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Estimated Gestational Age Based on Selected Delivery Date (Qualitative Assessment)

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

This test uses your expected delivery date to estimate how far along you are in your pregnancy, based on medical guidelines. It does not measure biological markers but relies on a calculated timeline.

Quick summary

["This is a non-invasive way to confirm your pregnancy timeline."]

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

Key facts at a glance

LOINC
11887-7
Short code
GA Est from selected delivery date
Synonyms
GA Est from selected delivery date
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
estimated-from-selected-delivery-date
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

How This Test Works

Your healthcare provider will use your reported due date to calculate your estimated gestational age. This is a standard practice in prenatal care to track pregnancy progression. The test does not involve blood, urine, or other bodily fluids; it’s purely a date-based calculation based on your medical record.

What to Expect During the Test

No preparation is needed for this test. You’ll simply provide your expected delivery date to your healthcare provider, who will then record it in your medical chart. Results are typically available immediately and used to guide prenatal care planning.

When This Test Is Ordered

This test is commonly ordered at the time of pregnancy confirmation or during early prenatal visits to establish a baseline gestational age. It helps ensure accurate timing for ultrasounds, medication dosing, and monitoring fetal development.

Potential Limitations

While this test is reliable for establishing a timeline, it does not account for potential variations in ovulation timing or early pregnancy complications. If your symptoms or ultrasound results suggest a discrepancy, your provider may use additional tests (like early ultrasound) for confirmation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Gestational Age Estimate

Frequently asked questions

Why is this test important?
This test helps your healthcare provider track your pregnancy’s progress, schedule important prenatal visits (like ultrasounds), and ensure medications are administered at the correct dosage. It also supports early detection of potential complications, such as preterm labor or chromosomal abnormalities, by providing a reference point for further testing.
What if my results differ from my expected due date?
If your estimated gestational age differs from your expected due date, your provider may order an early ultrasound to confirm the actual gestational age. This helps adjust care plans and monitor fetal development accurately.
Does this test require fasting or special preparation?
No fasting or special preparation is required. This is a simple record-keeping test based on your reported due date, so no blood, urine, or other samples are needed.
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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