Ketones in Urine: What They Mean, Diabetes vs Diet Causes and When to Act Fast

A colleague once fished a folded lab report out of her bag at lunch and pointed at a single line: Ketones: trace. She had skipped breakfast, run six miles the night before, and was two weeks into a low-carb reset. Was this good news or a warning? The honest answer, as with so much in a urine panel, was: it depends entirely on who is holding the report.

Ketones are one of the few lab values that can be a badge of dietary discipline for one person and a flashing red light for another. The same purple square on a test strip can mean a body quietly running on fat stores, or a body in the early hours of a metabolic emergency that sends more than 200,000 Americans to the hospital each year.

Sorting out which story your result is telling takes a little biochemistry, a little context, and a clear sense of when curiosity should give way to a phone call.

What are ketones, and why do they show up in urine?

Your body has two main fuel lines. The first is glucose, drawn from carbohydrates and stored in the liver and muscles as glycogen. The second is fat. When glucose runs short, or when the hormone insulin is too scarce to move glucose into cells, the liver starts breaking fatty acids into small water-soluble molecules that most tissues, including the brain, can burn. Those molecules are ketones.

There are three of them. Acetoacetate and beta-hydroxybutyrate do the heavy lifting as fuel; acetone is a breakdown product that leaves through the lungs, which is why heavy ketosis can give breath a faint nail-polish-remover smell. Under normal circumstances the liver makes ketones in small amounts and the body uses them almost as fast as they appear, so very little spills into the urine.

The kidneys change the picture once ketone production outruns demand. Blood levels climb, the kidneys filter the excess, and the strip you dip into a sample turns color. That is ketonuria: ketones in the urine. The word describes a finding, not a disease. A marathon runner at mile 22, a toddler who has been vomiting all night, and a person whose diabetes has slipped out of control can all produce the same result for very different reasons.

What separates a harmless reading from a dangerous one is not the ketones themselves but what is driving them and whether the blood is becoming acidic. Ketones are weak acids. In small amounts the body buffers them without trouble. In large, unchecked amounts they tip blood chemistry toward acidosis, and that is the point where a metabolic footnote becomes an emergency.

What does ketone in urine indicate? Reading trace, small, moderate and large

Most urine ketone strips and lab dipsticks report results in a rough scale rather than an exact number. The chemistry behind them, a reagent that reacts mainly with acetoacetate, produces a color change graded against a chart. The terms vary slightly by manufacturer, but the tiers line up closely with the concentrations below.

Strip reading	Approximate concentration	What it usually reflects
Negative	Under 5 mg/dL	Normal; the body is not relying on fat for fuel in a measurable way
Trace	About 5 mg/dL	Skipped meals, an overnight fast, a hard workout, early low-carb eating
Small	About 15 mg/dL	Established low-carb diet, prolonged fasting, mild illness with poor intake
Moderate	About 40 mg/dL	Deeper ketosis; in diabetes, a reason to check glucose and call the care team
Large	80 to 160 mg/dL or higher	In diabetes, possible ketoacidosis; in anyone, worth medical evaluation if unwell

Two caveats matter more than the numbers. First, urine lags behind blood. Ketones take hours to accumulate in the bladder, so a strip reflects where your body was earlier in the day, not this minute. Second, the strip does not see beta-hydroxybutyrate, which happens to be the dominant ketone in ketoacidosis. A person can be seriously ill with a strip reading that understates the problem, and, during recovery, the strip can look worse as beta-hydroxybutyrate converts back to acetoacetate even while the patient improves.

So a trace result in a healthy adult who ate dinner at six and gave a sample at eight the next morning is close to meaningless. A moderate result in someone with type 1 diabetes who feels queasy is a different conversation, and the table is only the beginning of it.

Ketonuria without diabetes: fasting, low-carb eating and long workouts

The most common reason a lab flags ketones has nothing to do with diabetes. It has to do with the last time you ate carbohydrates.

The liver stores roughly 100 grams of glycogen, enough to cover about 12 to 24 hours of normal activity. Once that reserve thins, fat breakdown accelerates and ketone output rises. An overnight fast before a blood draw routinely produces trace ketones, and a full day without food can push a healthy adult to small or even moderate readings. Nothing has gone wrong. The body is doing exactly what it evolved to do between meals.

