Which Tests Track Pediatric Chronic Kidney Disease? Blood, Urine, Blood Pressure and Growth

The folder on the parent’s lap is thicker than it was a year ago. Inside are lab printouts, a growth chart with a line that has quietly flattened, and a page of blood pressure readings written in three different pens. Her son, seven, is kicking the leg of the waiting room chair, bored and entirely well as far as he can tell. That gap, between how a child feels and what the numbers say, is exactly why tests for kidney disease in children matter so much.

Kidneys are quiet organs. A child can lose a large share of filtering capacity before anything hurts, itches or looks wrong. So clinicians rely on a small set of measurements, repeated over months and years, to see the trend a single day’s appearance cannot show.

This explainer walks through what each of those measurements actually captures, why growth and blood pressure sit alongside blood and urine, how often things are usually rechecked, and what parents commonly misunderstand along the way.

How do tests for kidney disease in children fit together?

No single test diagnoses or tracks chronic kidney disease. The picture is assembled from four streams of information that check one another. Blood tests estimate how much filtering the kidneys are doing and whether the downstream jobs of the kidney (balancing salts, making hormones, clearing acid) are being kept up. Urine tests show whether the filters are leaking protein or blood. Blood pressure reflects both a cause and a consequence of kidney strain. Growth is the slowest-moving signal but, in a child, one of the most revealing.

Chronic kidney disease (CKD) means kidney damage or reduced filtering function that persists for more than three months, according to the definition used by the NIH’s kidney institute and echoed by Mayo Clinic. That three-month rule is why a first abnormal result almost always leads to a repeat test rather than a label.

Measurement	What it captures	Why it is useful in a child
Serum creatinine and cystatin C	Waste products the kidneys should clear	Feed the eGFR calculation; cystatin C is less affected by muscle mass
Estimated GFR	Filtering rate, calculated from creatinine and height	Defines stage and shows the long-term trend
Urine protein or albumin to creatinine ratio	Filter leakiness	Early marker of damage; tracks response to treatment
Dipstick and microscopy	Blood, protein, infection, casts	Cheap, quick, points toward a cause
Electrolytes, bicarbonate, hemoglobin, calcium, phosphate, PTH	Kidney housekeeping functions	Detect acidosis, anemia and bone-mineral problems that stunt growth
Blood pressure by percentile	Vascular strain	Both driver and marker of progression
Height, weight, growth velocity	Whole-body effect of CKD	A flattening curve can precede symptoms
Ultrasound and other imaging	Structure and drainage	Finds congenital anomalies, scarring, obstruction

The rest of this article takes each row in turn.

Which kidney function test for a child comes first: creatinine, cystatin C or eGFR?

Usually creatinine. Creatinine is a waste product released steadily by muscle and cleared almost entirely by the kidneys, so a rising blood level suggests the filters are clearing less. MedlinePlus describes it as one of the most common kidney tests in any age group. The catch in pediatrics is muscle. A slight three-year-old carries far less muscle than a teenage athlete, so her normal creatinine is much lower, and a small absolute rise can represent a large drop in function. A value that reads as unremarkable on an adult reference range can be genuinely abnormal for a small child.

Cystatin C is a second marker that helps with this problem. It is a small protein produced by nearly every cell in the body at a fairly constant rate, and it is filtered by the kidney rather than secreted from muscle. Because it does not depend on muscle mass, it is often added when a child is very small, very muscular, malnourished or has a condition that affects body composition. Many pediatric nephrology teams use both markers together to sharpen the estimate.

Neither number is used on its own. Both are fed into an estimated glomerular filtration rate, or eGFR, which converts the raw lab value into a filtering rate the team can stage and follow over time. That calculation is the subject of the next section.

One practical note for the day of the draw: creatinine is not meaningfully affected by a recent meal, so children rarely need to fast for kidney blood work unless other tests are being bundled in. Hydration matters more than food. A child who arrives dehydrated after a stomach bug may show a temporarily higher creatinine, which is one reason teams look at the trend rather than any single visit.

What is a normal GFR in children, and how is it staged?

Glomerular filtration rate, or GFR, is the volume of blood the kidneys’ filters (the glomeruli) clean each minute, expressed per standard body surface area so that children of different sizes can be compared. Measuring it directly involves infusing a tracer and timing its clearance, which is done in specialist situations. Day to day, it is estimated from creatinine, and in children the standard formula uses height because height tracks muscle mass better than age alone.

