The Mother of a 6-Month-Old Would Like to Have Her

Multiple Choice

The mother of a 6-month-old would like to have her child tested for Tay-Sachs disease because of a family history of this inherited disorder.Which test would be most appropriate for this purpose?

A) Homovanillic acid (HVA)
B) 5-Hydroxyindoleacetic acid (5-HIAA)
C) Homocysteine and methylmalonic acid
D) Hexosaminidase A and B