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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is Femur Length Of 51,7mm Normal In Fetal Ultrasound?

Hi, I went for a 4D morphology ultrasound and after seeing the images my mind is playing tricks on me as to if the baby could possibly be a downs baby... our risk was 1:309 whick scares me and during yesterdays ultrasound results of, femur length 51.7mm BPD 71.2mm HC 261.7mm does this seem normal or should i get a second oppinion?
Mon, 23 Nov 2015
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OBGYN,  's  Response
Hi,

Please do not worry. A 4D ultrasound helps identify structural defects in the baby and since none are identified, do not be worry. Sometimes the scan look different from what we expect them to show.
The radiologist would have definitely informed you if he felt any concerns.
Also, a risk of 1:309 for Downs is a very low risk and you need to worry only if your risk was less than 1/100.
The measurements you have posted if with the estimated gestational age, it would have helped better understanding. Any gross abnormality in measurements is generally commented by the radiologist.
Do not worry.
Ultrasound make it easier to identify abnormalities, do not get anxious because of it.

Hope this helps.
Regards.
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Is Femur Length Of 51,7mm Normal In Fetal Ultrasound?

Hi, Please do not worry. A 4D ultrasound helps identify structural defects in the baby and since none are identified, do not be worry. Sometimes the scan look different from what we expect them to show. The radiologist would have definitely informed you if he felt any concerns. Also, a risk of 1:309 for Downs is a very low risk and you need to worry only if your risk was less than 1/100. The measurements you have posted if with the estimated gestational age, it would have helped better understanding. Any gross abnormality in measurements is generally commented by the radiologist. Do not worry. Ultrasound make it easier to identify abnormalities, do not get anxious because of it. Hope this helps. Regards.