Lecithin-Sphingomyelin Ratio
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
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
  
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 Name
0080200Lecithin-Sphingomyelin Ratio
* 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 Ratio