Wells DVT Score Calculator

x402

Wells DVT Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

Computes the Wells deep-vein thrombosis pretest probability score from 10 clinical flags, returning both three-tier and two-tier risk bands.

Price / call$0.005

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StatusUnknown

How this service works

Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.

Output

Returns the numeric Wells DVT total score along with the three-tier risk category (low, moderate, high) and two-tier risk band (DVT unlikely vs. DVT likely), based on the published Wells et al. criteria with citation. Output is deterministic given the same boolean inputs.

Example use cases

ED triage DVT risk stratification

“I have an ER patient with a swollen left leg. They have active cancer, were bedridden for 4 days last week, have pitting edema confined to the symptomatic leg, and localized tenderness along the deep vein — but no calf swelling >3 cm, no collateral veins, no paralysis, no prior DVT, and no equally likely alternative diagnosis. What's their Wells DVT score and risk band?”

Pre-ultrasound probability assessment

“Before ordering a Doppler ultrasound, can you run the Wells DVT calculation for my patient? They have collateral superficial veins, entire leg swelling, calf swelling greater than 3 cm, and a previously documented DVT. They don't have active cancer, paralysis, recent surgery, tenderness, pitting edema, and there's no alternative diagnosis as likely as DVT.”

Clinical decision support documentation

“For charting purposes, calculate the Wells score for a post-op patient who was bedridden for 5 days after major surgery, has localized deep venous tenderness, pitting edema, and collateral veins — but no active cancer, no paralysis or cast, no leg swelling, no calf swelling over 3 cm, no previous DVT, and an alternative diagnosis is at least as likely as DVT.”

Technical details

Endpoint

GEThttps://api.magentlab.com/api/calc/wells_dvt?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a fast, deterministic, published Wells DVT pretest probability score from discrete clinical flags, especially in clinical decision support workflows, EMR integrations, or triage automation where reproducibility and citation traceability matter. Prefer over LLM-estimated risk when auditability and adherence to the original Wells 2003 scoring rubric are required.

Side effects

Missing required boolean query parameters returns a validation error
Non-boolean values for clinical flag parameters cause schema rejection
All flags false with alternative diagnosis true may yield a very low or negative score — valid but edge case
Network timeouts if the API host is unreachable
Payment failure via x402 protocol blocks the request before scoring

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "path": "/api/calc/wells_dvt",
    "count": 2,
    "items": [
      {
        "score": 2,
        "formula": "wells_dvt",
        "citation": {
          "id": "wells-dvt-2003",
          "doi": "10.1056/NEJMoa023153",
          "title": "Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis",
          "source": "N Engl J Med. 2003;349(13):1227-1235",
          "authors": "Wells PS, Anderson DR, Rodger M, et al."
        },
        "two_tier": "likely",
        "max_score": 9,
        "components": [
          {
            "factor": "active_cancer",
            "points": 1,
            "present": true
          },
          {
            "factor": "paralysis_or_cast",
            "points": 0,
            "present": false
          },
          {
            "factor": "bedridden_or_surgery",
            "points": 0,
            "present": false
          },
          {
            "factor": "tenderness",
            "points": 0,
            "present": false
          },
          {
            "factor": "entire_leg_swollen",
            "points": 0,
            "present": false
          },
          {
            "factor": "calf_swelling_gt_3cm",
            "points": 1,
            "present": true
          },
          {
            "factor": "pitting_edema",
            "points": 0,
            "present": false
          },
          {
            "factor": "collateral_veins",
            "points": 0,
            "present": false
          },
          {
            "factor": "previous_dvt",
            "points": 0,
            "present": false
          },
          {
            "factor": "alternative_diagnosis_as_likely",
            "points": 0,
            "present": false
          }
        ],
        "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
        "three_tier": "moderate",
        "formula_expression": "Wells DVT = +1 each of 9 findings; −2 if alternative_diagnosis_as_likely"
      },
      {
        "score": 2,
        "formula": "wells_dvt",
        "citation": {
          "id": "wells-dvt-2003",
          "doi": "10.1056/NEJMoa023153",
          "title": "Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis",
          "source": "N Engl J Med. 2003;349(13):1227-1235",
          "authors": "Wells PS, Anderson DR, Rodger M, et al."
        },
        "two_tier": "likely",
        "max_score": 9,
        "components": [
          {
            "factor": "active_cancer",
            "points": 1,
            "present": true
          },
          {
            "factor": "paralysis_or_cast",
            "points": 0,
            "present": false
          },
          {
            "factor": "bedridden_or_surgery",
            "points": 0,
            "present": false
          },
          {
            "factor": "tenderness",
            "points": 0,
            "present": false
          },
          {
            "factor": "entire_leg_swollen",
            "points": 0,
            "present": false
          },
          {
            "factor": "calf_swelling_gt_3cm",
            "points": 1,
            "present": true
          },
          {
            "factor": "pitting_edema",
            "points": 0,
            "present": false
          },
          {
            "factor": "collateral_veins",
            "points": 0,
            "present": false
          },
          {
            "factor": "previous_dvt",
            "points": 0,
            "present": false
          },
          {
            "factor": "alternative_diagnosis_as_likely",
            "points": 0,
            "present": false
          }
        ],
        "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
        "three_tier": "moderate",
        "formula_expression": "Wells DVT = +1 each of 9 findings; −2 if alternative_diagnosis_as_likely"
      }
    ]
  }
}

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