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.
2 - 3 days
- Phosphatidylglycerol (PG)
- Lecithin/Sphingomyelin Ratio
- Lecithin / Sphingomyelin Ratio
- Fetal Lung Maturity
- L/S Ratio
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).
Test includes Lecithin/Sphingomyelin (L/S) ratio and phosphatidylglycerol. Test sent to Mayo Medical Laboratories.