Kharbanda 2018 Table 3 pediatric appendicitis risk calculator (pARC)

Kharbanda 2018 Table 3 pediatric appendicitis risk calculator (pARC): logistic probability from sex, age (5-18 years), pain duration, pain with walking, migration of pain to RLQ, maximal RLQ tenderness, abdominal guarding, and ANC (x10^3/uL; 1.77*sqrt(ANC) if <14, else constant 6.62). Returns logit and estimated_probability_percent. Not a medical device, not a diagnosis, not PAS, and not Alvarado. magent does not examine the child.

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

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

Our checks, last 30 days

Example input (from the provider)

{
  "body": {
    "items": [
      {
        "abdominal_guarding": false,
        "age": 15,
        "anc_10e3_ul": 2,
        "maximal_tenderness_rlq": false,
        "pain_duration": "lt_24",
        "pain_migration_rlq": false,
        "pain_with_walking": false,
        "sex": "female"
      },
      {
        "abdominal_guarding": false,
        "age": 15,
        "anc_10e3_ul": 2,
        "maximal_tenderness_rlq": false,
        "pain_duration": "lt_24",
        "pain_migration_rlq": false,
        "pain_with_walking": false,
        "sex": "female"
      }
    ]
  },
  "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": {
                  "abdominal_guarding": {
                    "description": "Caller-assigned abdominal guarding (Kharbanda 2018 Table 3 +0.67). magent does not examine the child.",
                    "type": "boolean"
                  },
                  "age": {
                    "description": "Age in whole years from 5 to 18 (Kharbanda 2018 derivation). Age 5-7 maps to 5-7.9 y; male 8-13 and female 8-11 use the age 8-13.9 y term; male 14-18 y and female 12-18 y are the Table 3 reference.",
                    "type": "integer"
                  },
                  "anc_10e3_ul": {
                    "description": "Absolute neutrophil count in x10^3/uL (0-80). Kharbanda 2018 Table 3: if ANC < 14, add 1.77*sqrt(ANC); if ANC >= 14, add 6.62 instead of the sqrt term. Required; magent does not impute ANC from WBC.",
                    "type": "number"
                  },
                  "maximal_tenderness_rlq": {
                    "description": "Caller-assigned maximal tenderness in the right-lower quadrant (Kharbanda 2018 Table 3 +1.14). magent does not examine the child.",
                    "type": "boolean"
                  },
                  "pain_duration": {
                    "description": "Kharbanda 2018 Table 3 duration of pain as assigned by the caller: lt_24 (reference, 0), 24_lt_48 (+0.47), or 48_96 (+0.10). Derivation excluded pain beyond 96 hours. Do not send a nausea or vomiting flag.",
                    "enum": [
                      "lt_24",
                      "24_lt_48",
                      "48_96"
                    ],
                    "type": "string"
                  },
                  "pain_migration_rlq": {
                    "description": "Caller-assigned history of migration of pain to the right-lower quadrant (Kharbanda 2018 Table 3 +0.46). magent does not examine the child.",
                    "type": "boolean"
                  },
                  "pain_with_walking": {
                    "description": "Caller-assigned presence of pain with walking (Kharbanda 2018 Table 3 +1.05). magent does not examine the child.",
                    "type": "boolean"
                  },
                  "sex": {
                    "description": "Caller-assigned sex. Male adds 1.28. Combined with age for the Table 3 age-and-sex terms. magent does not examine the child.",
                    "enum": [
                      "female",
                      "male"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "age",
                  "sex",
                  "pain_duration",
                  "pain_with_walking",
                  "pain_migration_rlq",
                  "maximal_tenderness_rlq",
                  "abdominal_guarding",
                  "anc_10e3_ul"
                ],
                "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"
}

This page as JSON