Kidney Function Test: Creatinine, Urea and eGFR Explained
Creatinine alone is not enough. eGFR adjusts it for age and sex, and urine tests add the missing piece.
Creatinine and urea
Creatinine is a waste product from muscles, cleared by the kidneys. When kidney function falls, creatinine rises. Urea also rises in kidney problems, but also with dehydration, high protein intake and bleeding.
eGFR
eGFR estimates how well the kidneys filter blood, using creatinine, age and sex. It is the main number doctors use to stage chronic kidney disease.
Who should test
People with diabetes, high blood pressure, a family history of kidney disease, or long-term painkiller use should ask their doctor about regular kidney checks, including a urine test for protein.
Disclaimer: This article is general health information only, not medical advice. Consult a doctor for personal health decisions, symptoms, or test results.
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