Hemoglobin A1c
Shows your average blood sugar over about three months by measuring sugar stuck to hemoglobin on red cells. Used to screen for prediabetes and diabetes and to track how well control is holding.
Glucose in your blood sticks to hemoglobin on red blood cells; because those cells live about three months, HbA1c averages your blood sugar across that window. It is the standard screen for prediabetes and diabetes, and the main long-term gauge for people already on therapy. Daily finger sticks bounce hour to hour; A1c shows the slower arc your doctor cares about for risk and medication tuning.
Self-Pay Price Comparison
| Provider | Price | vs. Highest | Order |
|---|---|---|---|
Quest QuestHealth self-pay | $39.00 | Highest | Order · Quest |
LabCorp Labcorp OnDemand | $39.00 | Highest | Order · LabCorp |
GoodLabs Discount lab network | $4.00Best value | Best price | Order · GoodLabs |
What This Test Measures
HbA1c captures average blood sugar stuck to hemoglobin over roughly three months; most labs add a translated average-glucose line for easier comparison with home checks. Here is what each reported value does:
Percentage of hemoglobin carrying extra glucose averaged across the life of a red cell; a higher number means blood sugar ran higher for months, a lower number means averages ran lower, though anemia or transfusion can skew the read.
Translates the A1c percentage into the same units as many home meters; a high eAG mirrors a high three-month average glucose, a low eAG mirrors a low average, so it is the same trend as the percentage in a different format.
How to Read Your Results
Your A1c report lists screening bands and, when you already carry a diabetes label, goal ranges tailored to you. Here is how to read the usual flags without spiraling:
| Marker | Normal Range | If Flagged | What It Might Mean |
|---|---|---|---|
| A1c (screening bands) | Normal (no diabetes): less than 5.7%; prediabetes: 5.7%-6.4%; diabetes: 6.5% or higher (MedlinePlus Medical Encyclopedia, A1c test). | abnormal | Falling between 5.7% and 6.4% is often called prediabetes and usually leads to lifestyle coaching or repeat testing. One result in isolation rarely tells the full story; your doctor may confirm with another test. |
| A1c (known diabetes goal) | Many adults aim below 7% when stable, but targets are individualized (MedlinePlus Medical Encyclopedia, A1c test). | high | Above your agreed target usually means average glucose has run high lately. MedlinePlus notes higher A1c tracks with higher risk of eye, kidney, nerve, heart, and stroke complications over time; treatment changes are a shared decision. |
| A1c (accuracy caveats) | MedlinePlus lists conditions such as anemia, kidney disease, liver disease, some hemoglobin disorders, or recent transfusion as reasons a result may be misleading. | abnormal | If one of those situations applies, your doctor may lean on finger-stick logs, continuous glucose data, or a different assay rather than this single number. |
When to Order
Annual baseline
Adults with risk factors and anyone over 45 often add A1c to routine labs; younger adults with weight or family risk may start earlier.
Prediabetes or diabetes monitoring
Stable plans usually recheck two to four times per year; after therapy changes, your doctor may want a repeat in about three months.
Symptoms such as thirst, frequent urination, or blurry vision
Those symptoms can mean high glucose; A1c plus a fasting glucose or random glucose helps your doctor decide next steps.
Before starting a new diabetes medicine
A fresh A1c documents where you started so future draws show real change, not noise.
After major health shifts (transfusion, severe anemia)
MedlinePlus notes some blood conditions and transfusions can skew A1c; tell your doctor if that applies before you read the number.
Prep & Logistics
- Fasting
- Typically no fasting
- Sample
- Blood draw
- Results
- Usually 24-48 hours; many portals update the same day or the next.
- Referral
- Often self-order (check local rules)
- Markers
- HbA1c percent plus estimated average glucose (eAG) when the lab reports it.
Tests That Pair With This One
Broad kidney, liver, and fasting glucose screen when long-term sugar control might be hitting organs.
Same-day blood sugar snapshot to pair with the three-month A1c average.
Heart-risk lipids when diabetes, insulin resistance, or statin decisions ride alongside glucose.
FAQ
Should I get A1c or just a finger-stick A1c kit at home?
Lab A1c is standardized and what most clinicians trust for diagnosis and monitoring. Home kits vary; if a number surprises you, repeat it in a real lab and compare with fasting glucose context before you change meds.
My A1c came back 6.0%. Should I worry?
6.0% sits in the prediabetes band on standard screening cut points. It is not an emergency, but it is a nudge to talk about food, movement, sleep, and repeat testing. One draw does not lock in a label forever.
Why does my meter not match my A1c?
MedlinePlus explains that labs now convert A1c to an estimated average glucose, and that estimate may differ from your meter averages. Finger-stick logs usually reflect day-to-day swings better; use both with your doctor.
How often should I repeat an A1c?
If you are stable, many clinicians check twice a year; if therapy just changed, every three months is common until things level out. Your doctor sets the cadence from trend, not guesswork.
Sources
Prices pulled directly from provider websites and verified by hand. Reference ranges sourced from MedlinePlus. Not generated by AI.
- GoodLabs - product page (pricing context)(verified 2026-03-23)
- Quest - consumer lab shop (pricing context)(verified 2026-03-23)
- LabCorp OnDemand - Diabetes risk HbA1c (pricing context)(verified 2026-03-23)
- MedlinePlus - Hemoglobin A1C (HbA1c) Test overview
- MedlinePlus Medical Encyclopedia - A1C test (screening bands, goals, caveats)
- Clinical context: LabRecon editorial team. Not medical advice. For informational use only.
Percentage of glycated hemoglobin. Standard marker for screening and monitoring glycemic control in prediabetes and diabetes.