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Kidney Function
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Currently under review
Pending specialist review and validation.
Corrected creatinine clearance is a test that estimates how well your kidneys filter creatinine, a waste product made by muscles and cleared from your blood by the kidneys. The result reflects the volume of blood that is cleared of creatinine per unit time.
This measurement is adjusted to a standard body size so results can be compared fairly across people of different shapes and ages. It is typically calculated using a timed urine collection together with a blood sample, and it offers a direct, patient-specific view of your filtering capacity.
Your care team may use corrected creatinine clearance to evaluate kidney function when a direct measurement is preferred, such as when drug dosing must be precise, when body composition is unusual, or when other estimating formulas may be less reliable. It can help assess kidney disease, monitor recovery from an acute illness, and inform decisions before procedures or imaging that may affect the kidneys.
Understanding your kidney filtering capacity helps guide safe medication choices, detect early changes, and track trends over time. When used with other tests, it contributes to a more complete picture of your kidney health and your overall risk of kidney-related complications.
Higher values generally indicate better kidney filtering, while lower values suggest reduced kidney function. If your result is unexpected, your clinician may review how the urine collection was done, your medications, and your recent diet or activity, then decide whether to repeat the test or confirm with other measures such as an estimated filtration rate or cystatin C.
Results are best interpreted alongside your history, symptoms, and other labs. Small day-to-day differences may be normal, so trends over time are often more informative. If your result points to decreased kidney function, your clinician may adjust medications, check urine for protein or blood, and recommend follow-up tests or lifestyle changes to protect kidney health.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Missing voids, incorrect timing, or spills during the timed collection can make the clearance appear falsely low or high. Follow the collection instructions closely and note any problems.
Very high meat intake, creatine supplements, and large fluid shifts can alter creatinine generation and excretion. Aim for usual diet and hydration before and during the collection unless your clinician advises otherwise.
Drugs such as cimetidine or trimethoprim can reduce tubular secretion of creatinine, lowering measured clearance, while others may have the opposite effect. Provide a full medication and supplement list to your care team.
Greater muscle mass and intense exercise increase creatinine production, while low muscle mass reduces it. These factors can shift results even when kidney function is unchanged.
Fever, infection, dehydration, heart failure, or recent surgery can change kidney blood flow and filtration. Testing during recovery or after stabilization may give a more representative result.
Physiologic changes in pregnancy and in children can alter filtration and creatinine handling. Your clinician will interpret results using age and clinical context.
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