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Estimated Fetal Weight via GA and Maternal Measurements (Growth Assessment)

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

This test uses your gestational age and certain maternal measurements to estimate how large your baby may be inside the womb.

Quick summary

["Helps healthcare providers monitor fetal growth and plan care during pregnancy."]

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

Key facts at a glance

LOINC
33163-7
Short code
Fet Weight from GA.Hansmann86
Synonyms
Fet Weight from GA.Hansmann86
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-estimated-from-hansmann
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 the Test Works

Your healthcare provider will use a combination of your due date (gestational age) and measurements like your height, weight, and possibly ultrasound results to calculate an estimated fetal weight. This method relies on statistical models that correlate these factors with typical fetal development.

Why It’s Done

This test is often used during pregnancy to check if your baby is growing at a healthy rate. It helps identify potential issues early, such as growth restriction or excessive fetal size, which may require additional monitoring or medical intervention.

Sample Collection

No specific blood, urine, or other bodily fluid sample is taken for this test. Instead, measurements are obtained through physical exams (like height and weight) and sometimes an ultrasound. Your healthcare provider will discuss how these measurements are used to estimate fetal weight.

What to Expect

You may have this test during routine prenatal visits, especially if you have a history of complications or if your provider wants to monitor fetal growth closely. It’s a quick, non-invasive process and doesn’t require preparation beyond attending your scheduled appointment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fetal Weight Estimate

Frequently asked questions

What does this test tell me about my pregnancy?
An estimated fetal weight helps your healthcare provider assess whether your baby is growing as expected. If the estimate suggests potential concerns (like slow growth or large size), further testing or closer monitoring may be recommended to ensure both your and your baby’s health.
How often will I need this test?
The frequency depends on your pregnancy status and any risks involved. Some women may have this test once or twice during pregnancy, while others with higher-risk pregnancies might have it more often. Always follow your provider’s guidance.
Can I affect the accuracy of this estimate?
While no single test is perfect, factors like accurate gestational dating, consistent measurements, and a healthy pregnancy can improve the reliability of the estimate. If you have concerns, discuss them with your provider—they can help clarify results and next steps.
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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