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 |