Kidney function tests assess how well your kidneys filter blood and remove waste. Common markers include eGFR, Creatinine, BUN (Blood Urea Nitrogen), and Urea. Abnormal results may signal dehydration, medication effects, or kidney disease.
For a broader educational overview of how kidney markers work together and how doctors interpret patterns, see our
Kidney Blood Tests Guide.
Important: Always interpret kidney test results with your doctor. Factors like muscle mass, diet, or temporary dehydration can influence numbers.
Key markers to know
- eGFR (estimated Glomerular Filtration Rate): Indicates filtration efficiency. Lower values mean reduced kidney function.
- Creatinine: A waste product from muscle metabolism; high levels can mean decreased filtration.
- BUN (Blood Urea Nitrogen): Reflects nitrogen waste; may rise with dehydration or kidney impairment.
- Urea: Similar to BUN but used in some regions instead; both measure protein breakdown waste.
- Cystatin C: A newer marker sometimes used to estimate kidney function more precisely.
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