U.S. vs blood test: The 2nd trimester ultrasound can pick up anatomical abnormalities, look for placement of the placenta, help date the baby, and confirm the number of babies in the uterus. The "quad screen" which is a blood test of the mother, can pick up common genetic abnormalities. Talk to your ob, midwife for more details.
Answered 1/1/2017
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Poor sensitivity: A high resolution ultrasound can often yield evidence of structural changes that occur more often in some chromosomal disorders.It is not specific.Many genetic metabolic disorders are only picked up after birth when byproducts of metabolism build up in babies blood.Some metabolic disorders can be confirmed by fibroblast culture on material from an amniocentesis when family hx is suggestive.
Answered 3/14/2013
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