MLS Immunology Exam Study Guide | Questions with 100% Correct Answers | Verified | 23 Pages

A 19 year old girl came to her physician complaining of a sore throat and fatigue. Upon physical exam, lymphadenopathy was noted. Reactive lymphocytes were noted on the differential, but a rapid test for IM antibodies was negative. Liver enzymes were only slightly elevated. - EBV serological panel A 54 year old man was admitted to the hospital after having a seizure. Many laboratory tests were performed, including an RPR, but none of the results were positive. The physician suspects a case of late syphilis. Which test should be performed next? - Treponemal test such as MHA TP on serum A biological false positive reaction is least likely with which test for syphilis? - Fluorescent Treponema pallidum antibody absorption test A CA 125 was performed on a woman with ovarian cancer. After treatment, the levels fell significantly. An examination performed later revealed the recurrence of the tumor, but the CA 125 levels remained low. How can this finding be explained? - CA 125 may not be sensitive enough when used alone to monitor tumor development A child suspected of having an inherited humoral immunodeficiency disease is given diphtheria tetanus vaccine. Two weeks after the immunization, his level of antibody to the specific antigens is measured. Which result is expected for this patient if he or she indeed has a humoral deficiency? - No change in the level of specific antibody A dialysis patient is positive for both hepatitis B surface antigen and hepatitis B surface antibody. The physician suspects a laboratory error. Do you agree? - No, it is likely the patient has recently received a hepatitis B booster vaccination and could have these results A flow cytometry scattergram of a bone marrow sample shows a dense population of cells located in between normal lymphoid and normal myeloid cells. What is the most likely explanation? - An abnormal cell population is present A hospital employee received the final dose of the hepatitis B vaccine 3 weeks ago. She wants to donate blood. Which of the following results are expected from the hepatitis screen, and will she be allowed to donate blood? - HBsAg, negative; anti HBc, negative therefore she may donate