Q20.   An elderly patient who is being admitted for anemia o…

Q20.   An elderly patient who is being admitted for anemia of unknown cause has been on multiple medications at home for various ailments. In assessing the patient’s medication list, the nurse notes which medications that may alter hemostasis? (Select all that apply.)

Suppose you are performing an Ouchterlony double diffusion a…

Suppose you are performing an Ouchterlony double diffusion assay loading Ag1 and Ag3 in 2 wells close to the edge and Ab1 and Ab3 in the middle well. Suppose antigen 3 has an epitope in common with antigen 1. One of the antibodies reacts with the epitope common to both antigens. The other antibody reacts with a different epitope on antigen 1 (that is absent on antigen 3). Two precipitin lines form, with a spur pointing toward antigen 3. What does this result indicate?

A new assay is used to test 120 samples from patients with a…

A new assay is used to test 120 samples from patients with a clinically confirmed diagnosis of the relevant infection and 50 samples from healthy control subjects. The test results were positive for 90 of the infected patients and positive for 10 of the healthy controls. Calculate the positive predictive value of the assay.