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Clinical Chemistry 32: 255-259, 1986;
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Clinical Chemistry, Vol 32, 255-259, Copyright © 1986 by American Association for Clinical Chemistry

Improved fluorescence polarization assay for use in evaluating fetal lung maturity. II. Analytical evaluation and comparison with the lecithin/sphingomyelin ratio

CA Foerder, JF Tait, RW Franklin and ER Ashwood

We assessed the analytical performance of an improved fluorescence polarization assay for use in evaluating fetal lung maturity and compared results with the lecithin/sphingomyelin ratio. During a three- month period 150 patients' samples were assayed by clinical laboratory personnel with both techniques. Values for the lecithin/sphingomyelin ratio correlate closely with net fluorescence polarization values (r = - 0.85), less closely with net fluorescence intensity (r = 0.65). Background fluorescence intensity and polarization varied widely, indicating a need to correct measurements for endogenous fluorescence. Net fluorescence polarization values have a CV of 0.32% within-run, 1.07% between-day. A comparison of two amniotic fluid centrifugation procedures showed no significant difference in such values. For both methods, however, such values are slightly but significantly higher than those obtained for amniotic fluids without prior centrifugation. Short-term storage (less than 30 days) of uncentrifuged amniotic fluid samples at -20 degrees C does not significantly affect results.


The following articles in journals at HighWire Press have cited this article:


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 Obstet GynecolHome page
S. S. Srouji, D. B. Carr, C. M. Gardella, T. Benedetti, and J. F. Tait
The Effect of Common Clinical Contaminants on Amniotic Fluid Fluorescence Polarization Results
Obstet. Gynecol., December 1, 2004; 104(6): 1237 - 1243.
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