Gynaecology & Obstetrics Following tests are done for assessing fetal lung maturity. Which of the following test results DOES NOT indicate adequate fetal lung maturity? A Foam stability index greater than 47 B Presence of phosphatidylglycerol C Lecithin/sphingomyelin ratio less than 2 D All of the above 💡 Explanation Following tests are done for assessing fetal lung maturity. Which of the following test results DOES NOT indicate adequate fetal lung maturity? ✓ Correct Answer: C. Lecithin/sphingomyelin ratio less than 2