Can HbA1c help with fertility?

HbA1c is a marker of average blood glucose over 2–3 months, primarily used for diabetes diagnosis and management. Direct evidence linking HbA1c to general fertility is limited. However, elevated HbA1c indicates poor glycemic control, which is associated with reduced fertility in women with polycystic ovary syndrome (PCOS) or diabetes. Improved glucose regulation can increase pregnancy rates in diabetic women. In men, hyperglycemia may impair sperm quality, but evidence is weaker. HbA1c alone is not a fertility test; it is a risk indicator. Comprehensive fertility assessment requires hormone panels and functional tests. The evidence is mixed: human observational studies support a link between diabetes/PCOS and fertility, but no strong data show HbA1c predicts fertility in healthy individuals. Caveat: No RCTs demonstrate that lowering HbA1c in non-diabetic individuals improves fertility. Use HbA1c as part of a broader metabolic evaluation, not as a standalone fertility tool.