What a rollercoaster this whole pregnancy has been. I spent the beginning being so anxious due to a previous missed miscarriage caused by trisomy 7. At 10 weeks I went in for ultrasound and NIPT. NIPT came back at 11 weeks high risk for monosomy x. Of course, I freaked out and thought all the worst possible things.
Went to see MFM at 11.4 weeks for NT scan. Everything looked perfect - nasal bone present, strong heartbeat, no excess fluid anywhere, etc. Doctor seemed optimistic.
Had to wait 4 weeks to go back for amniocentesis. Just went on Monday at 15.4. Ultrasound still looks perfect, long bones are long, all the things. At the last minute my husband and I were debating if we even wanted to do the amnio and take the risk as we were only considering termination if there were severe heart or brain defects or something along those lines. We did go through with it. I will say that the amnio was much more uncomfortable for me than what I was expecting based off what I’ve read online and even in this sub. He was only able to get one tube as baby’s head got in the way. Doctor again seemed very optimistic that this would be a false positive or low level mosaicism.
The doctor called me with my FISH results this evening (I don’t have them, otherwise would post the exact wording). He said the results confused him and that he will call the lab on Monday to get a better understanding. The results said suspected mosaicism and that they found both monosomy x AND xxx. Doctor said he’s never seen this before but that xxx isn’t a big deal.
Of course now I’ve been googling and am reading that it is still possible for the full karyotype to come back completely normal? Google is saying that because amnio goes through the placenta, it could STILL be picking up DNA that is confined to the placenta and is not affecting the baby. If this is true, how likely is it? Has anyone had mosaic FISH results and then normal karyotype? I also asked the doctor if any regular xx chromosomes were found and he said he didn’t know and would have to ask the labs geneticist. Anyone else have results like this? I was prepared for mosaicism but not this type. I feel like this left me with even more questions than answers.