Question 76
Prozone effect (due to antibody excess) will result in an initial false negative in spite of the large amount of antibody in the serum, followed by a positive result as the specimen is diluted.
The prozone effect ( when performing a screening titer) is most likely to result in:
Question 77
The DAT is most likely to be negative in ABO HDFN. It's possible that the washing done as part of the DAT may break the bonds between anti-A (or anti-B) and the newborn's poorly developed A (or B) antigens.
For which of the following antibodies is the DAT most likely to be negative when testing a newborn for possible HDFN?
Question 78
The parents will each give one of their ABO genes, so the possibilities are as follows:
AB, AO, AB, AO = 50% chance of A blood type, 50% chance of AB blood type Blood Bank If parents have the blood group genotypes AA and BO, what is the possibility of having a child with a blood type of A?
Question 79
Laboratories performing which of the following types of tests need to be enrolled in a CLIA-approved proficiency testing program?
Question 80
Clostridium difficile is a gram-positive, anaerobic, spore-forming bacillus that produces a strong toxin. C difficile is a common cause of antibiotic-associated diarrhea and pseudomembranous colitis.
Microbiology
A recto-sigmoidoscopy revealed pseudomembranes in a patient with severe diarrhea following prolonged treatment with ampicillin. Which of the following organisms is MOST likely to be isolated?