A member asked:

Can a fragile x pcr blood test determine the sex of the fetus? my results say:female, 28 and 29 cgg repeats (negative).

3 doctors weighed in across 2 answers

No, just mutation.: The sex of the fetus is determined by karyotyping/cytogenetic analysis. This test determines the extent of the trinucleotide repeat mutation using southern blot analysis. By determining the number of cgg repeats on the x chromosome, this method allows for more accurate assessment of risk for premutation carriers in terms of their own risk of these syndromes, and of having affected children.

Answered 2/28/2014

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Depends: What was tested? If you had amniocentesis for the test, then it can determine the sex of the baby. Even cell free DNA testing of plasma can reveal the sex of the baby.

Answered 1/27/2019

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