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Lecithin-Sphingomyelin Ratio (Inactive as of 11/14/16)
0080200
Ordering Recommendation
Mnemonic
L-S
Methodology
Quantitative Chromatography
Performed
Sun-Sat
Reported
Within 30 hours
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Amniocentesis preferred. 
Collect
Amniotic fluid. 
Specimen Preparation
Do not centrifuge. Transport 10 mL amniotic fluid. (Min: 4 mL) 
Storage/Transport Temperature
Refrigerated. 
Unacceptable Conditions
Specimens grossly contaminated with blood, mucus, meconium, or urine, are unacceptable due to interference. 
Remarks
 
Stability
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
Interpretive Data


Note
LS run starts at 1:00 p.m. daily. Stat testing must be approved by the pathologist on call.
CPT Code(s)
83661
Components
Component Test Code*Component Chart NameLOINC
0080200Lecithin-Sphingomyelin Ratio14976-5
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • fetal lung maturity
  • FLM
  • L-S ratio
  • L/S
  • L/S Ratio
  • LS
  • LS Ratio