:

• New confusion, unusual drowsiness, difficulty staying awake, or personality changes noticed by others. Mayo Clinic identifies these as possible signs of acute liver failure, a rare complication that needs hospital assessment.
• Bleeding that is hard to stop, easy bruising, blood in vomit or stool, or black tarry stools, which can indicate the liver is no longer making enough clotting factors.
• Persistent vomiting that prevents you from keeping down fluids, or signs of dehydration such as very little urine, dizziness on standing or a racing heartbeat.
• Jaundice that keeps deepening after the second or third week, or that returns after it had faded.
• Severe or worsening abdominal pain, particularly with fever, or a swollen abdomen.
• Any new symptom in a person who also has chronic liver disease, is pregnant, is over 50, or has a weakened immune system, since the CDC notes these groups carry a higher risk of severe illness.

Call within a day or two, without waiting for the planned visit, if symptoms are simply not improving after a few weeks, if itching is unbearable, or if a household contact develops symptoms and has not yet been assessed.

For most readers this list will never be needed. Hepatitis A is, in the language of the NHS, usually not serious and usually clears up on its own. The red flags exist because the uncommon case deserves to be caught early, and because the person best placed to judge a changing picture is the clinician who has your numbers in front of them.

Frequently asked questions

What happens if you test positive for hepatitis A?

Your clinician confirms the result is IgM, reviews your liver panel, and reports the case to the local health department, which will ask about contacts and exposures. Close contacts may be offered protection. You will likely be told to rest, avoid alcohol, stay home from food handling until cleared, and return for a repeat liver panel to confirm enzymes are trending down.

What would my ALT be if I had hepatitis A?

Often very high. In acute viral hepatitis, ALT commonly reaches the hundreds and frequently exceeds 1,000 units per liter, according to the CDC. That figure reflects how many liver cells are inflamed, not whether the liver is failing. Clinicians judge severity from bilirubin trend and clotting time, and they expect ALT to fall gradually over weeks.

Is hepatitis A IgG positive good?

In most cases, yes. IgG anti-HAV with a negative IgM means you have lasting immunity from past infection or vaccination, and the CDC states this protection is lifelong. The lab cannot tell which source produced it, and there is no clinical need to know. Only when IgM is also positive does IgG form part of a current infection.

What is the hepatitis A IgM antibody test used for?

It confirms a current or recent infection. IgM is the immune system’s first antibody response, detectable shortly before symptoms and for about six months afterward. Because low-level false positives can occur in people with no symptoms, the CDC advises reserving IgM testing for people who are ill or have a known exposure, so results are interpreted in context.

What does a hepatitis A total antibody test show?

It detects IgM and IgG together without distinguishing them. A positive total result means you have encountered the virus or vaccine at some point, so it is mainly useful for checking immunity before travel or certain jobs. It cannot confirm a current infection on its own; if that question matters, a separate IgM test is ordered.

What are the first signs of hepatitis A?

Early illness usually resembles a nonspecific virus: fatigue, nausea, low fever, aching muscles and loss of appetite, appearing a few weeks after exposure according to the NHS. Liver-specific clues such as dark urine, pale stools and yellowing eyes tend to follow days later. Because other conditions look identical, a blood test rather than symptom-matching identifies the cause.

How long after exposure will a hepatitis A blood test be positive?

Usually not until close to symptom onset. The CDC gives an average incubation period of about 28 days, with IgM becoming detectable roughly 5 to 10 days before symptoms. Testing in the first days after exposure often returns negative, so clinicians may repeat the test later or focus instead on timely post-exposure protection for the exposed person.

Do I need to fast before a hepatitis A blood test?

No fasting is needed for the antibody test itself. It is a single venous blood draw. If your clinician bundles it with other tests that require fasting, such as certain metabolic panels, you will be told in advance. Liver function tests included in the same draw do not usually require fasting either, though local lab instructions take precedence.

Can liver function tests alone diagnose hepatitis A?

No. A liver panel shows that the liver is inflamed and roughly how much, through ALT, AST, bilirubin and related values, but an identical pattern can come from hepatitis B or E, medications, gallstones or alcohol. Only the antibody test names hepatitis A specifically. The two are read together: one measures the injury, the other identifies the cause.

How long do abnormal liver results last after hepatitis A?

Weeks to months. Mayo Clinic notes the liver typically heals over that period, and repeat panels usually show ALT and bilirubin falling steadily before returning to normal. The CDC reports that 10 to 15 percent of symptomatic people have prolonged or relapsing illness lasting up to six months, which can include renewed enzyme rises, without progression to chronic liver disease.

References

• CDC: Clinical Overview of Hepatitis A
• MedlinePlus: Hepatitis A
• MedlinePlus: Liver Function Tests
• NHS: Hepatitis A

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.