Glycated haemoglobin (HbA1c) tests — IFCC standardised

PH3434 / 8473

OpenSAFELY

Jan 26, 2026

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OpenCodelists Phenotype

  1. Overview

    Codelist ID
    opensafely/glycated-haemoglobin-hba1c-tests-ifcc
    Version ID
    6d7287f8
    Coding System
    Read codes v3
    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 CTV3 codelist for patients receiving monitoring of glycated haemoglobin (HbA1c) tests using reference methods standardised by the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC).

    Note that for tests before 2018, test values in the East region appear to be recorded on a different scale (approximately 4 to 8-times greater than mean values in other regions). This issue is being investigated.

    © 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

    Codes under the CTV3 concept for IFCC-standardised HbA1c were included.

  4. References

    Source Reference

    https://www.opencodelists.org/codelist/opensafely/glycated-haemoglobin-hba1c-tests-ifcc/6d7287f8

    References

  5. Clinical Codelist

  6. API

    To Export Phenotype Details:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3434/version/8473/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(
     'PH3434',
     version_id=8473
    )

    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(
     'PH3434',
     version_id=8473
    )

    To Export Phenotype Code List:

    FormatAPI
    JSON site_root/api/v1/phenotypes/PH3434/version/8473/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(
     'PH3434',
     version_id=8473
    )

    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(
     'PH3434',
     version_id=8473
    )

  7. Version History

    Version IDNameOwnerPublish date
    Glycated haemoglobin (HbA1c) tests — IFCC standardised ieuan.scanlon2026-01-26 23:17