Skip to content

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

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

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

Quick summary

["Helps doctors track long-term diabetes control and adjust treatment plans."]

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

Key facts at a glance

LOINC
77747-4
Short code
HTLV II gp46-II Ab SerPl Ql IB
Synonyms
HTLV II gp46-II Ab SerPl Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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 Tests Measure

HbA1c reflects your blood sugar levels over time because red blood cells live for about 3 months. It’s a key indicator of how well your diabetes is managed, especially in people with type 1 or type 2 diabetes.

Why HbA1c Matters in Diabetes Care

A consistent HbA1c result helps doctors assess whether your current treatment (like medication or diet) is keeping your blood sugar within a safe range. It’s also useful for detecting early signs of complications, such as nerve damage or kidney issues, linked to poor blood sugar control.

How HbA1c Is Collected and Processed

This test uses a small blood sample drawn from your arm. The blood is processed to separate hemoglobin from other blood components and analyzed using high-performance liquid chromatography (HPLC), a precise method that separates and measures HbA1c levels accurately.

What Normal and High HbA1c Levels Mean

While reference ranges vary by lab, an HbA1c below 5.7% is generally considered normal for people without diabetes. For those with diabetes, a target range of 7% or lower is often recommended, but individual goals may differ based on health status and other factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: HbA1c and Diabetes Management

Short name

HbA1c

Frequently asked questions

How often should I get an HbA1c test?
If you have diabetes, your doctor may recommend an HbA1c test every 3 to 6 months to track your blood sugar control. For prediabetes, testing every 1–2 years may be sufficient unless your doctor advises otherwise.
What affects my HbA1c test results?
Several factors can influence HbA1c, including recent blood sugar fluctuations, pregnancy, certain medications (like blood thinners), and conditions like anemia or kidney disease. It’s important to discuss these with your healthcare provider.
Can I eat or drink before my HbA1c test?
No fasting is required for an HbA1c test. However, if you’re also having other blood tests, your doctor may specify fasting instructions. The test focuses on your average blood sugar over time, not recent meals.
  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