Hemoglobin A1c (HbA1c) with Pregnancy-Specific Interpretation
This test measures the average level of your blood sugar (glucose) over the past 2–3 months, adjusted for pregnancy-related changes in how your body processes hemoglobin.
["Helps monitor blood sugar control tailored to pregnancy needs."]
Key facts at a glance
- LOINC
- 67471-3
- Short code
- Hx of Pregnancy
- Synonyms
- Hx of Pregnancy
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Critical range
- 0.5 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
Why This Test Is Done During Pregnancy
Pregnancy requires careful tracking of blood sugar because high or low levels can affect both you and your baby. This test helps doctors assess whether your glucose levels are within safe ranges for healthy development, especially if you have diabetes or risk factors like obesity, family history, or gestational diabetes symptoms.
How the Test Works
A small blood sample is taken from your arm. The test measures the percentage of hemoglobin molecules coated with glucose, reflecting your average blood sugar over time. During pregnancy, your body’s insulin sensitivity changes, so results may differ from non-pregnant standards.
What the Results Mean
Results are interpreted by your healthcare provider based on pregnancy-specific guidelines rather than general reference ranges. Low or high readings may signal the need for lifestyle adjustments, diet changes, or medication adjustments to support your baby’s health.
Common Causes of Abnormal Results
Abnormal results could stem from gestational diabetes, pregestational diabetes, or hormonal shifts. Other factors like stress, diet, or activity levels may also influence readings. Your provider will discuss next steps if results are outside expected ranges.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
HbA1c (Pregnancy)
Frequently asked questions
Why might my HbA1c test be different from my non-pregnant results?
Can I eat or drink before this test?
What should I do if my HbA1c is higher than expected?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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