Free tool
Wells score calculator (DVT & PE)
Tally the Wells criteria for deep vein thrombosis or pulmonary embolism and read the pre-test probability in both the two-tier (likely/unlikely) and three-tier models. A risk-stratification aid, not a diagnosis — and nothing you enter leaves your device.
Wells score (DVT) worksheet — ____________
Choose the instrument, then tick each criterion that is present. The point weight sits beside each item; the alternative-diagnosis item in the DVT set subtracts 2.
Wells DVT total
0/ 9
Three-tier model
Low pre-test probability
Two-tier model
DVT unlikely
A pre-test (pre-imaging) probability of DVT, not a diagnosis or a rule-out.
A low score does not rule out a clot
A low or “unlikely” score does NOT exclude DVT or PE on its own. The validated pathway pairs a low/unlikely score with a negative D-dimer (and imaging where indicated). The D-dimer / PERC / CTPA next step is the conventionally cited pathway your treating clinician decides on — not a recommendation this tool makes — and clinically concerning suspicion warrants imaging regardless of the score.
Screening / risk-stratification aid, not a diagnosis. This estimates a pre-test (pre-imaging) probability of DVT or PE only — it does not diagnose or rule out either, does not order a D-dimer or imaging, and must not delay imaging where suspicion is high. A low or “unlikely” score does NOT exclude DVT/PE on its own: the validated pathway pairs a low/unlikely score with a negative D-dimer (and imaging where indicated). The D-dimer / PERC / CTPA next step is the conventionally cited pathway your treating clinician decides on, not a recommendation this tool makes for this patient. Cut-points are reproduced from the cited sources; guidelines and the diagnostic pathway evolve — verify against your current local/national protocol.
Privacy: Runs entirely in your browser — nothing you enter is sent to a server or stored. Not a medical device; no CDSCO/FDA status is claimed.
Criteria, point weights, and probability bands reproduced from: MDCalc — Wells' Criteria for DVT (criteria, scoring, probability bands).; MDCalc — Wells' Criteria for Pulmonary Embolism; cross-confirmed against StatPearls / NCBI Bookshelf NBK558958..
How the Wells score works
The Wells score turns a handful of clinical features into a pre-test probability of venous thromboembolism — one criteria set for deep vein thrombosis, a separately-weighted set for pulmonary embolism. Both are reported in two ways: the original three-tier low/moderate/high model and the dichotomised likely/unlikely model used alongside D-dimer testing. The score frames the next step; it never diagnoses or excludes a clot, and a low score is only reassuring when paired with the rest of the validated pathway.
Many teams still tally the criteria on a scrap of paper. With clinical templates in the EMR on Avinya Plus, the same arithmetic can live on the note: build the Wells criteria into a template and total them with the formula engine, so the probability band sits beside the examination instead of on a calculator. The arithmetic is the engine's; the pathway decision stays yours.
Frequently asked questions
- How is the Wells score for DVT calculated?
- Nine clinical features each add a point, and an alternative diagnosis at least as likely as DVT subtracts two. The total maps to a three-tier probability (≤0 low, 1–2 moderate, ≥3 high) and a two-tier model (≤1 DVT unlikely, ≥2 DVT likely).
- How is the Wells score for PE calculated?
- Seven features carry fixed weights (clinical signs of DVT and “PE is the most likely diagnosis” score 3 each; heart rate >100, immobilisation/surgery, and prior PE/DVT score 1.5; haemoptysis and malignancy score 1). The total maps to low/moderate/high and to PE unlikely (≤4) or likely (>4).
- Does a low Wells score rule out a clot?
- No. A low or “unlikely” score does not exclude DVT or PE on its own. The validated pathway pairs it with a D-dimer (and imaging where indicated); the tool reports the probability only and does not order tests.
- Does the tool tell me to order a CTPA or D-dimer?
- No. The D-dimer / PERC / CTPA next step is the conventionally cited pathway, shown as an attributed note. The decision rests with the treating clinician; clinically concerning suspicion warrants imaging regardless of the score.
- Does any of the data I enter leave my browser?
- No. The scoring runs entirely in your browser; nothing you enter is sent to a server or stored. The print option produces a clean worksheet you can save as a PDF.
Sources
- MDCalc — Wells' Criteria for DVT (criteria, scoring, probability bands).
- MDCalc — Wells' Criteria for Pulmonary Embolism; cross-confirmed against StatPearls / NCBI Bookshelf NBK558958.
The DVT and PE criteria, point weights, and probability bands are reproduced from MDCalc (calc 362 and 115), cross-checked against the original Wells validation studies and StatPearls (NBK558958). The score gives a pre-test probability, not a diagnosis. Reviewed against the sources on 2026-06-29; verify against the current guideline.
Keep the risk score on the record.
In Avinya Plus you can build the Wells criteria into a clinical template, total them automatically, and keep the probability band on the note — the pathway decision stays with you. See it on a quick demo.