Sitemap
All pages
Everything on this site
Calculators
- CrCl Calculator (Cockcroft-Gault)
Standard adult creatinine clearance with actual, ideal and adjusted body weight side by side.
- CKD-EPI eGFR & CrCl Conversion Calculator
CKD-EPI 2021 creatinine, cystatin C and combined equations, plus Schwartz for children and a CrCl comparison.
- CrCl for Obese, Elderly, Amputee & Pediatric Patients
Weight-basis selection, Salazar-Corcoran, amputation correction, paediatric equations and mL/hour output.
- 24-Hour Urine Creatinine Clearance Calculator
Measured clearance from a timed collection, with a collection-adequacy check and BSA normalisation.
Guides
Company
- About & Methodology
Equations used, sources cited, and who reviewed them.
- About the Author
Ali Raza — who builds and maintains this site.
- Write for Us
Contribute a clinical or technical guide to this site.
- Contact
Feedback, corrections and error reports.
- HTML Sitemap
Every page on this site, plus the XML sitemap.
Legal
Articles
- The Cockcroft-Gault Equation Explained
Where the equation came from, what each term is doing, why the 0.85 female factor exists, and the assumptions that decide whether the number you get is usable.
- CrCl vs eGFR: What's the Difference?
Two numbers, different units, different purposes — and a conversion that is routinely done wrong. How creatinine clearance and estimated GFR actually relate.
- How to Adjust CrCl for Obese Patients
Ideal body weight, adjusted body weight, Salazar-Corcoran — which to use, when, and how much difference the choice actually makes to a dose.
- Creatinine Clearance in Elderly Patients
Why a normal serum creatinine in an 84-year-old can hide severely reduced clearance, and whether rounding low creatinine values up to 1.0 is defensible.
- 24-Hour Urine Creatinine Clearance Test
How the test works, how to check whether the collection was actually complete, and why an incomplete collection is worse than no test at all.
- Renal Drug Dosing and Why CrCl Matters
How renal impairment changes drug handling, why dose reduction and interval extension are different tools, and where the common thresholds come from.
- CrCl in Amputees, Children & Race
Three populations where the standard approach is wrong: correcting weight after amputation, why Cockcroft-Gault must not be used in children, and why race went.
- Understanding Serum Creatinine
Where creatinine comes from, why the reference range misleads, and the drugs, diets and assay quirks that move the number without touching the kidneys.
- 10 Creatinine Clearance Mistakes
The errors that produce a confident wrong number — wrong weight basis, wrong units, wrong steady state, wrong measure entirely — and how to catch each one.
- GFR vs CrCl for Drug Dosing
Why drug labels still specify creatinine clearance when laboratories report eGFR, where the two diverge most, and how to decide when they disagree.