ARUP's Laboratory Test Directory

Lecithin-Sphingomyelin Ratio : 0080200

Mnemonic: L-S

Methodology: Quantitative Chromatography
Performed: Sun-Sat
Reported: Within 30 hours
Specimen Required: Patient Prep: Amniocentesis preferred.

Collect: Amniotic fluid.

Specimen Preparation: Do not centrifuge. Transport 10 mL amniotic fluid. (Min: 4 mL)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): Ambient: 1 hour; Refrigerated: 48 hours; Frozen: 1 year
Reference Interval:
Mature fetal lung: 2.5 or greater
Transitional fetal lung: 1.6-2.4
Immature fetal lung: 1.5 or less
Note: LS run starts at 1:00 p.m. daily.  Stat testing must be approved by the pathologist on call after 5:00 p.m.
CPT Code(s): 83661
Cross References: L/S (Lecithin-Sphingomyelin Ratio), LS Ratio (Lecithin-Sphingomyelin Ratio)
 
 

 

 

 
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