Hematology

Wells Criteria for DVT Calculator

Pre-test probability of deep vein thrombosis

Clinical use

Use this calculator for pre-test probability of deep vein thrombosis in thehematology workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.

Interpretation

Score ≤1: unlikely — D-dimer. Score ≥2: likely — proceed to compression ultrasound. Validated for outpatient ED use, not post-surgical or ICU patients.

Required inputs

Active Cancer
Paralysis Paresis
Bedridden 3 Days
Localized Tenderness
Entire Leg Swollen
Calf Swelling 3 Cm
Pitting Edema
Collateral Veins
Previous DVT
Alternative Diagnosis Likely

Evidence and limitations

This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.

References

Wells PS et al. Lancet 1997;350:1795-1798

Frequently asked questions

What is the Wells Criteria for DVT?

Wells Criteria for DVT is a clinical calculator used for Pre-test probability of deep vein thrombosis.

How do I interpret the Wells Criteria for DVT?

Score ≤1: unlikely — D-dimer. Score ≥2: likely — proceed to compression ultrasound. Validated for outpatient ED use, not post-surgical or ICU patients.

What inputs are required for the Wells Criteria for DVT?

Required inputs include Active Cancer, Paralysis Paresis, Bedridden 3 Days, Localized Tenderness, Entire Leg Swollen, Calf Swelling 3 Cm, Pitting Edema, Collateral Veins, Previous DVT, Alternative Diagnosis Likely.