Intermediate Risk For Down Syndrome. The high degree of variability of the phenotype is the hallmark of ds clinical picture, not every patient. This means that for every 1,000 pregnant women, one will have a baby born with down's syndrome and 999 will.
Intermediate risk of down syndrome 1:436. The high degree of variability of the phenotype is the hallmark of ds clinical picture, not every patient. The most efficient screening for down syndrome is achieved when both first trimester and second trimester markers are combined.