In vitro diagnostic agents, namely, reagents and control solutions for analysis of biological samples, all for medical diagnostic purposes; reagents for medical diagnostic use; medical diagnostic assays and reagents for testing of biological samples; reagent kits consisting of enzymes, oligonucleotides, nucleic acids, natural and modified nucleotides, buffers, labels, and substrates for medical diagnostic purposes; medical diagnostic test kits comprising reagents for testing body fluids to determine fetal chromosomal abnormalities; chemical reagents, preparations and test kits for fetal nucleic acid analysis for medical use; diagnostic kits consisting primarily of reagents for nucleic acid detection and analysis for medical diagnostic purposes; reagents for medical diagnostic use and diagnostic kits comprised of medical diagnostic reagents and assays for use in connection with dna sequencing and genetic analysis