It may be different for other places but I'm a first time mom. They did blood work before 12 weeks. Then again in the second trimester. They also checked the fluid behind the neck which can be a indicator at my anatomy scan around 14 weeks.
My dr told me to decide by 18 weeks..but they would test at 22 or 23 weeks. I dont know if that is standard. My dr seems to be very cautious about doing anything too early.
I know everywhere is different, with mine its really your choice unless the doctor thinks it's necessary.. but I decided to get it done and they test before 18 weeks got mine done around 12 weeks. . If he hasn't metioned it at this point I would just go ahead and ask.
I did the triple test at 12 weeks and I'll have a special ultrasound at 22 weeks. This week - 19 - they did a blood test as well. I see my dr every month.
I was told by my doctor that genetic testing is done between 11-13 weeks. He only mentioned it because I have HME syndrome thats hereditary. I didnt do it though.
At yur next appointment if they don't say anything which i find odd cuz now they offer it to everyone at least where im from but if not request an appointment with a geneticist they'll tell yu about all the terrifying possibilities they can test for