Medical Wizardry

Kidney Assessment Tool

Inputs

Age (years)

Sex

Weight (kilograms)

Used for Cockcroft–Gault creatinine clearance. Interpret carefully in extremes of body habitus.

Serum creatinine unit

Conversion: 1 milligram per decilitre ≈ 88.4 micromoles per litre.

Serum creatinine

Creatinine is stable (not acute kidney injury)

Estimation equations assume steady-state creatinine; acute kidney injury can invalidate estimates.

Input mode

UACR is urine albumin-to-creatinine ratio.

UACR (milligrams per gram)

KDIGO albuminuria categories: A1 under 30; A2 30 to 300; A3 over 300.

Urine albumin (milligrams per litre)

Used only in “calculate” mode.

Urine creatinine

Conversion for urine creatinine: 1 millimole per litre ≈ 11.3 milligrams per decilitre (approx).

Calculated UACR method (common lab units): urine albumin (milligrams per litre) divided by urine creatinine (grams per litre) gives milligrams per gram.

On renal replacement therapy (dialysis) or kidney transplant

Flags kidney failure regardless of calculated estimated glomerular filtration rate.

Notes

CKD classification uses Cause–GFR–Albuminuria (CGA). G1/G2 alone do not define CKD without evidence of kidney damage.

Results

Creatinine clearance (Cockcroft–Gault)

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Requires age, sex, weight, serum creatinine.

Estimated glomerular filtration rate (CKD-EPI 2021 creatinine)

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Requires age, sex, serum creatinine.

UACR

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Enter UACR directly or calculate from urine albumin and urine creatinine.

CKD / ESRD classification

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Enter core inputs to compute estimated glomerular filtration rate-based G category. Add UACR for A category and KDIGO risk band.

References (core equations / classification)

Cockcroft–Gault creatinine clearance equation (drug-dosing convention).
CKD-EPI 2021 creatinine estimated glomerular filtration rate equation (race-free).
KDIGO CKD classification by GFR category (G1 to G5) and albuminuria category (A1 to A3), and prognosis grid concept.

Disclaimer: Educational decision-support only. Not a substitute for clinician judgement, local protocol, medication label instructions, or nephrology consultation. Estimation equations assume steady-state creatinine; do not rely on these values alone in acute kidney injury.

Clinical notes: Cockcroft–Gault is commonly used for medication dosing in many drug labels; CKD-EPI 2021 estimated glomerular filtration rate is used for chronic kidney disease staging and longitudinal reporting. Interpret perioperatively with trajectory (acute kidney injury versus chronic kidney disease), urine output, hemodynamics, and nephrotoxin exposure.