Very low-carbohydrate diets produce the same state on purpose. Cutting intake below about 50 grams of carbohydrate a day, and often below 20 grams in stricter versions, keeps glycogen depleted and ketone production steady. People following these plans frequently use urine strips to confirm they have reached ketosis, and a persistent small-to-moderate reading is the expected signature. Interestingly, the strips become less useful over weeks as the body adapts and burns ketones more efficiently, leaving fewer to spill into urine.

Endurance exercise is the third everyday trigger. A long run, a century ride or a multi-hour hike drains glycogen and raises ketones for several hours afterward, particularly if the workout was done on an empty stomach. Add the concentration effect of sweating, and a post-race urine sample can look surprisingly dark on the ketone square.

In all three situations blood sugar stays normal or runs slightly low, insulin is present and working, and the body keeps ketone levels in a self-limiting range. That combination is the reassuring part, and it is the exact combination that disappears in diabetic ketoacidosis.

What foods cause ketones?

The question is a little backwards, and the correction is worth making. No food creates ketones directly. The absence of one nutrient does: carbohydrate. Ketone production is a response to low insulin and depleted glycogen, and the fastest way to get there through diet is to stop supplying the glucose that keeps insulin up and glycogen full.

That said, certain eating patterns reliably raise ketones. Meals built around meat, fish, eggs, cheese, oils, nuts and non-starchy vegetables, with bread, rice, pasta, potatoes, fruit and sweetened drinks removed, will push most people into measurable ketosis within two to four days. Fats rich in medium-chain triglycerides, found in coconut oil and sold as concentrated supplements, are converted to ketones more readily than other fats and can nudge readings up even when carbohydrate intake is moderate.

Protein complicates things slightly. The body can convert some amino acids into glucose, so a very high-protein, low-fat plan produces less ketosis than a high-fat one at the same carbohydrate level. This is why classic ketogenic diets specify fat as the dominant calorie source rather than simply banning carbs.

Alcohol deserves a separate mention. Heavy drinking, especially combined with poor food intake and vomiting, can produce alcoholic ketoacidosis, a genuinely dangerous condition that shows up as large urine ketones with low or normal blood sugar. It is uncommon, but it is a reminder that ketones plus feeling ill is never a pattern to shrug off just because diabetes is not in the picture.

For someone deliberately following a ketogenic plan, food-driven ketones are the goal. For someone with diabetes, a diet change that raises ketones needs to be discussed with their care team first, because it removes one of the easiest clues that something else is going wrong.

Will dehydration cause ketones in urine?

Yes, though not quite in the way most people assume. Dehydration does two separate things to a ketone test, and only one of them is about ketones.

The first effect is concentration. When you are short on fluid, the kidneys hold water back and the urine becomes darker and denser. Every dissolved substance in that sample, ketones included, is packed into less volume. A person with a mild, harmless level of ketosis who is also dehydrated can register a stronger color on the strip than the same person after two glasses of water. The ketones were there either way; the dehydration made them look more dramatic.

The second effect is real, and it comes through appetite. Dehydration rarely travels alone. It usually arrives with the reasons for it: a stomach bug, a fever, a hangover, a day of travel without meals. Those situations cut food intake, deplete glycogen and genuinely increase ketone production. The strip is then reporting two things at once, a true rise in ketones and a concentrated sample, which is why a sick, dry person can produce a moderate result that startles them.

There is a dangerous version of this loop in diabetes. High blood sugar pulls water into the urine, causing dehydration; dehydration worsens the metabolic stress; ketones climb. In diabetic ketoacidosis, fluid loss can run to several liters, which is why hospital treatment begins with rehydration.

For someone without diabetes, the practical takeaway is simple. If a urine test shows ketones and the sample was dark, drink, eat a normal meal, and, if a repeat test is needed, give a properly hydrated sample. If the ketones persist once you are hydrated and eating, that is worth a conversation with a clinician.

Ketones in urine with diabetes: why the stakes are different

Everything changes when the person holding the strip has diabetes, and the reason comes down to insulin.

In a person without diabetes, ketosis is self-regulating. As ketones rise, the pancreas releases just enough insulin to slow fat breakdown, and levels plateau. The brake is built in. In type 1 diabetes, the pancreas has lost the ability to make insulin, so there is no brake. If insulin delivery is interrupted, whether through missed medication, a kinked pump line, or an illness that sharply increases the body’s needs, fat breakdown accelerates without limit. Ketone production can climb ten- to twentyfold above dietary ketosis within a day.

