My nurse midwife offered for us to see a genetic counselor as I am 37 and of advanced maternal age. My wife would like to do it and I am leaning more towards a no. Our compromise is to go to the appointment and talk to them and hopefully after that I will feel better one way or the other.
The test in question is the NIPT (Noninvasive Prenatal Testing). NIPT, which analyzes cell-free fetal DNA circulating in maternal blood, is a new option in the prenatal screening and testing paradigm for trisomy 21 and a few other fetal chromosomal aneuploidies.
BACKGROUND
DNA from the fetus circulates in maternal blood. Unlike intact fetal cells in maternal blood, which can persist for years after a pregnancy, circulating cell-free fetal DNA (ccffDNA) results from the breakdown of fetal cells (mostly placental) and clears from the maternal system within hours. Fetal DNA detected during a pregnancy, therefore, represents DNA from the current fetus. Although only about 10-15% of the cell-free DNA circulating in maternal blood is from the fetus, it can be detected and measured. Quantitative differences in chromosome fragments in maternal blood can be used to distinguish fetuses affected with trisomy 21, and a few other fetal aneuplodies, from those that are not affected.
Testing can be done any time after 10 weeks; typically it is done between 10-22 weeks. Results can take a week or more.
NIPT technologies have been validated in singleton pregnancies at high risk for trisomy 21 due to:
- advanced maternal age
- an abnormal serum screen
- personal or family history of aneuploidy
- abnormal ultrasound
At least one laboratory will accept samples that do not meet these high risk criteria. Additionally, at least one laboratory offers the test in twin pregnancies, and another for Turner syndrome (monosomy X) when the fetus presents with a cystic hygroma. Contact individual laboratories for additional information.
The testing is non-invasive, involving a maternal blood draw, so the pregnancy is not put at risk for miscarriage or other adverse outcomes associated with invasive testing procedures.
Re: Genetic Testing ... are you going to do it?
DD 12/20/99, DS 12/14/12, M/C 9/2014, M/C 1/2015
\ My husband and I talked about it quite a bit - and the only way we would consider not having the baby is if it had some genetic defect where it would live a horrible life in pain for a year or a few years and then have no chance of survival. Because we don't think that brining the baby into a terrible life of pain is necessarily the right thing to do either.
NEW PEANUT DUE 7.2017
NEW PEANUT DUE 7.2017
I 100% wanted to have the cell free DNA test done. I think arming yourself with information is crucial!