Adult-style staging, described by Mayo Clinic and the NHS, divides function into ranges: roughly 90 or above is stage 1 (normal filtering, but with other evidence of kidney damage), 60–89 is stage 2, 45–59 and 30–44 are stages 3a and 3b, 15–29 is stage 4, and below 15 is stage 5, when the kidneys can no longer sustain the body without dialysis or transplant. The unit is milliliters per minute per 1.73 square meters.

Here pediatrics adds an honest caveat. Kidneys are still maturing in the first two years of life, and GFR rises steadily through infancy before reaching adult-equivalent values. Standard stage cut-offs are therefore not applied to children under two; the NIH’s kidney institute notes that specialists interpret infant results against age-specific expectations instead. A number that would be labelled stage 3 in a ten-year-old may be entirely expected in a four-month-old.

What the team watches most is direction. A stable eGFR across several visits is reassuring even if it sits below the normal range. A steady decline, even from a reassuring starting point, prompts a closer look at blood pressure, urine protein and possible reversible contributors such as obstruction or medication effects. The stage tells you where the child is; the slope tells you where things are heading.

Which other blood tests matter beyond filtering?

Filtering is only one of the kidney’s jobs. The others are the reason a blood panel for a child with CKD runs longer than a simple creatinine, and each item corresponds to something that can quietly hold back a growing body.

Electrolytes, particularly sodium and potassium, show whether the kidney is balancing salts. Potassium can climb when filtering falls, and a high level affects heart rhythm, so it is checked at nearly every visit. Bicarbonate reflects acid-base balance. Struggling kidneys clear less acid, and chronic mild acidosis is a recognized cause of poor growth and bone weakening in children, which is why teams treat it when they find it.

Hemoglobin picks up anemia. Healthy kidneys release erythropoietin, the hormone that signals bone marrow to make red cells; as kidney tissue is lost, that signal weakens. Iron studies (ferritin and transferrin saturation) are usually checked alongside, because iron deficiency is common and correctable. A tired, pale child with CKD is not simply tired.

Calcium, phosphate, parathyroid hormone (PTH) and vitamin D form the bone-mineral group. Kidneys activate vitamin D and excrete phosphate. When they falter, phosphate rises, active vitamin D falls, calcium drifts down and the parathyroid glands overwork to compensate. Left unchecked, this pattern weakens bones and contributes to short stature. Cleveland Clinic lists these as routine monitoring items in CKD.

Albumin, a blood protein, is often included because low levels can indicate heavy urinary protein loss or poor nutrition. Fasting lipids and glucose may be added periodically, since CKD raises long-term cardiovascular risk. Which of these are drawn at which visit depends on stage and cause; the treating team sets that schedule and adjusts it as results change.

What does a urine test show about a child's kidneys?

Urine is the kidney’s own progress report, and it often changes before blood tests do. Two questions dominate: is protein leaking, and is blood present?

Protein first. Healthy filters keep almost all protein in the bloodstream. Damaged filters let some through. Rather than collecting urine for 24 hours, which is impractical for most children, teams measure the ratio of protein (or specifically albumin) to creatinine in a single sample. The creatinine corrects for how dilute or concentrated the urine is, so a first-thing-in-the-morning sample and an afternoon sample become comparable. MedlinePlus describes this albumin-to-creatinine ratio as a standard early marker of kidney damage. Albumin is the specific protein most often measured; total protein is used when other proteins, as in some tubular disorders, are suspected.

The first-morning sample matters for a pediatric reason. Many healthy older children and teenagers show small amounts of protein after standing and moving around all day, a benign pattern called orthostatic proteinuria. Testing the first urine of the morning, produced while lying flat overnight, separates that harmless pattern from true, persistent leakage. Vigorous exercise and fever can also raise protein temporarily, so teams prefer to confirm on a repeat sample on an ordinary day.

Blood next. A dipstick detects red cells; microscopy confirms them and looks at their shape, which hints at whether they come from the filters or from lower in the urinary tract. Microscopy also finds casts, which are tiny tube-shaped clumps formed inside the kidney, and white cells that suggest infection. Recurrent urinary infections in young children deserve attention because scarring from repeated infection is one route to CKD.

Dipsticks are quick and inexpensive, but they are screening tools; a positive result leads to a laboratory ratio and microscopy, not straight to a diagnosis.

