© Copyright 2026 American Medical Association. All rights reserved.
A fetal lung maturity assessment is a critical evaluation performed to determine the readiness of a fetus's lungs for breathing air after delivery. This assessment can be conducted using various methods, including the foam stability test (CPT® Code 83662), fluorescence polarization (CPT® Code 83663), and lamellar body density (CPT® Code 83664). These tests analyze amniotic fluid collected before delivery to assess the likelihood of neonatal respiratory distress syndrome (RDS), also known as hyaline membrane disease, which can occur if the lungs are not sufficiently mature. The results of these assessments are vital in guiding clinical decisions regarding the management of premature labor; they help healthcare providers decide whether to attempt to suppress labor or to proceed with delivery based on the maturity of the fetal lungs. Additionally, the tests may be indicated in situations where there are complications affecting the health of the mother and/or fetus, allowing for informed decisions about the timing of labor induction. The foam stability index (FSI) specifically measures the function of surfactant in the amniotic fluid, providing a quantitative assessment of lung maturity that is essential for ensuring the best possible outcomes for both the mother and the newborn.
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