Ali Raza
Background
Who builds this site
Ali Raza is a web developer and the founder of Gem Programmers. He builds fast, accessible tools and technical-SEO-first websites — the kind where the markup, the performance budget and the internal linking are treated as part of the product rather than something added afterwards.
This site is one of those builds. The calculation engine is pure, dependency-free TypeScript covered by an automated test suite that asserts against published reference values; nothing a reader types is transmitted, logged or stored. How each equation is implemented and where it came from is documented in full on the methodology page.
Editorial role
What the byline means — and what it does not
Responsible for
- Implementing every equation directly from its primary publication, with its constants cited.
- The automated test suite that checks the arithmetic against published reference values.
- Site architecture, accessibility, performance and the client-side-only privacy guarantee.
- Sourcing and editing the written guides, and commissioning guest contributions.
Not a clinician
Ali Raza is a developer, not a licensed healthcare professional. The clinical content on this site is implemented from peer-reviewed primary sources and tested for arithmetic correctness, but it has not yet been independently reviewed by a licensed clinician. The site states this openly on every page rather than implying a review it has not had.
If you are a pharmacist, physician or nurse practitioner willing to review this content, you would be credited by name and credential on every page. Get in touch.
Articles
Guides written for CrCl Calculator
All 10 guides currently published, each supporting one of the calculators. Browse them all on the blog index.
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.
Work together
Gem Programmers — development & marketing
Gem Programmers builds production web applications, clinical and financial calculators, and content programmes that are designed to rank. If you need something like this site built for your own domain, get in touch.
Tools built on this site
CrCl Calculator (Cockcroft-Gault)
Standard adult creatinine clearance with actual, ideal and adjusted body weight side by side.
Open calculatorCKD-EPI eGFR & CrCl Conversion Calculator
CKD-EPI 2021 creatinine, cystatin C and combined equations, plus Schwartz for children and a CrCl comparison.
Open calculatorCrCl for Obese, Elderly, Amputee & Pediatric Patients
Weight-basis selection, Salazar-Corcoran, amputation correction, paediatric equations and mL/hour output.
Open calculator24-Hour Urine Creatinine Clearance Calculator
Measured clearance from a timed collection, with a collection-adequacy check and BSA normalisation.
Open calculator
Get in touch
Corrections, contributions and enquiries
Clinical corrections take priority over everything else on this site. If an equation, threshold or caveat here is wrong, we want to hear about it.
Report a clinical error
Tell us the page, what is incorrect, and a source if you have one. Please do not include any patient information.
Email a correctionMore ways to reach us →Write for us
We publish guest guides from pharmacists, prescribers, nurses and clinical educators — with a real byline and a link back to your work.
See the guidelinesRead the existing guides →Development & marketing
This site is built and maintained by Gem Programmers. If you need a calculator, a technical-SEO build or a content programme of your own, talk to us.
Message on WhatsAppAbout Ali Raza →Try the calculators
Four client-side renal function calculators, free, with the working shown and nothing stored.
Medical disclaimer: This calculator is intended for healthcare professional reference and educational purposes only. It does not replace clinical judgment or the advice of a licensed provider. Always verify dosing decisions against institutional protocol and current prescribing information.