Type 2 diabetes carries a lower but real risk, particularly during serious illness, surgery or infection. A newer class of glucose-lowering medicines that pushes sugar out through the kidneys has also been linked to ketoacidosis occurring at near-normal blood sugar, which catches people off guard because the classic clue, a very high glucose reading, is missing.

This is why ketones in urine in diabetes are treated as a signal rather than a curiosity. The Centers for Disease Control and Prevention advises checking for ketones whenever blood glucose is over 240 mg/dL, during any illness, or when symptoms such as nausea, vomiting or abdominal pain appear. Moderate or large ketones under those conditions warrant a call to the care team the same day, and exercise should be avoided until the reading falls, because physical activity in that state can push ketones higher rather than lower.

The underlying principle is worth stating plainly: in diabetes, ketones are a measure of how far insulin has fallen behind need. Reading them early buys hours, and hours are what matter.

Nutritional ketosis vs diabetic ketoacidosis: the difference that matters most

These two states share a word root and almost nothing else. Confusing them causes needless panic in one direction and dangerous complacency in the other, so the contrast deserves its own space.

Nutritional ketosis, the kind produced by fasting or a low-carb diet, typically runs blood ketone levels between 0.5 and 3.0 millimoles per liter. Blood sugar is normal or slightly low. Blood pH stays in its normal range because insulin, even at low levels, caps ketone production. People in nutritional ketosis feel, at worst, mildly tired or headachy during the first week, and many feel entirely normal.

Diabetic ketoacidosis usually involves blood ketones above 3.0 millimoles per liter, often far higher, alongside blood sugar frequently above 250 mg/dL and a blood pH that has dropped into acidic territory. The body is not simply burning fat; it is being flooded with acid it cannot clear, while losing fluid and electrolytes through the urine. People in DKA feel unmistakably ill: nauseated, breathless, confused, sometimes doubled over with abdominal pain.

The tell, in other words, is not the ketone strip alone. It is the company the ketones keep. Ketones with normal glucose in a person who feels fine and has been eating low-carb are one thing. Ketones with high glucose, or with vomiting, or with deep rapid breathing, are another thing entirely, and no amount of familiarity with keto diets should make anyone treat the second pattern as benign.

One further point of honesty: a ketogenic diet does not cause DKA in people with normal insulin production. The evidence on that is consistent. What it can do is muddy the water for a person with diabetes, who loses the ability to use urine ketones as a clean early-warning signal. That is a reason for caution and planning, not fear.

What are the warning signs of diabetic ketoacidosis?

Diabetic ketoacidosis tends to unfold over a matter of hours, and the Mayo Clinic notes it can develop within 24 hours. The early phase looks a lot like ordinary high blood sugar. The later phase looks like something is seriously wrong, because it is.

In the first hours, the dominant symptoms are thirst that will not quit and trips to the bathroom that seem constant. Blood sugar is high, the kidneys are dumping glucose and water, and dehydration is setting in. Fatigue and a dull headache are common. A ketone strip at this stage often already reads moderate.

As acid accumulates, the digestive system protests. Nausea, vomiting and abdominal pain, sometimes severe enough to mimic appendicitis, are hallmark features, and vomiting is especially dangerous because it accelerates fluid loss and makes it impossible to keep up with drinking. Breath may take on a fruity or acetone smell as the body exhales ketones.

The body’s next move is to breathe off carbon dioxide to counter the acidity, producing a distinctive pattern of deep, rapid, almost laboring breaths. Confusion, difficulty staying awake and, in advanced cases, loss of consciousness follow as the brain is affected by acidosis and dehydration.

A practical way to think about this progression: thirst and urination mean check; nausea and abdominal pain mean call; rapid breathing, confusion or vomiting that will not stop mean emergency care now. Anyone with diabetes, and anyone who lives with someone who has it, benefits from knowing that ladder by heart, because the person experiencing DKA is often the least able to recognize it in the moment.

The same signs in a person who has never been diagnosed with diabetes still demand urgent evaluation. DKA is, for a meaningful share of people with type 1 diabetes, the way the disease first announces itself.

Why do ketones show up in urine during pregnancy?

Pregnancy makes ketonuria more common and, at the same time, makes it more important to interpret carefully. Both facts are true, and neither should alarm anyone on its own.

