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Fetal Bladder Volume Measurement (Prevoid, Urine-Based)

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

This test estimates the volume of urine in your baby’s bladder before they urinate, using ultrasound. It helps assess hydration and bladder function during pregnancy.

Quick summary

["A prevoid bladder volume check supports prenatal care by ensuring your baby’s bladder is functioning normally before birth."]

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

Key facts at a glance

LOINC
12169-9
Short code
Fet Bladder Vol pre void US.meas
Synonyms
Fet Bladder Vol pre void 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 recommend this test if you’re at higher risk for conditions like oligohydramnios (low amniotic fluid) or if your baby’s bladder has been previously identified as underfilled. It’s also sometimes used to monitor bladder function during pregnancy.

What to Expect During the Test

You’ll lie on your back on an exam table while an ultrasound probe is gently placed on your abdomen. The technician will guide the probe to visualize your baby’s bladder before they urinate. The test is quick and painless, typically taking about 10–15 minutes.

How the Results Are Interpreted

Results are compared to standard measurements for fetal bladder volume at your gestational age. A lower-than-expected volume may signal further evaluation, while a normal volume suggests typical bladder function. Your provider will discuss findings with you.

Common Causes for Concern

While most prevoid bladder volume measurements are normal, unusually low volumes may raise concerns about hydration, kidney function, or structural issues. Your provider will consider the context (e.g., pregnancy history, risk factors) when interpreting results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Fetal Bladder Volume Prevoid

Frequently asked questions

What questions might you have about this test?
This test is primarily a screening tool to monitor fetal bladder health. It doesn’t diagnose specific conditions alone but may prompt additional tests (e.g., amniotic fluid analysis, fetal ultrasound) if needed. Always ask your provider about next steps based on your results.
Will this test affect my baby’s development?
No, this ultrasound-based test is safe and does not impact your baby’s development. It’s a standard part of prenatal care to ensure everything is progressing as expected.
How soon will I get my results?
Results are typically reviewed by your healthcare provider within a few days. They’ll share findings during your next prenatal visit or by phone if urgent.
  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