LECITHIN-SPHINGOMYELIN (L/S) RATIO AMNIOTIC FLUID
General Information
HLAB/HOL Code: LS
UPHSM LIS Test #: 284
Schedule: Monday-Friday
Testing Time: 1 day
Testing Lab: UP Health System-Marquette
UPHSM LIS Test #: 284
Schedule: Monday-Friday
Testing Time: 1 day
Testing Lab: UP Health System-Marquette
Specimen Info
Only 1 specimen type required, unless otherwise specified
Volume: 10 mL
Temperature: Frozen
Tube Type: Amniotic fluid
Collection Info:
Centrifuge at 1,000 rpm for 3-5 minutes, separate supernatant, and immediately transport to laboratory in a screw-capped, sterile vial. Send specimen frozen if there is a delay in transport to the laboratory.
Temperature: Frozen
Tube Type: Amniotic fluid
Collection Info:
Centrifuge at 1,000 rpm for 3-5 minutes, separate supernatant, and immediately transport to laboratory in a screw-capped, sterile vial. Send specimen frozen if there is a delay in transport to the laboratory.
Methods
Thin-Layer Chromatography (TLC)
Includes L/S ratio and foam stability index (FSI).
Includes L/S ratio and foam stability index (FSI).
CPT Codes
83661
* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
Reference Range
L/S ratio of >2.0 is consistent with fetal lung maturity.
FSI >0.47 is consistent with fetal lung maturity.
FSI >0.47 is consistent with fetal lung maturity.