The physiology tilts toward ketones for a few reasons. A growing fetus draws steadily on the mother’s glucose, so glycogen runs down faster between meals. Hormonal changes in later pregnancy make cells somewhat less responsive to insulin, which increases fat breakdown. And the nausea of early pregnancy means many women eat little for hours or days at a time. Put those together and a trace-to-small ketone reading at a prenatal visit is one of the more routine findings a clinician sees, particularly in the morning or after a bout of vomiting.

Severe, persistent vomiting is a different matter. When ketones are moderate or large and a woman cannot keep fluids down, clinicians take the finding seriously because it signals dehydration and inadequate intake, and intravenous fluids are sometimes needed. The ketones themselves are a marker of the problem rather than the problem.

Diabetes adds the highest-stakes layer. Women with pre-existing type 1 diabetes can develop ketoacidosis in pregnancy at lower blood sugar levels than they would otherwise, and DKA in pregnancy carries serious risk to the fetus. This is why care teams typically ask pregnant women with diabetes to test ketones at lower glucose thresholds and to call early. Women with gestational diabetes, which develops during pregnancy, are at much lower risk of ketoacidosis but may be asked to check ketones if they are restricting carbohydrates or losing weight.

The through-line is the same one that runs through the whole topic. Ketones plus feeling well and eating normally is reassuring. Ketones plus vomiting, or plus diabetes, or plus feeling unwell, is a phone call.

Ketones in a child's urine: the vomiting-and-fasting loop

Parents are often startled when a pediatric urgent care visit for a stomach bug turns up moderate or even large ketones. In young children this is common, and the explanation lies in a mismatch of size and metabolism.

A toddler’s brain uses a far larger share of total energy than an adult’s, roughly half of resting metabolism, and toddlers carry much smaller glycogen stores relative to that demand. Skip two meals and a small child can burn through reserves that would carry an adult through a full day. Add vomiting, which both prevents eating and causes fluid loss, and ketones rise quickly. Some children are prone enough to this that they develop low blood sugar along with ketones after even a short fast, a pattern pediatricians recognize as a normal variant of childhood metabolism rather than a disease.

The ketones, in turn, often worsen nausea, which prevents eating, which raises ketones further. Breaking that loop with small, frequent sips of fluid that contains some sugar is usually enough, and the strip clears within a day of normal eating.

Where a clinician’s attention sharpens is when ketones appear alongside high blood sugar, unusual thirst, frequent urination or weight loss in a child who has not been diagnosed with diabetes. Type 1 diabetes most often begins in childhood, and a significant proportion of children are already in ketoacidosis at diagnosis because the early symptoms were mistaken for a virus. A child who is breathing fast and deeply, seems confused or unusually sleepy, or has fruity-smelling breath should be seen urgently, whether or not anyone in the family has diabetes.

For most children with a stomach bug, though, the ketone reading is a sign of an empty tank, not a broken engine.

Urine ketones test vs blood ketone meter: which should you trust?

Both tests measure the same underlying process, but they measure it differently, and those differences decide which one belongs in a diabetes sick-day kit.

A urine ketones test is cheap, widely available and requires nothing more than a strip and a sample. Its limitations are structural. Urine collects over hours, so the result reflects the recent past. The reagent reacts mostly with acetoacetate and barely with beta-hydroxybutyrate, the ketone that dominates in ketoacidosis. Strips degrade when exposed to air and moisture, and an expired or poorly stored bottle can read falsely negative. Certain medications and very acidic urine can produce false positives. Dehydration inflates readings. For a healthy person checking whether a low-carb diet has taken hold, none of this matters much. For someone deciding whether to go to an emergency department, all of it does.

A blood ketone meter measures beta-hydroxybutyrate directly from a fingerstick and returns a number in millimoles per liter within seconds. It reflects the present, not the past, and it tracks the ketone that actually causes trouble. Widely used thresholds hold that readings under 0.6 are normal, 0.6 to 1.5 warrant attention and a call to the care team, 1.5 to 3.0 suggest a real risk of ketoacidosis, and above 3.0 call for emergency care. Meters and strips cost more, which is the main reason urine testing persists.

The honest verdict: for anyone with type 1 diabetes, and for anyone with type 2 who has been told they are at risk of ketoacidosis, a blood ketone meter is the better tool and worth asking a care team about. Urine strips remain a reasonable backup and a perfectly good option for the curious low-carb eater. Neither test replaces the most sensitive instrument in the room, which is how the person actually feels.

How do you fix ketones in urine?

