2 - 3 days
Lecithin / Sphingomyelin Ratio
Fetal Lung Maturity
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Amniotic fluid test for fetal maturity, indicator to determine optimal time for obstetrical intervention in cases of possible fetal distress (maternal diabetes, toxemia, isoimmune hemolytic disease, postmaturity).
IMMATURE: L/S <2.5, Phosphatidylglycerol Absent; INDETERMINATE: L/S >=2.5, Phosphatidylglycerol Absent or L/S <2.5, Phosphatidylglycerol Trace; MATURE: L/S >=2.5, Phosphatidylglycerol Trace or L/S Any Ratio, Phosphatidylglycerol Present.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Amniotic fluid. Send sample to the laboratory IMMEDIATELY after collection. Fetal Lung Maturity screening test will be performed before L/S ratio is run; L/S ratio is not indicated if FLM is > or = 55mg/gm. Cause for Rejection: Specimen contaminated with blood.
Collect amniotic fluid. Centrifuge at 1000 rpm or 200 x G for 10 minutes, aliquot supernatent into a plastic tube and send both supernatent and sediment frozen. Label specimens appropriately, "supernatent" and "sediment". Include estimated duration of pregnancy (in weeks).