Why is blood pressure counted as a kidney test?

Because the relationship runs in both directions. Kidneys help set blood pressure by managing salt and fluid and by releasing hormones that tighten or relax blood vessels; damaged kidneys tend to push pressure up. High pressure, in turn, forces blood through delicate filters at greater force and speeds their loss. In a child with CKD, blood pressure control is one of the few levers that has been shown in guideline literature to slow progression, which is why it is measured at every single visit.

Children are not small adults here. A reading of 118 over 76 means nothing on its own until you know the child’s age, sex and height. Pediatric guidelines define hypertension in children under 13 as readings at or above the 95th percentile for age, sex and height, with adolescents 13 and older assessed against adult thresholds. So a nurse will plot the reading against a percentile chart, not compare it to the numbers on a parent’s home monitor.

Technique matters as much as the number. The cuff must match the size of the child’s upper arm; a cuff that is too small reads falsely high, a common source of alarm. The child should have been sitting quietly for a few minutes, feet supported, arm at heart level, not just carried in from the parking lot. An anxious first reading is often repeated.

When clinic readings are borderline or inconsistent, teams may use ambulatory blood pressure monitoring: a small cuff worn for 24 hours that records automatically, including overnight. Night-time pressure that fails to dip is a pattern seen more often in kidney disease and is missed entirely by clinic checks. Home monitoring with a validated upper-arm device and a correctly sized cuff can also help, if the team recommends it and shows the family how.

Why the growth chart is a kidney test in disguise

Ask a pediatric nephrologist which single measurement she would keep if she could keep only one, and height often comes up. Growth summarizes everything: nutrition, acid balance, bone-mineral health, anemia, hormone signalling and the sheer energy cost of chronic illness. When several of those are slightly off, the growth line bends before any one lab value looks dramatic.

At each visit, height and weight are measured with care (shoes off, standing tall, the same stadiometer where possible) and plotted on a standard growth chart. For children under two, head circumference and length are measured too. The team looks at percentile position, but even more at growth velocity, which is the rate of height gain over time. A child who has always tracked along the 25th percentile is fine. A child who drifts from the 50th to the 10th over 18 months has a problem to explain, whatever her lab work says.

Why does CKD slow growth? Several mechanisms stack. Chronic acidosis interferes with bone building. Disturbed vitamin D, phosphate and parathyroid hormone weaken the growth plates. Anemia reduces exercise capacity and appetite. Kidney disease also blunts the body’s response to growth hormone, so a child may make normal amounts of the hormone yet grow poorly. The NIH’s kidney institute notes that many children with CKD are shorter than peers and that growth is a routine monitoring target.

Body mass index is plotted as well, since both undernutrition and excess weight complicate kidney care. Puberty timing is recorded, because delayed puberty is another downstream effect. Where growth falters despite correction of nutrition, acidosis and minerals, teams may discuss recombinant growth hormone, which works by boosting the growth signal the kidney disease has dampened. Whether it is appropriate is a decision for the treating team, weighing the individual child.

Do children with kidney disease need imaging or a kidney biopsy?

Blood, urine, pressure and growth tell the team how the kidneys are functioning. Imaging and, less often, biopsy tell them why.

Ultrasound is almost always the first picture. It uses sound waves, involves no radiation and needs no sedation for most children. It shows kidney size, shape, position, and whether urine is backing up (hydronephrosis). In younger children, the most common causes of CKD are congenital anomalies of the kidneys and urinary tract, which the NIH’s kidney institute lists ahead of acquired diseases in this age group; ultrasound finds many of them, sometimes even before birth. Small, bright or scarred kidneys on ultrasound point toward long-standing damage.

Other imaging is added for specific questions. A voiding cystourethrogram uses contrast and X-ray to see whether urine flows backward from the bladder toward the kidneys, a condition called vesicoureteral reflux. A DMSA scan uses a tiny amount of radioactive tracer to map scarring within the kidney tissue. A MAG3 scan tracks how well each kidney drains, which helps decide whether a narrowing needs surgical attention. Each carries a small radiation exposure, so they are ordered when the answer will change management, not routinely.

A kidney biopsy takes a sliver of tissue with a needle for microscopic examination. In children it is usually done under sedation or general anesthesia, guided by ultrasound, and is followed by several hours of monitored rest because bleeding is the main risk. Teams consider it when a glomerular disease is suspected, when protein leakage is heavy or persistent without an obvious cause, or when knowing the exact diagnosis would direct treatment. Mayo Clinic describes it as a test chosen selectively rather than universally. Many children with CKD from structural causes never need one.

