What it measures
Unlike a fasting glucose, A1C does not swing with your last meal, so it works well for screening and tracking. Some conditions skew it, including anemia, sickle cell trait, recent blood loss, and pregnancy.
Who should consider it
- Adults 35 and older, or younger with overweight and other risk factors
- People with a parent or sibling with type 2 diabetes
- Anyone with prediabetes who wants to track progress
- People with a history of gestational diabetes or PCOS
How to read your result
American Diabetes Association categories. A diagnosis needs confirmation, so see a clinician for any result in the diabetes range.
- Prediabetes is common and often reversible with weight loss and activity.
- An A1C of 6.5% or higher needs a clinician visit for confirmation and a plan.
- Retest every 3 to 6 months if you are changing habits or treatment.
Reference ranges differ between labs. Use the range printed on your own report.
When to get care right away. Extreme thirst, frequent urination with weight loss, vomiting, or confusion: seek urgent care.
What to do next
If your A1C lands in the prediabetes range, a lipid panel and blood pressure check make sense too, since these risks cluster.
Where to order Hemoglobin A1C
These sellers include an independent physician order. You pay online and visit a partner lab. Availability, price, and lab network vary, so confirm at checkout.
Private MD Labs
Online lab seller- Says 4,500+ Quest and Labcorp locations
- Every order reviewed by a physician. Says you pay $1 to start and the rest after results.
- Secure online portal with plain-English explanations. Says many results arrive overnight.
HealthLabs
Online lab seller- Says 4,500+ labs, including Quest and Labcorp
- Online or by phone. No doctor referral or insurance needed.
- Secure HealthLabs account. Says 1 to 3 business days.
Walk-In Lab
Online lab seller- Lab network not named on its homepage
- Online, no insurance or doctor order needed. Shows a $6 physician fee per order on popular tests.
- Online account. Turnaround not stated on its homepage.
Quest Health
Lab-run- Quest, 2,000+ locations
- Buy online and book a Quest appointment. An independent provider is involved.
- Online as soon as ready, with an email alert. Provider discussion included at no extra cost.
Seller details come from each seller's own site and can change. Confirm price, lab location, and state availability at checkout.
Questions people ask
Do I need to fast for an A1C?
No. A1C reflects months, not hours, so you can test at any time of day.
Can I order an A1C without a doctor?
Yes. Online sellers include an independent physician order. Take any result in the diabetes range to your own clinician.
How often should I get an A1C?
Every 3 years is common for adults with normal results, and yearly or more often with prediabetes. Your clinician can tailor this.
Related guides
Comprehensive metabolic panel
14 markers for kidneys, liver, blood sugar, and electrolytes.
ReadLipid panel
Total cholesterol, LDL, HDL, and triglycerides in one draw.
ReadAnnual physical blood work
A solid baseline: CBC, CMP, lipids, A1C, and thyroid.
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