Skip to content

Hemoglobin A1c (HbA1c) with Immunoassay Probe

Published: August 9, 2026Updated: August 17, 2026

This test measures the average level of hemoglobin A1c in your blood over the past 2–3 months, reflecting your long-term blood sugar control.

Quick summary

["HbA1c helps doctors track diabetes management and identify trends in blood sugar levels."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
91070-3
Short code
HAV RNA Stl Ql NAA+probe
Synonyms
HAV RNA Stl Ql NAA+probe
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
CPT
84484
SNOMED
302774002
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

What This Test Measures

HbA1c is a form of hemoglobin (the protein in red blood cells that carries oxygen) that has attached a sugar molecule (glucose). The percentage of HbA1c in your blood indicates how much glucose has been present over time. This test is used primarily to diagnose and monitor diabetes and prediabetes.

Why It’s Done

Your healthcare provider may order this test if you have diabetes, prediabetes, or if you’re at risk for diabetes. It’s also used to assess how well your blood sugar is being controlled with treatment.

How It Works

A small blood sample is taken, usually from your finger. The sample is analyzed using an immunoassay probe to detect and measure the HbA1c levels.

What to Expect Before the Test

No special preparation is needed for this test. You may have a slight pinch when the blood is drawn, but it usually doesn’t cause discomfort.

Reference range

Adult: 10-40 U/LN/A

Specimen: stool

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HbA1c levels provide a snapshot of your blood sugar control over time. Levels above a certain threshold (typically 6.5% or higher) are often used to diagnose diabetes. Regular monitoring helps adjust treatment plans, such as medication or diet, to improve health outcomes and reduce complications like nerve damage or heart disease.

Short name

HbA1c Probe

Frequently asked questions

How often should I get this test?
Typically, people with diabetes are advised to get HbA1c tests every 3–6 months to track progress and make necessary adjustments to their treatment plan.
What does an abnormal result mean?
An abnormal result could indicate poor blood sugar control. If your HbA1c is consistently higher than recommended, your doctor may recommend changes in your treatment, such as adjusting medication, improving diet, or increasing physical activity.
Can lifestyle changes affect HbA1c results?
Yes, lifestyle changes like eating a balanced diet, exercising regularly, and managing stress can significantly impact HbA1c levels. Small, sustainable changes often lead to better long-term 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 17, 2026. · Read our editorial policy