Who is usually tested, and who is usually asked to wait?

Routine kidney screening of every healthy child is not recommended by mainstream guidelines. Dipsticking the whole school population produces many false alarms and finds very little disease, so testing is targeted at children with a reason.

Those reasons cluster into a few groups. Structural risk: children whose prenatal scans showed kidney or urinary tract abnormalities, those born with a single kidney, and those with conditions such as spina bifida that affect bladder emptying. Infection and injury history: recurrent urinary tract infections, especially with fever in infancy, or an episode of acute kidney injury during a neonatal intensive care stay or a serious illness. Systemic disease: type 1 diabetes, lupus, vasculitis, sickle cell disease and long-standing high blood pressure. Family history: inherited conditions such as polycystic kidney disease or Alport syndrome, where testing a child may begin early even without symptoms. Prematurity and very low birth weight are also recognized risk factors because the kidneys form their filters in the final weeks of pregnancy.

Children already living with CKD are, of course, the main group tracked with the full panel described here, at intervals set by stage and cause.

Who is asked to wait? Children who are otherwise healthy with one isolated finding are often rechecked rather than worked up immediately. A single trace of protein on a dipstick during a viral illness, blood in the urine after a hard soccer match, or a mildly raised creatinine after vomiting for two days are all situations where a repeat on a normal day, sometimes with a first-morning sample, is the sensible next step. Waiting here is not neglect; it is how the three-month persistence rule is applied in practice. If the repeat is normal and the child has no risk factors, most teams stop there.

How often are tests for kidney disease in children repeated, and what do the weeks between look like?

There is no universal calendar. The rhythm is set by stage, cause and how stable recent results have been. As a broad pattern described in NIH and Mayo Clinic guidance, children with early-stage disease and stable numbers may be reviewed roughly once a year, while those with more advanced disease, active protein leakage, high blood pressure or falling growth are seen every few months, and children approaching stage 5 more often still. The treating team sets and revises that schedule; it is not fixed.

A typical monitoring visit unfolds in a predictable order. Height, weight and blood pressure come first, before any needle, so the readings are not skewed by distress. Urine is collected, ideally a first-morning sample brought from home in a labelled container the clinic has provided. Then the blood draw. Then the consultation, sometimes with results from the same morning, sometimes with results that arrive over the following days.

After a first abnormal result, the weeks that follow are usually about confirmation. A repeat blood test and a repeat urine ratio, spaced out and timed on an ordinary healthy day, tell the team whether the finding is persistent. If it is, an ultrasound is commonly arranged and a referral to a pediatric nephrologist follows. Families often describe this stretch as the hardest part because there is uncertainty without yet a plan.

Between visits, life is mostly ordinary. Children attend school, play sport and eat with the family unless the team has advised specific limits on salt, potassium or phosphate. Teams generally ask that any new medicine, including over-the-counter products and supplements, be checked with them first, because some are cleared by the kidney or can strain it. A vomiting illness deserves an earlier phone call than it would in a child without CKD, since dehydration hits impaired kidneys harder.

How to check kidney health in kids at home between visits

Parents ask this constantly, and the honest answer is that home cannot replace the lab, but it can add useful signal if the team wants it.

Blood pressure is the most valuable home measurement, when a child has known hypertension or CKD and the team has asked for it. A validated upper-arm monitor, a cuff sized for the child’s arm, a few quiet minutes seated, and readings at the same times of day give the clinic a picture that a single stressed reading in an exam room cannot. Write down the numbers rather than trusting memory, and bring the device to a visit once so it can be checked against the clinic’s.

Urine dipsticks at home are used in a narrow situation: children with nephrotic syndrome, a condition where the filters leak large amounts of protein, whose families are taught to test the first-morning urine to catch relapses early. Outside that context, home dipsticks generate anxiety more than information, and teams generally do not recommend them.

A simple diary is more helpful than any gadget. Note how often the child urinates, whether the urine is unusually dark, pink or foamy, any puffiness around the eyes on waking or in the legs by evening, appetite, energy and headaches. Record height at home every few months on a wall chart; it will not match the clinic’s precision, but a sudden slowdown is visible even so.

