Preparation guide

Preparation for obstetric ultrasound

Public guide to confirm LMP, EDD, bladder, exam route, documents, and warning signs before an obstetric ultrasound.

How to use this guide

Obstetric preparation changes according to gestational age and examination technique. In some cases, a full bladder helps; in others, it does not.

Bring the estimated gestational age, previous ultrasound exams, relevant tests, and any instruction received during prenatal care.

This material summarizes the most common preparation, but the final instruction must always be confirmed with the clinic or the requesting physician.

What is commonly requested for this exam

• Confirm with the clinic whether the exam will be abdominal, transvaginal, or combined.
• Bring previous ultrasounds, prenatal records, and relevant laboratory tests.
• Inform the team about pain, bleeding, fever, or reduced fetal movement when applicable.

Quick checklist

• Confirm whether fasting, water intake, full bladder, empty bladder, or a specific time is required.
• Bring the medical request, ID, insurance information, and related prior exams.
• Do not stop medications on your own.
• Inform the clinic about pregnancy, diabetes, mobility limitation, severe pain, or anticoagulant use.

Useful questions to confirm with the clinic

• Do I need to fast? For how many hours?
• Should I drink water? How much and until when?
• Do I need a full or empty bladder?
• Is there different guidance for children, elderly patients, pregnancy, or diabetes?

Other useful preparation guides

• Preparo para ultrassom
• Transvaginal
• Pelvic

Published preparation guides

• Complete Abdominal
• Breasts
• Thyroid
• Obstetric
• Pelvic
• Transvaginal
• Urinary Tract
• Venous Doppler

Obstetric

Pregnancy

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