Compare pages: 10 head-to-head guides for clinical scores

Two scores often answer almost the same question — and "almost" is where you can pick the wrong one. CHA2DS2-VASc and CHADS2 both grade stroke risk in atrial fibrillation, but the newer score identifies more truly low-risk patients. Wells DVT and Padua both touch venous thromboembolism, but one diagnoses, the other prevents. MELD and Child-Pugh both grade cirrhosis, but only one is used for transplant listing.

The new /vs/ section addresses these forks directly. Each page takes two related calculators, walks through when to use each, lays out the inputs and cutoffs in a side-by-side table, and ends with a plain-language "bottom line" plus an FAQ. Both calculators are linked at the top and bottom of the page so you can go straight from "which one?" to "use it now."

The 10 clinical comparisons

• CHA2DS2-VASc vs CHADS2 — why the newer score replaced the older one for AF stroke risk and where CHADS2 still appears.
• Wells DVT vs Padua Prediction — diagnosing an existing DVT vs preventing one in a hospitalized medical patient.
• Wells PE vs PERC Rule — risk stratification vs definitive rule-out, and why ordering matters.
• MELD/MELD-Na vs Child-Pugh — transplant listing vs general cirrhosis grading and surgical risk.
• Cockcroft-Gault vs CKD-EPI — drug dosing vs CKD staging and why they are not interchangeable.
• qSOFA vs SOFA — bedside screening vs ICU organ-dysfunction tracking in the Sepsis-3 framework.
• TIMI vs HEART — chest pain risk in the ED and why HEART discriminates better in undifferentiated presentations.
• MDRD vs CKD-EPI — why MDRD underestimates at GFR > 60 and what the 2021 race-free update changed.
• APACHE II vs SOFA — admission snapshot vs dynamic organ dysfunction tracking in the ICU.
• DAS28-CRP vs DAS28-ESR — same cutoffs, different inflammatory marker, and why the two can disagree in the same patient.

Why these pages exist

"X vs Y" is a real query — when a clinician or trainee is choosing between two scores, they often search exactly that phrase. The existing single-tool pages cover what each score does, but they do not directly answer which one to pick. The /vs/ pages fill that gap with a focused, citation-friendly format: one clear question, one clear answer, plus enough nuance to handle the edge cases.

The format follows what the underlying decisions look like in practice. Every page has the same skeleton:

• A short intro explaining how the two scores relate.
• "When to use" for each, separately.
• A side-by-side comparison table covering inputs, year published, range, cutoffs, target population, and current guideline status.
• A plain-language "bottom line" — what to do when you are not sure.
• An FAQ targeting the questions people actually ask (sex-only CHA2DS2-VASc, MELD with dialysis, PERC in pregnancy, etc.).

What is next

The current set is clinical because that is where the highest-stakes "which one" decisions happen. The infrastructure is generic, though — any two related tools can become a compare page. Plausible next additions:

• More clinical pairs — GRACE vs TIMI for ACS prognosis, Caprini vs Padua for surgical vs medical VTE risk, PSI/PORT vs CURB-65 for pneumonia severity, Glasgow Coma vs FOUR for coma assessment.
• Developer pairs — bcrypt vs argon2 for password hashing, UUID v4 vs v7 for distributed identifiers, regex flavors (PCRE vs ECMA), CSV-to-JSON tools.
• Image and PDF pairs — SVGO levels, JPEG vs WebP vs AVIF at typical quality settings.

If there is a comparison you would find useful, send it — the data file is one entry per pair and adding one is a 30-minute job.

Browse all comparisons at /vs. The clinical pages remain educational references for licensed professionals and do not replace clinical judgment — every linked calculator carries its references, source paper, and disclaimer.