All of the following amniotic fluid lab findings would indicate mature fetal lungs EXCEPT:
a. S:A ratio is >55.
b. PG is present.
c. L:S ratio is 2:1.
d. L:S ratio is 1:2.
D
An L:S ratio of 1:2 (anything less than a 2:1 ratio) would indicate immature lungs and increased risk of RDS. Mature fetal lungs are indicated by an S:A ratio of >55, the presence of PG, and an L:S ratio of 2:1 or greater.
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