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19971: Lecithin/sphingomyelin Ratio W/ Qualitatitve Phosphatidyl G Print View
Lecithin/Sphingomy. Ratio TLC     
Phosphatidyl Glycerol TLC     

PRIMARY
1 Amniotic Fluid 6 (4) mL   Frozen - 14 Day(s)  
ALTERNATE

In the early stages of gestation, phosphatidylinositol is not present in amniotic fluid. At about 32-33 weeks of gestation, lecithin and sphingomyelin concentrations are about equal; subsequently, the lecithin concentration rises and paralleling this, the concentration of another phospholipid, phosphatidylinositol, also rises. At 36 weeks of gestation, however, the phosphatidylinositol concentration begins to decrease and phosphatidylglycerol begins to appear in the amniotic fluid. It is this appearance of phosphatidylglycerol that suggests the presence of a mature fetal lung. Respiratory distress syndrome (RDS) a lecithin/sphingomyelin (L/S) ratio of greater than 2:1, together with a quantity of phosphatidylglycerol (PG) greater than or equal to 2.0%, may suggest mature fetal lung development.

If red blood cells are present, do NOT freeze before centrifuging
140 x g for 10 minutes. Submit supernatant fluid. Send frozen samples
on dry ice.
Setup Schedule
Sunday-Saturday

Reported (Analytical Time)
Same day

CPT Codes
83661,82489

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Transport Temperature: Frozen Methodology: Thin-Layer Chromatography






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