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Fetal Kidney Renal Volume Measurement (Ultrasound-Derived)

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

This test measures the size of your baby’s kidneys using ultrasound to help assess kidney development during pregnancy.

Quick summary

["Your provider may use this test to monitor kidney growth in early fetal development."]

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

Key facts at a glance

LOINC
12163-2
Short code
Fet Kidney-R Volume der US
Synonyms
Fet Kidney-R Volume der US
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-derived
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 recommend this test if you’re at higher risk for conditions like fetal kidney abnormalities, genetic disorders, or if your pregnancy is in the early stages (typically around 16–24 weeks). It helps ensure your baby’s organs are developing normally.

What to Expect During the Test

You’ll lie on an exam table with a gel applied to your abdomen. A transducer (probe) will move gently over your belly to capture images of your baby’s kidneys. The test usually takes about 15–30 minutes and is painless.

How Results Are Interpreted

Results are compared to standard fetal kidney volume measurements for your gestational age. Abnormal findings may prompt further evaluation, such as additional ultrasounds or genetic testing.

Common Reasons for Abnormal Results

Low fetal kidney volume might indicate potential developmental concerns, while very high volumes could signal conditions like polycystic kidney disease. Your provider will discuss findings with you and may recommend next steps.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Early detection of kidney-related issues can help guide prenatal care, especially if you have a family history of kidney disorders or other risk factors. This test is a non-invasive way to monitor organ development and ensure your baby’s overall health.

Short name

Fetal Kidney Volume

Frequently asked questions

Will this test hurt?
No, the ultrasound is completely painless. You may feel a slight pressure or warmth where the gel is applied, but no discomfort.
How soon will I get my results?
Results are typically available within a few days to a week, depending on your healthcare provider’s workflow. Your provider will discuss them during your next prenatal visit.
Can I eat or drink before this test?
No special preparation is needed. You can eat and drink normally before the ultrasound, as it doesn’t require fasting.
  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