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Absolute risk of respiratory distress syndrome based on TDx FLM II ratio (mg/g) and gestational age*

Absolute risk of respiratory distress syndrome based on TDx FLM II ratio (mg/g) and gestational age*
FLM Gestational age, weeks
29 30 31 32 33 34 35 36 37 38 39
10 98% 97% 96% 95% 92% 89% 85% 80% 73%    
20 94% 92% 89% 85% 80% 73% 65% 57% 47% 38%  
30 85% 79% 73% 65% 56% 47% 38% 30% 23% 17% 12%
40 64% 55% 46% 37% 29% 22% 17% 12% 8.7% 6.2% 4.4%
50 37% 29% 22% 16% 12% 8.5% 6.1% 4.3% 3.0% 2.1% 1.5%
60 16% 12% 8.4% 6.0% 4.2% 3.0% 2.1% 1.4% 1.0% 0.70% 0.49%
70 5.8% 4.1% 2.9% 2.0% 1.4% 0.98% 0.68% 0.47% 0.33% 0.23% 0.16%
80 2.0% 1.4% 0.96% 0.67% 0.46% 0.32% 0.22% 0.16% 0.11% 0.07% 0.05%
90   0.45% 0.31% 0.22% 0.15% 0.11% 0.07% 0.05% 0.04% 0.02% 0.02%
100     0.10% 0.07% 0.05% 0.03% 0.02% 0.02% 0.01% <0.01% <0.01%
* These risk estimates reflect the prevalence pattern of respiratory distress syndrome across the gestational age range observed in the current study data. The overall prevalence of respiratory distress syndrome in a clinical setting depends on both the prevalence of respiratory distress syndrome at each gestational age and on the distribution of gestational ages encountered.
Reproduced with permission from: Parvin CA, Kaplan LA, Chapman JF, et al. Predicting respiratory distress syndrome using gestational age and fetal lung maturity by fluorescent polarization. Am J Obstet Gynecol 2005; 192:199. Copyright © 2005 Elsevier.
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