Lecithin-Sphingomyelin Ratio (Amniotic Fluid)
In a normal pregnancy, the amount of lecithin in the amniotic fluid continues to rise. But the amount of sphingomyelin stays about the same. Your doctor will compare the amount of each surfactant. This …
Lecithin Sphingomyelin Ratio - PubMed
Mar 27, 2025 · The lecithin-to-sphingomyelin ratio (L/S ratio) is one of several methods used to assess fetal lung maturity (FLM). First introduced in the 1970s, this biochemical test requires amniotic fluid …
Assessment of Fetal Lung Maturity - Warde Medical Laboratory
The first widely accepted direct test for assessment of fetal pulmonary status was the L/S ratio. This test evaluates a change in the relative amounts of lecithin (phosphatidyl choline) and sphingomyelin (a …
Lecithin–sphingomyelin ratio - Wikipedia
The lecithin–sphingomyelin ratio (L/S ratio or L-S ratio) is a test of fetal amniotic fluid to assess for fetal lung immaturity. [1][2][3] Lungs require surfactant, a soap-like substance, to lower the surface …
14: Amniotic Fluid Analysis
By far the most frequently performed tests on amniotic fluid in the clinical laboratory are used to assess fetal lung maturity (FLM) and fetal anemia resulting from an isoimmune disease, which are discussed …
Lecithin Sphingomyelin Ratio and Fetal Lung Maturity
Jul 22, 2025 · The Lecithin-Sphingomyelin (L/S) ratio is a laboratory test performed on amniotic fluid to evaluate fetal lung maturity. This assessment analyzes specific lipids to determine the risk of a …
Chapter 12: Lesson - Development of Fetal Body Systems
Fetal lung maturity is determined by the measurement of lecithin to sphingomyelin. An L/S ratio of 2:1 typically indicates that the fetus will transition to extrauterine life with minimal respiratory difficulty.
Amniotic fluid lecithin/sphingomyelin ratio - Allina Health
What is this test? This test is done to measure the ratio of lecithin/sphingomyelin (L/S) in amniotic fluid. It is used to evaluate and manage fetal lung immaturity. This is when the unborn baby's lungs are not …
Lecithin-to-Sphingomyelin Ratio: Essential Test for Fetal Lungs
The lecithin-to-sphingomyelin ratio (L/S ratio) is a vital diagnostic tool used during pregnancy to evaluate fetal lung maturity. This test measures the levels of two surfactants—lecithin and sphingomyelin—in …
Fetal Lung Maturity - FPnotebook.com
Fetal Lung Maturity Aka: Fetal Lung Maturity, Lecithin to Sphingomyelin ratio, L/S ratio, Phosphatidylglycerol, Phosphatidylinositol, Total Surfactant Activity