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Ultrasound Examination of Gravid Uterus (Pregnancy Ultrasound)

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

This test uses sound waves to create images of your uterus and baby during pregnancy to check for growth, health, and development.

Quick summary

["A pregnancy ultrasound helps monitor your baby’s progress and detect potential issues early."]

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

Key facts at a glance

LOINC
12157-4
Short code
Ultrasonographer grav #
Synonyms
Ultrasonographer grav #
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Doctors may recommend a pregnancy ultrasound at different stages to assess fetal development, check for complications like miscarriage risk, or evaluate the placenta and amniotic fluid. It’s also used to confirm pregnancy, determine the due date, or identify abnormalities in the uterus or fetus.

What to Expect During the Procedure

You’ll lie on your back on an exam table with a gel applied to your belly. A transducer (a handheld device) glides over your skin to capture images. The procedure is painless and usually takes 15–30 minutes. You may need to drink water beforehand to help the ultrasound see your bladder.

Common Uses of a Pregnancy Ultrasound

Common reasons include confirming pregnancy viability, measuring fetal growth, checking for multiple pregnancies, assessing placental position, or identifying signs of complications like preterm labor or gestational diabetes.

Safety and Preparation

Ultrasounds are safe for pregnancy as they use non-ionizing sound waves. No special preparation is needed, but your doctor may advise avoiding certain foods or drinks if the test focuses on the bladder.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Pregnancy Ultrasound

Frequently asked questions

How Might Results Affect My Care?
Results may reveal normal development, potential risks (e.g., low amniotic fluid, fetal position issues), or need for further testing. Your doctor will discuss findings and next steps based on your specific situation.
What If I Have Concerns About the Ultrasound?
Ultrasounds are generally safe and widely used. If you have concerns about radiation (though irrelevant here) or discomfort, discuss them with your healthcare provider. Some women feel pressure or mild cramping during the procedure, but it’s usually not painful.
Can I Eat or Drink Before the Test?
Most pregnancy ultrasounds don’t require fasting. If the test involves bladder imaging (e.g., for placental position), drink water beforehand to fill your bladder for clearer images. Always follow your doctor’s specific instructions.
  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