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Hemoglobin A1c (HbA1c) with High-Performance Liquid Chromatography (HPLC) Method

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

This test measures the average level of blood sugar (glucose) over the past 2–3 months by analyzing your red blood cells.

Quick summary

["Helps track long-term blood sugar control for diabetes management."]

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

Key facts at a glance

LOINC
55243-0
Short code
HBB c.364G>C Bld Ql
Synonyms
HBB c.364G>C Bld Ql
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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 This Test Matters

HbA1c reflects your blood sugar levels over time, giving doctors a clearer picture of how well your diabetes is managed. Unlike daily blood sugar checks, this test provides a snapshot of trends that help prevent complications like nerve damage or kidney issues.

How It’s Done

A small blood sample is taken from your arm, usually during a routine visit. The sample is processed using HPLC to separate hemoglobin types and measure the percentage of HbA1c.

What to Expect Before or After

No special preparation is needed, but inform your doctor about recent illnesses, medications (especially blood thinners), or blood transfusions. Results may take a few days to process.

What the Results Mean

Results are reported as a percentage. While exact ranges vary by lab, higher levels may indicate poor blood sugar control, while lower levels could suggest recent lower blood sugar. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c

Frequently asked questions

HbA1c is a key tool for diagnosing diabetes (typically ≥6.5%) and monitoring treatment effectiveness. It helps adjust medications, lifestyle changes, or referrals to specialists like endocrinologists.
This test is not affected by short-term stress, exercise, or recent blood sugar spikes, making it reliable for long-term tracking.
Unlike fingerstick glucose tests, HbA1c doesn’t depend on timing or diet, offering a consistent measure of average blood sugar.
If you have kidney disease or certain blood disorders, your HbA1c results might be affected. Your doctor will consider these factors when interpreting your results.
How often should I get this test?
Typically every 3–6 months for people with diabetes, but your doctor may recommend more frequent checks if your blood sugar is unstable or you’re adjusting treatments.
  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