report is suggestive of a normal viable intrauterine pregnancy
of about 17-18 weeks, except that the estimated fetal weight is a little higher. Cervical length is also normal. Ultrasound report alone cannot diagnose Down's syndrome, it needs to have an amniocentesis
or CVS to confirm the diagnosis. Perhaps your doctor wanted to be sure, he is the better judge in your case. Down's syndrome is ruled out even without any hint when a woman conceives in late age,i.e., in the forties'. Wish you good health.