2 - 3 days
Lecithin / Sphingomyelin Ratio
Fetal Lung Maturity
Looking to order a test?
We’ve provided helpful links to make ordering easy.Find a Requisition
All specimens should be accompanied by a requisition.Submitting Specimens
Learn about how to properly label and where to ship specimens.Order Kits and Supplies
MLabs provides all the supplies necessary for the collection of specimens.Test FAQ
Visit our provider FAQ and learn about common questions to ordering tests.
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.
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).