Estimated Fetal Weight via GA and Maternal Measurements (Growth Assessment)
This test uses your gestational age and certain maternal measurements to estimate how large your baby may be inside the womb.
["Helps healthcare providers monitor fetal growth and plan care during pregnancy."]
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?
How often will I need this test?
Can I affect the accuracy of this estimate?
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 16, 2026. · Read our editorial policy