A national issue has been identified with some HbA1c blood test results that were carried out between July 1st and November 22nd, 2024. This test is commonly used to help diagnose and monitor diabetes and pre-diabetes (also known as non-diabetic hyperglycaemia or NDH).
During this time, certain laboratory equipment used in some NHS labs may have given results that were slightly too high. This happened due to a problem with how the machines were calibrated (set to give accurate readings).
County Durham and Darlington NHS Foundation Trust uses the lab equipment where there has been a problem identified, and therefore some patients locally may be affected.
Whilst awaiting any national guidance on the management of this issue, the Trust and partners have made the decision to take action locally to support patients.
What you need to know
- We are working closely with local GPs to identify any patients who may have been affected.
- If your result needs to be reviewed, your GP will contact you directly to discuss next steps.
- Please do not contact your GP or the hospital about this issue. GPs will be contacting all who are affected. Your support with this helps GPs focus on contacting the patients who need follow-up.
- This issue relates to HbA1c tests taken during the specified period only.
- The issue was resolved after 22 November 2024, by using a new calibrator. Additional quality checks were also implemented. CDDFT will also transition to a new testing provider in July 2025.
We are very sorry for any distress this may have caused. Thank you for your patience and understanding.
Your GP will review your test results. If action is needed, they will contact you directly. No need to call unless you've been contacted.
Do not stop any medication or treatment. If your result is under review, your GP will guide any changes based on a new test.
Yes. Additional quality checks have been put in place. CDDFT are also moving to a new HbA1c testing provider in July 2025.
No. If further action is needed, your GP will contact you promptly to ensure appropriate care continues.
It is safe to continue. These programmes provide useful lifestyle support and do not cause harm if your diagnosis is later revised.