Authors of a research letter in this week's issue of THE LANCET highlight how screening for Down's syndrome based on maternal age and four markers in maternal blood should be used worldwide-the ...
March 6, 2003 — A quadruple testing strategy described in the March 8 issue of The Lancet was the best for determining who should be invasively screened for Down's syndrome. Both the investigators and ...
The quadruple or combined test is a screening test based on the analysis of several markers or chemicals in the mother’s blood. It is performed in the second trimester of pregnancy, between the 15th ...
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