Circulating cell free DNA testing: are some test failures informative?
Among women with noninformative results attributable to low FF, trisomy 18 and/or triploidy risk are sufficiently high to warrant offering additional assessments (e.g. ultrasound). If the testing indication is ultrasound abnormality, amniocentesis and karyotype/microarray should be considered. © 2014 John Wiley&Sons, Ltd.
These observations suggest that NO is involved in cerebral oxygen vasoreactivity, particularly in severe hypoxia.