Skip to content

Hemoglobin A1c (HbA1c) with Mass Concentration Measurement

Published: August 9, 2026Updated: August 16, 2026

This test measures the average blood sugar levels over the past 2–3 months by analyzing your red blood cells.

Quick summary

["HbA1c helps doctors track diabetes management and long-term blood sugar control."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
3276-3
Short code
HMWK PPP-aCnc
Synonyms
HMWK PPP-aCnc
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
coag
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What HbA1c Measures

HbA1c reflects the percentage of hemoglobin molecules that have sugar (glucose) attached. It’s a key indicator of how well your body manages blood sugar over time, especially useful for diagnosing and monitoring diabetes.

How It’s Used in Healthcare

Doctors use HbA1c to assess whether your diabetes treatment plan is effective. It’s a standard test for diagnosing prediabetes and diabetes, as well as evaluating chronic blood sugar levels in people with diabetes.

How the Test Works

Blood is drawn, and the hemoglobin is separated from other blood components. The test then measures the proportion of hemoglobin molecules linked to glucose, providing an average reading over months.

What to Expect Before the Test

No special preparation is needed, but you may fast for 8–12 hours if your doctor recommends it. Wear comfortable clothing and arrive with an ID for insurance verification.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c

Frequently asked questions

Why is my HbA1c level important?
Your HbA1c level helps your healthcare provider determine if your blood sugar is consistently within a healthy range. Lower levels may indicate good control, while higher levels suggest poor management and potential risks for complications like nerve damage or kidney issues.
What does a high HbA1c mean?
A high HbA1c typically means your blood sugar has been elevated over time, which can increase the risk of long-term health problems. Your doctor will discuss lifestyle changes, medications, or adjustments to your treatment plan if needed.
Can diet or exercise change my HbA1c results?
Yes! Regular physical activity and a balanced diet can improve your HbA1c levels. Small, sustainable changes often lead to better long-term results, so work closely with your healthcare team to tailor a plan for you.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy