Wells Score DVT Calculator

Wells Score DVT Calculator for Hematology. Likely and unlikely guide the next diagnostic pathway; neither confirms nor excludes DVT. The form requires an explicit response for every criterion and retains negative totals.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

The two-level DVT score adds the nine assessed positive findings and subtracts two when an alternative diagnosis is at least as plausible. A total at least 2 is likely; a total below 2 is unlikely. Bed rest at exactly 3 days and calf difference at exactly 3 cm meet their respective inclusive criteria.

When to use this calculator

Clinical pretest-probability assessment for suspected DVT in a compatible adult diagnostic pathway.

Inputs used

  • Cancer: treatment now or within 6 months, or palliative disease
  • Leg weakness/paralysis or recent lower-limb plaster immobilization
  • Bed rest for at least 3 days, or major surgery under general/regional anesthesia within 12 weeks
  • Tenderness following the deep veins
  • Swelling of the whole leg
  • Calf circumference difference at least 3 cm (measured 10 cm below tibial tuberosity)
  • Pitting edema limited to the symptomatic leg
  • Visible collateral superficial veins, excluding varicosities
  • Documented previous DVT
  • Another diagnosis is at least as plausible as DVT (subtract 2 points)

Clinical interpretation

Likely and unlikely guide the next diagnostic pathway; neither confirms nor excludes DVT. The form requires an explicit response for every criterion and retains negative totals.

Worked example

Three one-point findings with an alternative diagnosis give 3 - 2 = 1, classified unlikely. Two positive findings without the subtraction give 2, classified likely.

Limitations and safety notes

Clinical examination and subjective alternative-diagnosis assessment are not supplied by the calculator. Pregnancy, recurrent events and assay-specific pathways need relevant guidance. Original paraphrases and arithmetic are not a reproduced licensed worksheet.

Frequently asked questions

Can a score below zero be valid?

Yes. The alternative-diagnosis subtraction can produce -2; it remains in the two-level unlikely category and does not rule out thrombosis.

What does this result leave unresolved?

Clinical examination and subjective alternative-diagnosis assessment are not supplied by the calculator. Pregnancy, recurrent events and assay-specific pathways need relevant guidance. Original paraphrases and arithmetic are not a reproduced licensed worksheet.

References

  • https://www.nice.org.uk/guidance/ng158/chapter/Recommendations

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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