Kidney Function

The kidneys filter waste products from the blood, regulate fluid balance, and help control blood pressure. Changes in kidney function can develop gradually and may not cause symptoms until they are more advanced. Measuring kidney markers can provide early data about how the kidneys are performing.

This test may be relevant for women who:

• Want to check kidney function as part of a health assessment
• Take medications that may affect the kidneys
• Have a family history of kidney disease
• Experience symptoms such as changes in urination, swelling, or fatigue

This panel measures three markers:

• 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 well the kidneys are filtering; based on creatinine, age, and sex
• Urea (BUN): a waste product from protein metabolism; levels may rise when kidney function is reduced

Creatinine and eGFR together provide an estimate of kidney filtration capacity. A reduced eGFR may suggest that the kidneys are not filtering as efficiently. Elevated urea may reflect increased protein breakdown or reduced kidney clearance. These markers are typically interpreted together and in the context of hydration, diet, and medication use.

The test requires a blood draw at a certified sample point (afnamepunt). There are over 750 locations across the Netherlands. After placing your order, you can select a convenient location and schedule your visit.

This test may be considered when:

• You want to assess kidney function as part of a routine check
• You take medications that may affect the kidneys
• You have risk factors for kidney disease
• You want baseline kidney data for future comparison

Each marker is shown with your value and the reference range. A normal eGFR generally suggests the kidneys are filtering adequately. A reduced eGFR or elevated creatinine may warrant further investigation. Temporary factors such as dehydration or high protein intake can affect results, so interpretation should be done by a healthcare provider.

No specific preparation is needed. Staying well hydrated the day before can help ensure accurate results. No fasting is required.

Your results are typically available within a few working days. Each marker is shown with your value, the reference range, and an explanation. These results can be discussed with your healthcare provider to determine whether any follow-up may be appropriate.