Gynaecology & Obstetrics Which of the following tests on maternal serum is most useful in distinguishing between open neural tube defects and ventral wall defects in tus? A Carcinoembryogenic antigen B Sphingomyelin C Alpha-feto protein D Pseudocholinesterase 💡 Explanation Which of the following tests on maternal serum is most useful in distinguishing between open neural tube defects and ventral wall defects in tus? ✓ Correct Answer: D. Pseudocholinesterase