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Hemoglobin A1c (HbA1c) from donor whole blood

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

This test measures the average blood sugar levels over the past 2–3 months by analyzing hemoglobin bound to glucose in red blood cells.

Quick summary

["Helps assess long-term blood sugar control, often used in donor screening for diabetes-related conditions."]

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

Key facts at a glance

LOINC
96635-8
Short code
HLA-C Donr
Synonyms
HLA-C Donr
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Measures

HbA1c reflects the percentage of hemoglobin molecules that have glucose attached, indicating how consistently your blood sugar has been managed. It’s a key marker for chronic blood sugar levels, not just immediate spikes or drops.

Why It’s Done in Donors

Donors may have this test to screen for diabetes or pre-diabetes, as high HbA1c can indicate poor long-term blood sugar control, which could affect their eligibility for blood donation or safety.

How It’s Collected

A small blood sample is taken from the donor’s arm, similar to other routine blood tests. The sample is processed to measure the HbA1c level without further preparation needed by the donor.

What to Expect Before or After

No special preparation is required, but donors should inform their blood center if they have recent illnesses, medications, or changes in blood sugar levels. The process is quick, and you may feel slight discomfort from the needle.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HbA1c is critical for donor health screening because uncontrolled diabetes can lead to complications like nerve damage, kidney disease, or cardiovascular risks. A donor’s HbA1c helps ensure their blood is safe for recipients and their own long-term health.

Short name

HbA1c (Donor)

Frequently asked questions

Why might a donor’s HbA1c be checked?
Donors may be screened for HbA1c to confirm they don’t have diabetes or high blood sugar, which could impact their donation eligibility or safety.
How does HbA1c differ from a quick blood sugar test?
HbA1c provides a 2–3 month snapshot of blood sugar trends, while a quick test (like fasting glucose) shows current levels. Both are useful but measure different aspects of blood sugar management.
Can lifestyle changes affect HbA1c results?
Yes, diet, exercise, and managing diabetes medications can influence HbA1c levels over time. Donors should discuss any recent lifestyle changes with their blood center before testing.
  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