The answer splits cleanly along the same line as the cause. Ketones from fasting or diet are fixed by feeding the body glucose. Ketones from insulin deficiency are fixed by restoring insulin, and that is not a do-it-yourself project.

For a person without diabetes, the recipe is almost embarrassingly simple. Eat a normal meal that includes carbohydrate, drink enough fluid to bring urine back to a pale yellow, and give it a few hours. Glycogen refills, insulin rises, fat breakdown slows, and the strip fades to negative, usually within a day. If the ketones came from a stomach bug and eating is not yet possible, sips of a sugar-containing fluid every few minutes do the same job more gently. Someone following a ketogenic diet by choice does not need to fix anything; a persistent small-to-moderate reading is the expected state, though anyone with a medical condition should confirm the plan is appropriate for them.

For a person with diabetes, the approach follows a sick-day plan agreed in advance with their care team, and the details of that plan are theirs to set. The principles are consistent across major guidance: check blood glucose and ketones every few hours, drink water or sugar-free fluids steadily to counter dehydration, do not skip diabetes medication even when not eating, avoid exercise while ketones are moderate or large, and contact the care team promptly rather than waiting to see whether things improve. If vomiting prevents fluids from staying down, or ketones remain moderate or large despite following the plan for a few hours, the right next step is emergency care, where treatment addresses fluid loss, electrolyte shifts and insulin deficiency together under monitoring.

What does not fix ketones: drinking large volumes of plain water alone in diabetes, which dilutes the urine reading without touching the cause, or exercising to burn them off, which can make ketoacidosis worse.

Myths about ketones in urine worth retiring

Ketones attract folklore, partly because the same test serves dieters and patients, and partly because the word ketoacidosis sounds like something a keto diet ought to cause. A few of the most persistent misunderstandings deserve a direct answer.

The first is that any ketones in urine mean diabetes. They do not. In a person with normal blood sugar who has been fasting, exercising or eating low-carb, ketonuria is an expected finding and is not, by itself, a reason to test for diabetes. Clinicians look at ketones together with glucose, and it is the pairing that carries meaning.

The second is the reverse: that a ketogenic diet puts healthy people at risk of ketoacidosis. The evidence does not support this in people whose pancreas produces insulin normally. Insulin acts as a ceiling on ketone production, and nutritional ketosis stays well below the levels seen in DKA. The reasonable cautions about very low-carb eating, such as its effects on cholesterol, kidney stones, nutrient intake and long-term adherence, are real but separate from ketoacidosis.

The third is that darker purple on the strip means faster fat loss. Urine ketones reflect what the body has discarded, not what it has burned. As people adapt to a low-carb diet, they use ketones more efficiently and spill fewer, so strip readings often fade even as ketosis continues. Chasing a darker square is chasing waste, not results.

The fourth is that if the strip is negative, everything is fine. Because urine strips miss beta-hydroxybutyrate and lag behind blood by hours, a negative or trace reading does not rule out early ketoacidosis in a person with diabetes who feels unwell. Symptoms outrank the strip. Every time.

When to see a doctor, and when to act fast

Most ketone findings need no medical attention at all. A trace or small reading in someone who is well, eating normally within a day, and does not have diabetes will resolve on its own, and a routine mention to a clinician at the next visit is plenty.

Make a same-day call to a doctor or care team when ketones are moderate or large and any of the following is true: you have diabetes of any type; you are pregnant; a child has been vomiting or refusing fluids for more than a few hours; the reading persists after a full day of normal eating and drinking; or you have been drinking heavily and eating little. In each case the ketones may be a marker of something that benefits from evaluation, whether dehydration that needs more than oral fluids, an infection, or a diabetes plan that needs adjusting.

Seek emergency care immediately, without waiting to retest, if ketones are present along with any of these: blood glucose above 300 mg/dL that is not coming down; vomiting that prevents keeping fluids down for more than two hours; deep, rapid or labored breathing; fruity-smelling breath; severe abdominal pain; confusion, unusual drowsiness or difficulty staying awake. These are the features of ketoacidosis, and the condition can worsen quickly. It is treatable, and outcomes are far better when treatment starts early.

One more scenario belongs on this list. If someone who has never been diagnosed with diabetes shows ketones alongside intense thirst, constant urination, unexplained weight loss and fatigue, that combination should be evaluated promptly rather than at the next routine appointment. Type 1 diabetes frequently announces itself this way, in children and adults alike, and recognizing the pattern before ketoacidosis develops spares a hospital stay.

