DiabetesReported in %Hemoglobin A1c (HbA1c)
The share of hemoglobin that has glucose attached. It reflects average blood sugar over about three months.
What it measures
Glucose sticks to hemoglobin for the life of the red cell, roughly three months. HbA1c is the percentage of hemoglobin that is glycated. It does not spike after breakfast, which is why you will sometimes see a high fasting glucose and a calm HbA1c, or the reverse. The typical interval on this panel is 3.9–5.7%. Screening categories treat 5.7% and above as the start of the prediabetes range, so a result sitting on 5.7 is worth a conversation rather than a shrug.
Why it is on the panel
HbA1c is the standard way to describe longer-run glucose control, both for finding diabetes and for following it. It captures the weeks you do not test, including the evenings a single fasting glucose misses.
How to read it
Read it with the fasting glucose and with the CBC. Conditions that lengthen or shorten red-cell life change HbA1c without changing average glucose. Iron deficiency can raise it slightly. Hemolytic anemia, blood loss, and some hemoglobin variants can lower it or make it unreliable. If the HbA1c and the glucose tell opposite stories, the red cell indices are the first place to look.
When it runs higher
Sustained higher glucose raises HbA1c. Adult categories usually call under 5.7% typical, 5.7–6.4% prediabetes, and 6.5% or higher the diabetes range. Two results in the diabetes range, or one HbA1c plus a confirmatory glucose, are how clinicians generally make a new diagnosis. Illness and steroids raise glucose for days to weeks and can nudge HbA1c if they last long enough.
When it runs lower
A result at the low end of the interval can mean truly lower average glucose, or red cells that do not live long enough to pick up much glucose. Pregnancy, hemolysis, and recent blood loss are examples. A very low HbA1c is not a trophy if the CBC shows anemia.
Same group
Other Diabetes tests
How to use this page
This page explains what the measurement is for. It is educational. Your Healiam report includes the reference interval for your age and sex, and a clinician reads that result with your history, medicines, and the rest of the panel. Talk with a clinician before changing diet, supplements, or treatment because of a number on a report.
HbA1c
HbA1c is part of the full panel.
No referral or insurance required.
One preventive draw covers this measurement and the rest of the Healiam panel. CLIA-certified results come back in days.