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Fetal Liver Long Diameter Measurement (Ultrasound)

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

This test measures the length of your baby’s liver using ultrasound during pregnancy. It helps assess fetal development and detect potential growth issues.

Quick summary

["An ultrasound check of your baby’s liver size can help monitor healthy growth during pregnancy."]

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

Key facts at a glance

LOINC
11838-0
Short code
Fet Liver Long diameter US.meas
Synonyms
Fet Liver Long diameter US.meas
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-measured
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

Your healthcare provider may order this test if you have concerns about your baby’s growth, such as signs of delayed development, recurrent pregnancy loss, or other pregnancy-related complications. It may also be part of routine fetal monitoring in certain cases.

What to Expect During the Test

You’ll lie on an exam table while a technician applies a gel to your abdomen. A transducer is placed on your skin to send and receive sound waves. The technician moves the transducer around your belly to measure the liver’s length. The process is painless and typically takes about 15–30 minutes.

What the Results Mean

The measurement is compared to standard fetal liver size charts based on gestational age. If the liver appears unusually small or large, further evaluation may be needed to check for conditions like intrauterine growth restriction or other fetal concerns.

Common Reasons for Abnormal Results

While liver size alone rarely indicates a serious issue, abnormal measurements may prompt additional tests, such as Doppler ultrasound for blood flow or genetic screening. Always discuss results with your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fetal Liver Size Check

Frequently asked questions

How often will I need this test?
This test is usually done once during pregnancy, often around 20–24 weeks, but timing varies by provider. If your pregnancy has specific risks, you may need it earlier or more frequently.
What if my liver measurement is different from what’s expected?
If your measurement is outside the typical range, your provider will review it with you. They may recommend further imaging, blood tests, or monitoring to ensure your baby’s health. Rest assured, most measurements fall within normal limits.
Can I eat or drink before this test?
No special preparation is needed. You can eat, drink, and move around as usual. However, bring your ultrasound results or any recent pregnancy updates to share with your provider.
  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