What home checking cannot do is reassure you that the kidneys are fine. Early CKD is silent. A child who looks well, passes normal-looking urine and has a normal home blood pressure can still have a falling eGFR. That is not a reason for alarm; it is the reason scheduled visits exist. Use home observations to feed the team, not to decide whether to keep the appointment.

What people often get wrong about kidney tests in children

“The urine looked normal, so the kidneys are fine.” Urine color and clarity say almost nothing about filtering function. Protein in amounts that matter is invisible, and a reduced eGFR produces urine that looks entirely ordinary. Only the lab can see the difference.

“One high creatinine means chronic kidney disease.” It does not. Dehydration, a recent illness and certain medicines can push creatinine up temporarily. CKD requires the abnormality to persist for more than three months, which is why repeat testing is standard rather than a sign that the first result was mishandled.

“A normal creatinine means normal kidneys.” In a small child with little muscle, creatinine can sit in the reference range while function is meaningfully reduced. This is exactly why pediatric teams calculate eGFR with height and often add cystatin C.

“There are three early warning signs to watch for.” No validated triad exists. Lists circulating online usually mix late features (swelling, poor appetite, fatigue) with nonspecific ones that most children have for other reasons. Early CKD is typically found through testing of at-risk children, not by symptom spotting.

“Blood pressure only matters in adults.” Pediatric hypertension is real, is defined by percentiles, and is one of the strongest drivers of CKD progression in children. It is also frequently a cuff-size error, so ask for a repeat with the right cuff before worrying.

“Protein after sports means disease.” Exercise, fever and standing all day can produce transient protein. A first-morning sample on a rest day usually settles the question.

“Drinking lots of water will fix the numbers.” Adequate hydration prevents artificially high creatinine, but no volume of water restores lost filtering tissue. Excess fluid can be a problem in advanced disease.

“Short stature is just genetics.” Sometimes. But in a child with kidney risk factors, a bending growth curve is a signal that deserves the full panel, not a shrug.

Questions to ask your care team about your child's kidney tests

Appointments are short and the folder is thick. A written list helps, and the team will welcome it. These are the questions that tend to unlock the most useful conversation.

• What is my child’s current eGFR, how was it calculated, and how has it moved since the last visit?
• Are we using creatinine alone or cystatin C as well, and why?
• What does the urine protein or albumin ratio show, and is it rising, stable or falling?
• Which blood pressure percentile is my child at, and was the cuff sized correctly?
• Should we be measuring blood pressure at home, and if so, which device and how often?
• Where does my child sit on the growth chart, and has growth velocity changed?
• Are the bicarbonate, hemoglobin, calcium, phosphate and PTH values in the range you want, and if not, what is the plan?
• Do we know the cause of the kidney disease, and is any further imaging or a biopsy being considered?
• How often will each test be repeated, and what result would make you bring the next visit forward?
• Which over-the-counter medicines, supplements or sports drinks should we avoid or check with you first?
• Are there dietary limits right now, or is a normal family diet fine at this stage?
• What should we do when my child has a vomiting or diarrheal illness?
• Who do we call out of hours, and which signs should send us to emergency care?
• Is there anything about school, sport or travel we should plan around?

Ask for a copy of the results each time. Over a few years, a parent who keeps the trend in one place often notices a shift before anyone else does, and that observation is worth bringing to the room.

When to call your doctor: red-flag signs in a child with kidney disease

Most of the time, CKD in childhood is managed through scheduled visits, and the numbers move slowly. Some situations should not wait for the next appointment.

Call your child’s team the same day for new or worsening puffiness around the eyes on waking or swelling of the legs, feet or abdomen; urine that is pink, red or cola-colored, or looks persistently foamy; a marked drop in how often the child urinates, or very dark, scant urine; a fever with pain in the side or back, or with burning on urination; vomiting or diarrhea lasting more than a day in a child with known CKD, because dehydration can tip impaired kidneys quickly; or home blood pressure readings well above the range the team gave you.

Seek emergency care immediately, by calling emergency services, for a severe headache with vomiting, blurred vision, confusion or a seizure (these can signal dangerously high blood pressure); breathlessness, difficulty lying flat or chest pain, which can reflect fluid overload; extreme drowsiness, floppiness or a child who cannot be roused normally; no urine passed for many hours in a young child who is also unwell; or a racing, irregular or very slow heartbeat, which can accompany a high potassium level.

