LOINC lab/observation code search API

Searches LOINC (lab & clinical observation codes) by term, returning the LOINC number, component, long common name, and class. Answers 'What is the LOINC code for glucose?', 'Find lab codes for hemoglobin a1c'.

Price$0.01per request

MethodPOST

Route/v1/health/clinical-loinc-search

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache604800s public

healthclinicalloinclablaboratoryobservationmedical-codingterminologynlm

API URLhttps://x402.hexl.dev/v1/health/clinical-loinc-search

Integration docs

Example request

{
  "term": "glucose",
  "max": 2
}

Example response

{
  "query": "glucose",
  "totalMatches": 1024,
  "returned": 2,
  "results": [
    {
      "loinc": "74790-7",
      "component": "Glucose challenge panel",
      "longCommonName": "Glucose challenge (hydrogen breath test) panel - Exhaled gas",
      "class": ""
    },
    {
      "loinc": "104708-3",
      "component": "Estimated average glucose",
      "longCommonName": "Deprecated Estimated average glucose [Moles/volume] in Blood",
      "class": ""
    }
  ],
  "codingSystem": "LOINC",
  "disclaimer": "Informational reference/terminology data only — NOT medical advice. Verify against authoritative sources and a qualified professional before any clinical, billing, or treatment decision."
}

Input schema

{
  "type": "object",
  "required": [
    "term"
  ],
  "properties": {
    "term": {
      "type": "string"
    },
    "max": {
      "type": "integer",
      "minimum": 1,
      "maximum": 30,
      "default": 10
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}