Task: Answer Verification
Input (English): Question: Are 2nd-trimester maternal serum marker results altered by delayed analysis?
Answer: Our data suggest that up to a 14-day delay in the performance of the 2nd-trimester maternal serum biochemical screening assays will not alter the results significantly. The results of maternal serum screening are, thus, clinically valid even if the laboratory assays were performed several days after maternal blood was drawn.
Output (English): no