For children who have not been diagnosed but have risk factors, the same signs, plus a growth curve that has flattened or bedwetting that returns after years of dry nights, are reasons to book a visit and ask directly about kidney testing. The NHS and MedlinePlus both note that early CKD rarely announces itself, so the threshold for a conversation should be low.

None of these signs confirms a problem, and their absence does not rule one out. They are the moments to hand the decision to the treating team, who know the child’s baseline and can act on it.

Frequently asked questions

What are the signs of kidney problems in kids?

Early kidney disease in children usually causes no signs at all, which is why testing is targeted at children with risk factors. When features do appear, they can include puffiness around the eyes or legs, pink or foamy urine, a return of bedwetting, poor appetite, tiredness, high blood pressure or slowed growth. None of these confirms kidney disease; they are prompts for a clinician to order blood and urine tests.

What are the three early warning signs of kidney disease in children?

There is no validated set of three early warning signs. Lists circulating online typically mix later features such as swelling and fatigue with nonspecific ones like tiredness that most children experience for other reasons. Early chronic kidney disease is usually silent and is found through blood, urine and blood pressure testing in children who have a known risk factor, not through symptom spotting.

How to check kidney health in kids?

A clinician checks kidney health with a blood test for creatinine (often with cystatin C) to estimate the filtering rate, a urine test for protein or albumin and blood, a blood pressure reading plotted against age, sex and height percentiles, and height and weight on a growth chart. At home, parents can keep a diary of urine changes, swelling and energy, and measure blood pressure if the team asks.

What is a kidney function test for a child?

It is a blood test measuring creatinine, and sometimes cystatin C, that is combined with the child’s height to calculate an estimated glomerular filtration rate, or eGFR, which is how much blood the kidneys filter per minute. It is usually paired with a urine protein-to-creatinine ratio. Children do not normally need to fast, but good hydration on the day gives a more reliable result.

What is a normal GFR in children?

In children older than two, an eGFR of 90 or above is considered normal filtering, with lower ranges defining stages 2 through 5. Infants and toddlers have naturally lower values because their kidneys are still maturing, so standard stage cut-offs are not applied under age two. The trend across visits matters more than any single number, and the treating team interprets it against the child’s age.

Why does the clinic want a first-morning urine sample?

Because many healthy older children show small amounts of protein in urine after standing and moving around all day, a harmless pattern called orthostatic proteinuria. Urine produced while lying flat overnight avoids this effect, so a first-morning sample distinguishes true, persistent protein leakage from a benign finding. Exercise and fever can also raise protein temporarily, which is why repeats on an ordinary day are common.

Why is blood pressure measured at every kidney visit?

Damaged kidneys tend to raise blood pressure, and high pressure in turn speeds the loss of kidney filters, so it is both a marker and a driver of progression. In children under 13, hypertension is defined by percentiles for age, sex and height rather than fixed numbers. Correct cuff size and a few minutes of quiet sitting are essential, and borderline readings are often confirmed with 24-hour monitoring.

Why do they measure my child's height if the problem is the kidneys?

Growth summarizes the whole-body effects of kidney disease: acid buildup, disturbed calcium, phosphate and vitamin D, anemia, and a blunted response to growth hormone all slow height gain. A flattening growth curve can appear before any single lab value looks dramatic. Teams track growth velocity, the rate of height gain over time, as a routine monitoring target in pediatric chronic kidney disease.

How often are kidney tests repeated in children with CKD?

The schedule depends on stage, cause and stability. Children with early-stage disease and steady results may be reviewed around once a year, while those with advanced disease, heavy protein leakage, high blood pressure or faltering growth are seen every few months. After a first abnormal result, repeats are spaced to confirm whether the finding persists beyond three months. The treating team sets and adjusts the interval.

Is a kidney biopsy always needed to diagnose kidney disease in a child?

No. Many children with chronic kidney disease from congenital or structural causes are diagnosed with ultrasound, blood and urine tests alone. A biopsy, which removes a small tissue sample with a needle under sedation and ultrasound guidance, is considered when a disease of the filters is suspected or when knowing the precise cause would change treatment. Bleeding is the main risk, so children are monitored for several hours afterward.

References

• Kidney Disease in Children (NIH, National Institute of Diabetes and Digestive and Kidney Diseases)
• Chronic kidney disease: Diagnosis (NHS)
• Creatinine Test (MedlinePlus)
• Chronic Kidney Disease (Cleveland Clinic)

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.