Kidney Health
Creatinine, eGFR, and BUN: key kidney function markers.
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Biomarkers Included
3 markersA targeted kidney function panel measuring Creatinine, eGFR, and Urea (BUN). These three markers together provide a baseline view of how well your kidneys are filtering waste products from the blood.
Why this test?
The kidneys filter metabolic waste, regulate fluid balance, and support electrolyte homeostasis. Creatinine and Urea are byproducts of normal metabolism that the kidneys clear from the blood. Measuring them, along with the calculated eGFR, can help indicate how effectively the kidneys are performing this function.
Who is this test for?
This test may be relevant for individuals who consume high-protein diets, use creatine supplementation, or want to establish a baseline for kidney function. It can also be useful for those whose healthcare provider has recommended monitoring renal parameters.
What is tested?
- Creatinine: a waste product from muscle metabolism; elevated levels may suggest reduced kidney filtration.
- eGFR (estimated Glomerular Filtration Rate): a calculated value that estimates how much blood the kidneys filter per minute; derived from creatinine, age, and sex.
- Urea (BUN): a waste product from protein metabolism; levels can be influenced by protein intake and hydration status.
What can this test tell you?
The results may indicate whether kidney filtration is within expected ranges. Elevated creatinine or urea, or a lower-than-expected eGFR, could suggest that the kidneys are working harder than usual. However, these values can also be influenced by muscle mass, protein intake, and hydration, so context matters.
How is the sample collected?
A blood sample is drawn at a certified sample point (afnamepunt). There are over 750 locations across the Netherlands. After placing your order, you can select a location and time that works for you.
When is this test useful?
This test may be useful when you want a focused look at renal function, for example if you are following a high-protein nutrition plan, using creatine, or simply want to establish a baseline for future comparison.
What do the results mean?
Results are presented with reference ranges. Keep in mind that creatinine levels can be naturally higher in individuals with greater muscle mass, and urea can rise with high protein intake. A healthcare provider can help determine whether any values warrant further investigation in the context of your diet and training.
What happens after the results?
Your results are available in your personal dashboard. If any values fall outside the reference range, or if you have questions about what the results mean in the context of your lifestyle, discussing them with a healthcare provider is recommended.
From order to report in 4 steps
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Choose your markers
Pick a performance panel or build your own test. Testosterone, CRP, ferritin, thyroid. You choose what gets measured.
Receive your lab referral
Within 2-3 hours you'll receive an email from ZorgDomein with a barcode. Orders outside business hours are processed the next business day.
Get tested at a lab near you
Show the barcode on your phone and bring a valid ID. Done in under 15 minutes.
Receive your report from the doctor
A BIG-registered physician assesses your results and writes a personal report. On your dashboard within a few business days.
Choose your markers
Pick a performance panel or build your own test. Testosterone, CRP, ferritin, thyroid. You choose what gets measured.
Receive your lab referral
Within 2-3 hours you'll receive an email from ZorgDomein with a barcode. Orders outside business hours are processed the next business day.
Get tested at a lab near you
Show the barcode on your phone and bring a valid ID. Done in under 15 minutes.
Receive your report from the doctor
A BIG-registered physician assesses your results and writes a personal report. On your dashboard within a few business days.
Always a location near you
With more than 650+ certified phlebotomy points across the Netherlands.
What's Included
This panel covers 3 biomarkers related to your training, recovery, and overall health.
BUN (blood urea nitrogen) measures the amount of urea nitrogen in your blood, a waste product formed when the body breaks down protein. It is primarily used to evaluate kidney function and can be influenced by diet, hydration status, and liver health.
Learn moreCreatinine is a waste product generated by normal muscle metabolism that is filtered out of the blood by the kidneys. It is widely regarded as the gold standard marker for evaluating kidney function, as consistent production makes it a reliable indicator of filtration efficiency.
Learn moreeGFR (estimated glomerular filtration rate) is a calculated measure of how effectively your kidneys filter waste from the blood. It is the gold standard for diagnosing and staging chronic kidney disease and is derived from blood creatinine or cystatin C levels along with demographic factors.
Learn moreUrea (BUN)
KidneyBUN (blood urea nitrogen) measures the amount of urea nitrogen in your blood, a waste product formed when the body breaks down protein. It is primarily used to evaluate kidney function and can be influenced by diet, hydration status, and liver health.
BUN is a valuable marker for assessing how effectively your kidneys are filtering waste from your blood. Elevated levels may indicate that the kidneys are not functioning optimally, which can be associated with dehydration, kidney disease, or other underlying conditions. Monitoring BUN alongside other kidney markers such as creatinine and eGFR provides a more comprehensive picture of renal health and helps detect potential problems early.
Creatinine
KidneyCreatinine is a waste product generated by normal muscle metabolism that is filtered out of the blood by the kidneys. It is widely regarded as the gold standard marker for evaluating kidney function, as consistent production makes it a reliable indicator of filtration efficiency.
Creatinine is central to assessing kidney health. It is used to calculate the estimated glomerular filtration rate (eGFR), which is the primary measure for staging chronic kidney disease. Early detection of rising creatinine levels can prompt timely intervention, helping to slow the progression of kidney damage. Monitoring creatinine is also important for adjusting medication dosages, as many drugs are cleared by the kidneys.
eGFR (Estimated Glomerular Filtration Rate)
KidneyeGFR (estimated glomerular filtration rate) is a calculated measure of how effectively your kidneys filter waste from the blood. It is the gold standard for diagnosing and staging chronic kidney disease and is derived from blood creatinine or cystatin C levels along with demographic factors.
eGFR is the most important single measure for assessing overall kidney function. It is used internationally to diagnose chronic kidney disease, determine its stage, and guide treatment decisions. Regular eGFR monitoring allows early detection of kidney function decline, often before symptoms appear. This is critical because early intervention can significantly slow the progression of kidney disease and reduce the risk of complications such as cardiovascular disease.
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