3 doctors weighed in:

Why do I have to have an amniocentesis and not a nuchal scan to check for down's?

3 doctors weighed in
Dr. Craig Keathley
Obstetrics & Gynecology
2 doctors agree

In brief: Diagnosis/Screening

The nuchal fold measurement is a marker for down syndrome and is used in screening algorithms to assess risk for downs.
However, it is not a diagnostic test. The diagnostic test to definitively tell if you are carrying a baby with down syndrome is the amnio or cvs depending on gestational age. These test collect fetal cells that can then have the chromosomes counted.

In brief: Diagnosis/Screening

The nuchal fold measurement is a marker for down syndrome and is used in screening algorithms to assess risk for downs.
However, it is not a diagnostic test. The diagnostic test to definitively tell if you are carrying a baby with down syndrome is the amnio or cvs depending on gestational age. These test collect fetal cells that can then have the chromosomes counted.
Dr. Craig Keathley
Dr. Craig Keathley
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In brief: Don't know

Why is a 30 yo having an amniocentesis suggested in the first place? Standard practice usually offers amnio to mothers who will be 35 yrs during the pregnancy.
Is there a prior history of chromosomal abnormality which places you at higher risk? If so, then your doctor feels the definitive nature of the amnio warrants the 0.5% risk of post amnio miscarriage vs the merely suggestive nuchal scan.

In brief: Don't know

Why is a 30 yo having an amniocentesis suggested in the first place? Standard practice usually offers amnio to mothers who will be 35 yrs during the pregnancy.
Is there a prior history of chromosomal abnormality which places you at higher risk? If so, then your doctor feels the definitive nature of the amnio warrants the 0.5% risk of post amnio miscarriage vs the merely suggestive nuchal scan.
Dr. Bruce J. Stringer
Dr. Bruce J. Stringer
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