As a matter of fact, these test tubes are characterized by such features ... such as the blood collection solutions and the serum separators, guarantee a perfect functioning.

Figure 1: Protein antigens from different infectious disease agents are covalently coupled to uniquely color-coded microspheres in separate tubes ... from the test serum sample.

Second-trimester screening of a pregnant woman's serum for markers of such congenital abnormalities as fetal trisomy 21 (Down syndrome) and neural tube defects has become an important part of ...