Glycated haemoglobin (HbA1c) tests (numerical value)

PH3435 / 8474

OpenSAFELY

Jan 26, 2026

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OpenCodelists Phenotype

  1. Overview

    Codelist ID
    opensafely/glycated-haemoglobin-hba1c-tests-numerical-value
    Version ID
    5134e926
    Coding System
    SNOMED CT codes
    Collections
    OpenCodelistPhenotype Library
    Tags
    No data

  2. Definition

    This codelist was taken from OpenCodelists, created by OpenSAFELY. We recommend viewing this Phenotype on the OpenCodelist website to view the most recent version.

    A SNOMED CT codelist for patients receiving monitoring of glycated haemoglobin (HbA1c) tests, which contains a numerical value using the newer IFCC units.

    © University of Oxford for the Bennett Institute for Applied Data Science 2025. This work may be copied freely for non-commercial research and study.

  3. Methodology

    We identified the full set of HbA1c level codes (see HbA1c codelist), and excluded any codes which did not have a numerical value recorded in at least 95% of coded activity.

    The older % measurement was excluded from this codelist, as a) the majority of patients who have this code receive the newer IFCC measurement on the same day, and b) the units are very different, making comparisons difficult.

  4. References

    Source Reference

    https://www.opencodelists.org/codelist/opensafely/glycated-haemoglobin-hba1c-tests-numerical-value/5134e926

  5. Clinical Codelist

  6. API

    To Export Phenotype Details:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3435/version/8474/detail/?format=json
    R Package

    # Download here

    library(ConceptLibraryClient)


    # Connect to API

    client = ConceptLibraryClient::Connection$new(public=TRUE)


    # Get details of Phenotype

    phenotype_details = client$phenotypes$get_detail(
     'PH3435',
     version_id=8474
    )

    Py Package

    # Download here

    from pyconceptlibraryclient import Client


    # Connect to API

    client = Client(public=True)


    # Get details of Phenotype

    phenotype_detail = client.phenotypes.get_detail(
     'PH3435',
     version_id=8474
    )

    To Export Phenotype Code List:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3435/version/8474/export/codes/?format=json
    R Package

    # Download here

    library(ConceptLibraryClient)


    # Connect to API

    client = ConceptLibraryClient::Connection$new(public=TRUE)


    # Get codelist of Phenotype

    phenotype_codelist = client$phenotypes$get_codelist(
     'PH3435',
     version_id=8474
    )

    Py Package

    # Download here

    from pyconceptlibraryclient import Client


    # Connect to API

    client = Client(public=True)


    # Get codelist of Phenotype

    phenotype_codelist = client.phenotypes.get_codelist(
     'PH3435',
     version_id=8474
    )

  7. Version History

    Version IDNameOwnerPublish date
    Glycated haemoglobin (HbA1c) tests (numerical value) ieuan.scanlon2026-01-26 23:17