A diagnostic test of the amniotic fluid to determine whether the fetus is likely to develop respiratory distress is:
a. Lecithin/sphingomyelin ratio (L/S ratio)
b. Alpha-fetoprotein (AFP)
c. Rh isoimmunization
d. Triple marker screen
ANS: A
The L/S ratio indicates fetal lung maturity, which helps determine whether the fetus is likely to have respiratory distress at birth. AFP levels are used to help identify possible congenital or genetic defects. Tests for Rh isoimmunization may be done if the mother is Rh negative and the fetus is Rh positive. Triple marker screening may be done with the AFP test to identify chromosomal abnormalities.
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