AAB MT Exam Hem Lab Methods Questions And Answers Already Passed!!

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 The cyanmethemoglobin uses what law, in order to generate results? - Beer's law