Kidney Function

Your kidneys filter waste, regulate fluid balance, and help maintain blood pressure. Changes in kidney function often develop silently, without noticeable symptoms in the early stages. This panel measures creatinine, eGFR, and urea to give you direct data on your kidney performance.

This test may be relevant for:

• Men who follow a high-protein diet and want to check their kidney markers
• Those with a family history of kidney-related conditions
• Men using supplements such as creatine who want to monitor kidney function
• Anyone who wants baseline data on kidney health

• Creatinine (umol/l): a waste product from muscle metabolism; the kidneys normally filter it out efficiently
• eGFR (ml/min): an estimated glomerular filtration rate that indicates how well the kidneys are filtering blood
• Urea (BUN) (mmol/l): a byproduct of protein metabolism; elevated levels may suggest the kidneys are not clearing waste as effectively

Creatinine and eGFR work together: elevated creatinine with a lower eGFR may suggest reduced kidney filtration capacity. Urea adds another layer of information, as it reflects both kidney function and protein intake. By evaluating all three markers, you get a more reliable picture than any single value could provide. Deviations may have various causes and do not automatically indicate a problem.

A blood sample is drawn at a certified sample point (afnamepunt). There are over 750 locations throughout the Netherlands. The procedure takes approximately 10 to 15 minutes.

This test may be useful if you follow a high-protein diet, use creatine supplements, have a family history of kidney issues, or simply want to establish baseline values. It can also be relevant if you experience symptoms like changes in urination patterns, unexplained swelling, or persistent fatigue.

Your results will show whether each marker falls within the reference range. An elevated creatinine or urea, or a lower-than-expected eGFR, may warrant further investigation. However, factors such as muscle mass, hydration, and diet can influence these values. A healthcare provider can help you interpret the results in the context of your personal health profile.

Your results are typically available within a few business days. You will receive a clear report showing each marker and its reference range. Consider reviewing your results with a healthcare provider who can provide personalized context and guidance.