ARUP's Laboratory Test Directory

0080200: Lecithin-Sphingomyelin Ratio

Test Mnemonic: L-S
Methodology: Chromatography

Performed: Sun-Sat

Reported: Within 24 hours

Specimen Required:  
Collect: Amniotic fluid.  Amniocentesis fluid preferred.  Do not centrifuge.

Transport: 10 mL amniotic fluid at 2-8°C.  (Min: 4 mL)

Stability: Ambient: 1 hour; Refrigerated: 2 days; 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

 

 

 
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