How should the nurse interpret a pregnant client's lecithin/sphingomyelin (L/S) ratio finding of 2:1 on amniotic fluid?
1. Fetal lungs are mature.
2. Fetal lungs are still immature.
3. The fetus has a congenital anomaly.
4. The fetus is small for gestational age.
1
Explanation:
1. A 2:1 L/S ratio indicates that the risk of respiratory distress syndrome (RDS) is very low and that the fetus's lungs are mature.
2. Early in pregnancy, the sphingomyelin concentration in amniotic fluid is greater than the concentration of lecithin, and so the L/S ratio is low if the fetus's lungs are immature, which is not the case in this instance.
3. The L/S ratio is not a measurement for congenital anomalies.
4. The L/S ratio is not a measurement for size of the fetus.
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