RELATION BETWEEN OPTICAL-DENSITY AT 650-NM AND L-S RATIOS

  • 1 January 1977
    • journal article
    • research article
    • Vol. 50  (6) , 723-724
Abstract
A simple and rapid test that correlates with L/S [lecithin/sphingomyelin] ratios was developed. By centrifuging fresh, unfrozen human amniotic fluids at 2000/g for 10 min and measuring the optical density at 650 nm, correlation with L/S ratios was obtained. Optical density readings of 0.15 or greater correlate 100% with L/S ratios of 2.0 or greater. Optical readings below 0.15 correlate 94% with L/S ratios below 2.0.

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