I conceived with 2nd baby. Double marker test shows high risk for down syndrome 1: 131.undergone amniocentesis. Fish study reveal no aneuploidy. It was normal. 2 wkks later revealed, your sample is unable to yield analysing metaphase. Culture failure. Now what should I do? No previous history. Scan was normal. They r telling there is no reason. They ask me to provide sample if I wish. To re test.