Does daily monitoring of blood glucose predict hemoglobin A1c levels?

Abstract

Hemoglobin A1c (HbA1c) levels correlate closely, though not perfectly, with blood glucose levels in patients with diabetes (strength of recommendation [SOR]: A, based on systematic reviews). Correlation is higher for blood glucose levels later in the day than earlier in the day, higher for blood glucose levels in the most recent 30 days than from the prior 31-120 days, and higher for patients with type 2 diabetes compared with patients with type 1 diabetes (SOR: A, based on cohort studies).