Which of the following statements are true of the lecithin-to-sphingomyelin ratio?
I.It is predictive of fetal lung maturation.
II.An L/S ratio greater than 2:1 indicates fetal lung maturity in nondiabetic pregnancies.
III.The L/S ratio is falsely high in diabetes.
IV.The L/S ratio is generally 2:1 at 35 weeks' gestation.

Question

Quizplus · Accepted Answer

The ratio of lecithin to sphingomyelin (L/S ratio) in amniotic fluid is predictive of fetal lung maturation. An L/S ratio greater than 2:1 indicates fetal lung maturity in nondiabetic pregnancies. (The L/S ratio is falsely high in diabetes.) The L/S ratio is generally 1:1 at 31 to 32 weeks' gestation, and 2:1 at 35 weeks.

Which of the Following Statements Are True of the Lecithin-To-Sphingomyelin