What role does HbA1c play in fertility?

HbA1c (glycated hemoglobin) is a long-term blood glucose marker reflecting average blood sugar over the past 2–3 months. Regarding fertility, HbA1c plays an indirect but significant role: elevated levels indicate poor glycemic control, which is linked to insulin resistance, PCOS (polycystic ovary syndrome), and ovulatory disorders. In women with PCOS or diabetes, high HbA1c can impair egg quality, implantation, and menstrual regularity. In men, elevated HbA1c may negatively affect sperm quality (motility, DNA integrity). However, HbA1c is not a direct fertility test – it serves as a metabolic risk marker. The evidence is based on mechanistic links and clinical observations, not on randomized trials proving causation. MyBody-X may offer HbA1c as a biomarker, but interpretation must consider other factors (age, hormone status, lifestyle). A normal HbA1c does not rule out fertility issues, and an elevated value requires medical evaluation. Caution against overinterpretation: the effect size is moderate, and many other factors are more influential.