How Long Does an Ultrasound Take?

Quick Answer

Most ultrasound exams take 15–45 minutes, though the exact time depends on the type of scan and what the sonographer needs to visualize. A routine pregnancy ultrasound takes 20–30 minutes. An abdominal ultrasound runs 15–30 minutes. More complex exams like echocardiograms (heart ultrasounds) can take 30–60 minutes.

Ultrasound Times by Type

Type	Duration	Purpose
Pregnancy (standard)	20–30 min	Fetal development, anatomy
Pregnancy (anatomy scan, 20-week)	30–45 min	Detailed organ check
Abdominal	15–30 min	Liver, gallbladder, kidneys, pancreas
Pelvic (transabdominal)	15–30 min	Uterus, ovaries, bladder
Pelvic (transvaginal)	15–20 min	Closer view of reproductive organs
Echocardiogram (heart)	30–60 min	Heart valves, chambers, blood flow
Thyroid	15–20 min	Thyroid gland, nodules
Breast	15–30 min	Lumps, cysts, follow-up to mammogram
Renal (kidney)	15–20 min	Kidney size, stones, blockages
Doppler (vascular)	30–45 min	Blood flow in arteries and veins
Musculoskeletal	15–30 min	Tendons, muscles, joints

Pregnancy Ultrasounds

Pregnancy ultrasounds are the most common type and typically happen at specific milestones:

• First trimester (6–12 weeks) — confirms pregnancy, checks heartbeat, dates the pregnancy. Takes 15–20 minutes (transvaginal) or 20–30 minutes (transabdominal).
• Anatomy scan (18–22 weeks) — the most detailed prenatal ultrasound, examining the baby's brain, heart, spine, limbs, and organs. Takes 30–45 minutes. If the baby is not in a good position, you may be asked to walk around and return for additional images.
• Third trimester (28–36 weeks) — checks growth, fluid levels, and position. Takes 20–30 minutes.
• 3D/4D ultrasound — elective imaging for bonding; takes 15–30 minutes.

Abdominal Ultrasound

An abdominal ultrasound examines the liver, gallbladder, spleen, kidneys, and pancreas. It typically takes 15–30 minutes.

Preparation:

• Fast for 8–12 hours before the exam (food causes the gallbladder to contract, making it harder to image)
• You may be asked to drink water beforehand to fill the bladder for better visualization
• Wear loose, comfortable clothing

Echocardiogram (Heart Ultrasound)

An echocardiogram takes 30–60 minutes and is the longest common ultrasound type. The sonographer captures the heart from multiple angles to evaluate chamber size, valve function, and blood flow. A transesophageal echocardiogram (TEE) takes 30–45 minutes but requires sedation and 1–2 hours of recovery time.

What to Expect During an Ultrasound

1. Check in — arrive 10–15 minutes early to complete paperwork
2. Preparation — you may change into a gown depending on the exam
3. Gel application — the sonographer applies warm gel to the skin over the target area
4. Scanning — a transducer is pressed against the skin and moved to capture images. You may feel mild pressure but no pain.
5. Image capture — the sonographer takes measurements and still images. They may ask you to hold your breath, change positions, or wait while they get additional views.
6. Clean up — gel is wiped off. You can resume normal activities immediately.

Factors That Affect Duration

• Patient body habitus — more adipose tissue can make imaging harder, requiring additional time
• Baby's position — during pregnancy scans, an uncooperative baby may extend the exam
• Complexity of findings — if something unexpected is found, the sonographer may take extra images
• Fasting compliance — a non-empty stomach can obscure the gallbladder
• Full vs. empty bladder — pelvic exams need a full bladder; an insufficiently full bladder may delay the start

Tips

• Follow prep instructions exactly — fasting and hydration requirements exist for a reason
• Wear two-piece clothing — makes it easier to expose the scan area
• Book morning appointments for fasting exams so you are not hungry all day
• Results timeline — routine results are usually available within 1–3 business days; urgent findings may be communicated the same day
• Relax — ultrasound uses sound waves, not radiation; it is completely painless and safe