MCQ – 73730

Karyotyping of the fetus can be done through all of the following invasive methods except:

A.	Chorionic villus sampling
B.	Cordocentesis
C.	Amniocentesis
D.	Fetal skin biopsy

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Correct Answer � D Explanation

Ans.D. Fetal skin biopsy 

Currently, there are three routine ways of obtaining fetal tissue:

1. Amniocentesis at 15 to 20 weeks of gestation.
2. Chorionic villus sampling at 10 to 12 weeks.
3. Percutaneous umbilical blood sampling (cordocentesis) past 18 weeks.