USMLE Forum Archives - USMLE Step 1 - L-S ratio
L-S ratio
bingousmle - 05-23-10 05:25
Measurement of the lecithin-sphingomyelin (L-S) ratio in amniotic fluid assesses which of the following
A.The placenta's ability to oxygenate the fetus
B.Fetal adrenal function
C.Fetal kidney development
D.Fetal brain development
E.Fetal lung maturity
bingousmle - 05-23-10 05:25
Measurement of the lecithin-sphingomyelin (L-S) ratio in amniotic fluid assesses which of the following
A.The placenta's ability to oxygenate the fetus
B.Fetal adrenal function
C.Fetal kidney development
D.Fetal brain development
E.Fetal lung maturity
The correct answer and explanation will be available after you answer.
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#2
Re: L-S ratio mtniharika - 05-23-10 15:43 My answer is: e.
As the lungs mature and become better able to produce surfactant, the ratio of lecithin to sphingomyelin increases in the amniotic fluid.
#7
Re: L-S ratio babbu5508 - 05-24-10 00:47 My answer is: e.
An L/S ratio of 2 or more indicates a relatively low risk of infant respiratory distress syndrome, and an L/S ratio of less than 1.5 is associated with a high risk of infant respiratory distress syndrome.
#8
Re: L-S ratio mtniharika - 05-25-10 04:00 Fetal lung maturity occurs during the 2 to 3 weeks period when the L/S ratio increases to 2.0 or more, PI decreases, and PG becomes detectable. Because PG appears later in gestation, it is a good indicator of maturity
#9
Re: L-S ratio galaxy - 05-26-10 02:41 My answer is: e.
Measurement of the lecithin-sphingomyelin (L-S) ratio in amniotic fluid assesses which of the following E.Fetal lung maturity
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