41. The FDA had already approved the fetal fibronectin immunoassay test for women who shown signs of premature delivery. 42. The new immunoassay system takes about a year _ between 220 and 400 days _ to produce results. 43. It was determined that this preparation behaved anomalously in certain immunoassays and was not suitable as an IS. 44. Some immunoassays can be carried out simply by mixing the reagents and sample and making a physical measurement. 45. In other words, in some immunoassays , the analyte may be an antibody rather than an antigen. 46. A large number of labels exist in modern immunoassays , and they allow for detection through different means. 47. Rosalyn Sussman Yalow and Solomon Berson are credited with the development of the first immunoassays in the 1950s. 48. Another demonstrated labeless immunoassay involves measuring the change in resistance on an electrode as antigen binds to it. 49. Cortisol immunoassays on the other hand have been shown to be prone to both over-and underestimation. 50. One reason for this is that a large amount of serum TK1 identified by immunoassay is not enzymatically active.