The thread through all of it: ketones are information. Read them alongside how you feel, what you have eaten and what your blood sugar is doing, and they will tell you whether to eat a sandwich or pick up the phone.

Frequently asked questions

What does ketone in urine indicate?

Ketones in urine indicate that the body is breaking down fat for fuel because glucose is unavailable or cannot enter cells. In people without diabetes, this usually reflects fasting, low-carb eating, hard exercise, vomiting or pregnancy and is generally harmless. In people with diabetes, moderate or large ketones point to insufficient insulin and, when paired with high blood sugar or nausea, can signal diabetic ketoacidosis.

Will dehydration cause ketones in urine?

Dehydration makes ketones appear higher by concentrating the urine, and the illnesses that cause dehydration, such as vomiting or fever, also reduce food intake and genuinely raise ketone production. So a dry, sick person often shows moderate ketones from both effects together. Rehydrating and eating normally usually clears the reading within a day in someone without diabetes; if it persists, a clinician should take a look.

How do you fix ketones in urine?

Ketones from fasting or diet clear once you eat carbohydrate and rehydrate, typically within a day. Ketones in diabetes require restoring insulin, which means following the sick-day plan agreed with your care team, checking glucose and ketones every few hours, drinking sugar-free fluids, avoiding exercise, and calling promptly. If vomiting prevents fluids or readings stay moderate to large for several hours, emergency care is the right step.

What foods cause ketones?

No food produces ketones directly; the absence of carbohydrate does. Eating patterns built on meat, fish, eggs, cheese, oils and non-starchy vegetables while removing bread, grains, potatoes, fruit and sugary drinks will push most people into ketosis within two to four days, especially below 50 grams of carbohydrate daily. Medium-chain triglyceride fats, such as coconut oil, convert to ketones more readily than other fats.

Is ketonuria the same as ketoacidosis?

No. Ketonuria simply means ketones are present in urine and can occur in perfectly healthy people after a fast or during a low-carb diet. Ketoacidosis is a medical emergency in which ketones accumulate to very high levels and make the blood acidic, almost always because of insulin deficiency in diabetes or, less often, heavy alcohol use with poor intake. Symptoms, blood sugar and blood tests separate the two.

What level of ketones in urine is dangerous?

Large readings, roughly 80 mg/dL and above, are the most concerning, and moderate readings around 40 mg/dL warrant attention in anyone with diabetes. Danger depends on context more than the number: large ketones in a well person on a strict ketogenic diet differ from moderate ketones in someone with type 1 diabetes who is vomiting. Symptoms such as rapid breathing, confusion or persistent vomiting outrank any strip reading.

Can you have ketones in urine without diabetes?

Yes, and it is common. An overnight fast, skipping meals, a long workout, a stomach bug, pregnancy nausea or a low-carbohydrate diet can all produce trace to moderate ketones in people whose blood sugar is normal. Because insulin is present and working, ketone levels stay self-limited and the blood does not become acidic. Ketones alone, with normal glucose, are not a reason to suspect diabetes.

How accurate is a urine ketones test compared with a blood test?

A urine ketones test is a reasonable screening tool but lags blood by several hours, misses beta-hydroxybutyrate, and can be skewed by dehydration, expired strips or certain medications. A blood ketone meter measures beta-hydroxybutyrate directly and reflects the current moment, which is why it is the preferred tool for people with type 1 diabetes managing sick days. For confirming dietary ketosis, urine strips are adequate.

Are ketones in urine during pregnancy normal?

Trace to small ketones are a common finding in pregnancy, particularly in the morning or after nausea, because the fetus draws glucose steadily and many women eat less. Moderate or large ketones with persistent vomiting signal dehydration and inadequate intake that may need treatment. Women with pre-existing diabetes face a higher risk of ketoacidosis in pregnancy and are usually asked to test ketones at lower glucose thresholds.

Should I stop exercising if I have ketones in my urine?

It depends on the cause. In a person without diabetes, post-workout ketones are expected and no reason to stop. In a person with diabetes, exercise with moderate or large ketones and high blood sugar can drive ketone levels higher and is discouraged by major diabetes guidance. Wait until ketones fall to negative or trace and glucose is in range, and check with your care team if unsure.

References

• MedlinePlus: Ketones in Urine
• CDC: Diabetic Ketoacidosis
• NHS: Diabetic ketoacidosis

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.