AAB MT Exam 2023 with 100% correct answers

What type of specimen is used for hematology testing? EDTA What type of specimen is used for coagulation testing? 3.2% citrated plasma When should a 3.2% citrated plasma be rejected? If the specimen is clotted, hemolyzed or QNS. How is platelet poor plasma obtained from a 3.2 citrated plasma specimen? By centrifuging the specimen. In a coagulation specimen, what is the ratio between anticoagulant and whole blood? 1:9 ratio In a coagulation specimen, what is the ratio between whole blood and anticoagulant? 9:1 ratio What is the formula for the Red Blood Cell (RBC) Count? (Cells counted X Dilution X 10) / Number of square millimeters counted What is a common source of errors for the RBC Count? Cold agglutinins (due to cold antibodies present). Why is platelet poor plasma essential for coagulation testing? Platelets initiates the coagulation cascade (results in shorten result times). Cold auto-antibodies cases what errors in the CBC test? A falsely decreased HCT and RBC, plus a falsely elevated MCV and MCHC (greater than 37). If a patient has a cold auto-antibody, what can be done to obtain a correct CBC? Incubate specimen at 37 C, reanalyze specimen immediately after incubation, and immediately make the peripheral smear. What is the method for performing a hemoglobin concentration? Cyanmethemoglobin method What is the principle behind the cyanmethemoglobin method? That hemoglobin + ferricyanide yields cyanmethemoglobin