Prediction of fetal lung immaturity using gestational age, patient characteristics and fetal lung maturity tests: a probabilistic approach

Lamellar body count

The lamellar body count is a test for assessing fetal lung maturity.

Lecithin–sphingomyelin ratio

The lecithin–sphingomyelin ratio (aka L-S or L/S ratio) is a test of fetal amniotic fluid to assess for fetal lung immaturity.