4Ts score (Lo 2006) for heparin-induced thrombocytopenia pretest probability

4Ts score (Lo 2006) for heparin-induced thrombocytopenia pretest probability. Four caller-assigned integers 0-2 (thrombocytopenia, timing, thrombosis, other causes) using the published table; magent sums only (max 8). Bands 0-3 low, 4-5 intermediate, and 6-8 high pretest probability. Not a diagnosis of HIT, not the HEP score, and not an antibody result. magent does not grade platelet counts or day of onset.

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Endpoint

POST https://api.magentlab.com/api/calc/four_ts

Our checks, last 30 days

Example input (from the provider)

{
  "body": {
    "items": [
      {
        "other_causes": 0,
        "thrombocytopenia": 0,
        "thrombosis": 0,
        "timing": 0
      },
      {
        "other_causes": 0,
        "thrombocytopenia": 0,
        "thrombosis": 0,
        "timing": 0
      }
    ]
  },
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "properties": {
            "items": {
              "items": {
                "properties": {
                  "other_causes": {
                    "description": "Caller-assigned Lo 2006 other (oTher) causes of thrombocytopenia (0, 1, or 2). More points = more HIT-like. 2: no other apparent cause. 1: possible other cause. 0: definite other cause.",
                    "type": "integer"
                  },
                  "thrombocytopenia": {
                    "description": "Caller-assigned Lo 2006 thrombocytopenia points (0, 1, or 2). magent does not grade platelet counts. 2: platelet fall >50% AND nadir >=20. 1: fall 30-50% OR nadir 10-19. 0: fall <30% OR nadir <10.",
                    "type": "integer"
                  },
                  "thrombosis": {
                    "description": "Caller-assigned Lo 2006 thrombosis points (0, 1, or 2). 2: new thrombosis, skin necrosis, or acute systemic reaction after heparin bolus. 1: progressive/recurrent thrombosis, silent thrombosis, or erythematous skin lesions. 0: none.",
                    "type": "integer"
                  },
                  "timing": {
                    "description": "Caller-assigned Lo 2006 timing points (0, 1, or 2). magent does not infer day of onset. 2: clear onset days 5-10, or <=1 day with prior heparin within 30 days. 1: consistent with days 5-10 but not clear; onset after day 10; or <=1 day with heparin 30-100 days ago. 0: fall too early without recent heparin.",
                    "type": "integer"
                  }
                },
                "required": [
                  "thrombocytopenia",
                  "timing",
                  "thrombosis",
                  "other_causes"
                ],
                "type": "object"
              },
              "maxItems": 25,
              "minItems": 1,
              "type": "array"
            }
          },
          "required": [
            "items"
          ],
          "type": "object"
        },
        "headers": {
          "additionalProperties": {
            "type": "string"
          },
          "type": "object"
        },
        "method": {
          "const": "POST",
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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