Some of the sugar in your blood attaches to the haemoglobin inside your red blood cells. Therefore, medical conditions that affect your red blood cells or haemoglobin can affect your HbA1c results. Such conditions include for example anaemia, iron deficiency, vitamin deficiencies or kidney disease amongst others.

The following medications may affect your results:

  • Corticosteroids
  • Antipsychotic drugs
  • Antiretrovirals
  • Dapsone
  • Aspirin
  • High dose Vitamin C or E

Dried blood spot results for HbA1c are comparable to results from traditional blood testing methods, however effects related to improper collection, contamination or transportation of your sample may impact your individual results.