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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 to 3 months by examining the percentage of hemoglobin that is coated with sugar. It helps doctors assess long-term blood glucose control.

Quick summary

["HbA1c reflects your blood sugar management over time and is key for diabetes management."]

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

Key facts at a glance

LOINC
105300-8
Short code
Hgb BldMV-sCnc
Synonyms
Hgb BldMV-sCnc
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
12
Ref high
17.5
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85018
SNOMED
900000000000003004
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why is this test important?

HbA1c is crucial because it provides a snapshot of how well your blood sugar has been controlled over time. Unlike daily blood sugar checks, it gives doctors a clearer picture of trends, helping them adjust treatments like medication or diet if needed.

How is this test performed?

A small blood sample is taken from your arm, usually by a healthcare professional. The sample is then analyzed in a lab to determine the percentage of hemoglobin that is glycated (coated with sugar). This test is typically done on whole blood.

What does a high or low HbA1c mean?

An elevated HbA1c level (typically above 6.5%) suggests poor blood sugar control and may indicate diabetes or prediabetes. Lower levels (typically below 5.7%) may indicate good blood sugar management but can sometimes be due to other factors like malnutrition or certain medications.

What can affect HbA1c results?

Several factors can influence HbA1c levels, including recent blood sugar fluctuations, certain medications (like insulin or birth control pills), pregnancy, chronic illnesses (like kidney disease or liver disease), and blood loss from procedures or injuries.

Reference range

Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A

Specimen: whole-blood

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c

Frequently asked questions

How often should I get this test?
The frequency of HbA1c testing depends on your health status. People with diabetes typically get tested every 2 to 4 months, while those at risk for prediabetes may need testing every 1 to 2 years. Always follow your healthcare provider’s recommendations.
What do my results mean if I don’t have diabetes?
If you don’t have diabetes, an HbA1c result can still provide valuable information. A result in the prediabetes range (typically 5.7% to 6.4%) may signal that your blood sugar levels are consistently higher than normal and could increase your risk of developing diabetes. Your doctor may recommend lifestyle changes or further testing.
Can lifestyle changes affect my HbA1c results?
Yes, lifestyle changes such as a balanced diet, regular physical activity, and maintaining a healthy weight can significantly impact your HbA1c levels. Improving these habits can help lower your HbA1c and improve overall blood sugar control.
  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