You’ve been lying on the ultrasound table for what feels like forever.
The sonographer keeps returning to your baby’s heart, changes the angle of the probe, asks you to turn onto your side, and continues taking more images.
Naturally, you start wondering:
Why is my anatomy scan taking so long?
Did they find something wrong?
Not necessarily.
An anatomy scan can take longer for many reasons, and one of the most common is simply that your baby is not in the ideal position for all the required images.
A longer ultrasound does not automatically mean an abnormality has been found.
What Happens During an Anatomy Scan?
The anatomy scan is a detailed ultrasound examination usually performed during the second trimester.
Unlike a quick ultrasound that may confirm fetal heartbeat or growth, the anatomy scan requires the sonographer to obtain multiple specific views.
Depending on local protocols, the examination may include evaluation of the:
- brain
- face
- spine
- heart
- chest
- stomach
- kidneys
- bladder
- abdominal wall
- arms and legs
The placenta, amniotic fluid, umbilical cord, and other pregnancy findings may also be assessed.
That is a lot of information to collect in one examination.
Why Does the Anatomy Scan Sometimes Take So Long?
There isn’t one reason.
Several factors can make the examination take longer.
1. Your Baby Is in a Difficult Position
This is extremely common.
Your baby may be:
- facing your spine
- curled tightly
- lying with arms across the chest
- keeping the legs crossed
- positioned low in the uterus
- staying in one position
The sonographer may know exactly which image is needed but simply not have the right angle to obtain it.
2. The Sonographer Needs Specific Views
An anatomy scan isn’t just about getting a picture that “looks like the heart” or “looks like the brain.”
Specific standardized views may be required.
That means a structure can be visible, but the sonographer may still need a different angle or imaging plane to adequately evaluate it.
This is one reason you may notice the same area being scanned repeatedly.
3. The Baby Keeps Moving
Sometimes the problem is the opposite.
Instead of refusing to move, your baby won’t stop moving.
Just as the sonographer lines up the correct image…
the baby turns.
Then the process starts again.
Fetal movement is normal, but lots of movement can make capturing precise still images more challenging.
4. The Heart Can Take Time
Parents often notice that a large portion of the anatomy scan seems to focus on the baby’s heart.
The fetal heart is small and beating quickly, and several views may be required.
If the baby’s position is not favorable, obtaining all the necessary cardiac images can take time.
This does not automatically mean a heart problem has been found.
Sometimes the sonographer is simply trying to complete the required views.
5. Some Structures Need a Better Angle
The baby’s face, spine, brain, and other structures can also be difficult to evaluate depending on fetal position.
For example, if the baby’s face is turned away, some facial views may be difficult to obtain.
If the baby’s back is positioned at an unfavorable angle, certain spinal views may require additional scanning.
Why Does the Sonographer Keep Going Back to the Same Area?
This can make parents especially nervous.
You may think:
“They’ve looked at the heart five times. Something must be wrong.”
But repeated scanning does not necessarily mean something abnormal was seen.
The sonographer may be:
- trying to obtain a specific view
- waiting for the baby to move
- improving image quality
- confirming a measurement
- documenting the required anatomy
Sometimes one stubborn image can add a significant amount of time to the examination.
Why Am I Being Asked to Turn Onto My Side?
Changing maternal position can sometimes change the baby’s position or create a different ultrasound window.
The sonographer may ask you to:
- turn onto your left side
- turn onto your right side
- sit up
- change position
- walk briefly
Then they may try again.
Sometimes this works immediately.
Sometimes the baby refuses to cooperate.
Does a Quiet Sonographer Mean Something Is Wrong?
Not necessarily.
Sonographers often need to concentrate while acquiring and documenting detailed images.
They may also be limited in what they can discuss during the examination depending on workplace policies and professional roles.
Silence alone should not be interpreted as a sign that something abnormal has been found.
Why Was Someone Else Asked to Look at the Scan?
Sometimes another sonographer, physician, or other qualified healthcare professional may review images or obtain additional views.
This can happen for different reasons.
It does not automatically mean that something serious has been found.
If there is a finding that needs discussion, your healthcare provider should explain what was seen and what happens next.
How Long Should an Anatomy Scan Take?
There is no single duration that applies to every pregnancy.
The time required can vary depending on:
- fetal position
- fetal movement
- gestational age
- number of fetuses
- imaging conditions
- which views are required
- whether additional assessment is needed
- local scanning protocols
Two people at the same gestational age can therefore have very different scan times.
What If They Can’t Finish the Anatomy Scan?
Sometimes, despite everyone’s best efforts, all required views cannot be obtained.
You may then be asked to return for another ultrasound.
This is often called a repeat or follow-up anatomy scan.
Being asked to return does not automatically mean something is wrong.
Sometimes the scan is simply incomplete because certain structures could not be adequately visualized.
Incomplete Does Not Mean Abnormal
This distinction is important.
Incomplete:
The necessary view could not be obtained well enough.
Abnormal:
A finding was seen that may require further assessment.
Those are not the same thing.
If you are asked to return and you’re unsure why, ask your healthcare provider:
“Was the scan incomplete because of the baby’s position, or is there a specific finding that needs follow-up?”
Should I Worry If My Anatomy Scan Takes a Long Time?
Try not to judge the result based on the clock.
A short scan does not guarantee that everything is normal.
And a long scan does not automatically indicate a problem.
What matters is the actual interpretation of the examination.
Key Takeaway
If your anatomy scan is taking longer than expected, don’t assume that the sonographer has found something wrong.
Your baby may simply be in a difficult position, moving frequently, or making one particular view difficult to obtain.
The anatomy scan requires many specific images, and sometimes getting those images takes patience.
And if the examination cannot be completed?
You may simply be invited back to finish the missing views.
Longer does not automatically mean abnormal.
This article is for general educational purposes and does not replace individualized medical advice from your obstetric healthcare provider.
