ASCP hematology Laboratory Testing VERIFIED SOLUTIONS

ASCP hematology Laboratory Testing VERIFIED SOLUTIONS Which of the following is the formula to calculate an absolute cell count? A. Number of cells counted/total count B. Total count/number of cells counted C. 10X total count D. % of cells counted x total count - ANSWER D. % of cells counted x total count A 40-year old man had an erythrocyte count of 2.5 X10(6)/uL, hematocrit of 22% and a reticulocyte count of 2.0%. what is the patient's absolute reticulocyte count? A. 5.0 x 10(3)/uL (5.0 x 10(9)/L) B. 50.0 x 10(3)/uL (50.0 x 10(9)/L) C. 500 x 10(3)/uL (500 x 10(9)/L) D. 5000 x 10(3)/uL (5000 x 10(9)/L) - ANSWER B. 50.0 x 10(3)/uL (50.0 x 10(9)/L) The mean value of a reticulocyte count on specimens of cord blood from helathy, fullterm newborns is approximetely: A. 0.5% B 2.0% C. 5.0% D. 8.0% - ANSWER C. 5.0% Newborns have elevated retic counts A patient has a high cold agglutinin titer. Automated hematology analyzer results reveal an elevated MCV, MCH and MCHC as well as a decreased RBC. Individual erythrocytes appear normal on a stained smear but agglutinates are noted. The appropriate course of action would be to: A. Perform the RBC, Hgb, and Hct determinations using manual methods. B. perform the RBC determination by a manual method; us the automated results for the Hgb and Hct C. Repeat the determinations using a microsample of diluted blood D. Repeat the determinations using a prewarmed microsample of diluted blood - ANSWER D. Repeat the determinations using a prewarmed microsample of diluted blood Supravital staining is important for reticulocytes sice the cells must be living in order to stain the: A. Remaining RNA in the cell B. Iron before it precipitates C. Cell membrane before it dries out D. Denatured hemoglobin in the cell - ANSWER A. Remaining RNA in the cell. Using supravital stain, residual ribosomal RNA is precipitated within the reticulocytes Which of the following is used for staining reticulocytes? A. Giemsa stain B. Wright stain C. New Methylene blue D. Prussian Blue - ANSWER C. New Methylene blue Which of the following values is calculated form the red blood cell indices in an automated hematology analyzer? A. Red blood cell count (RBC) B. Hematocrit C. Mean corpuscular volume (MCV) D. Red cell distribution width (RDW) - ANSWER B. Hematocrit. The calculated RBC parameters include the hematocrit, derived from the MCV and RBC, MCH (mean corpuscular hemoglobin) which is calculated from the hemoglobin concentration and the RBC and the MCHC, which is determined form the hemoglobin value and the hematocrit A hematology analyzer counts red blood cells by which method? A. Impedence B. Chromogenic C. Photometric D. Turbidimetric - ANSWER A. Impedence The RDW is elevated on a CBC report. The smear would show: A. Hypochromia B. Anisocytosis C. Poikilocytosis D. Macrocytosis - ANSWER B. Anisocytosis. The RDW is a quantitative estimate of erythrocyte anisocytosis An oncology patient has the following results: DAY 1 DAY2 WBC-8.0 2.0 RBC-3.5 3.45 Hgb-10.0 9.9 Hct-29.8% 29.5 plt-180 150 The most probable explanation is: A. chemotherapy B. cold antibody C. clotted specimen D. inadequate mixing - ANSWER A. chemotherapy. A leukocyte count and differential on a 40 year old caucasian man revealed: WBC: 5.4x10(3) Segs: 20% Lymphs: 58% Monos: 20% Eosinophils: 2% This data represents: A. Absolute lymphocytosis B. Relative neutrophilia C. Absolute neutropenia D. Leukopenia - ANSWER C. Absolute neutropenia A leukocyte count and differential on a 40 year old caucasian man revealed: WBC: 5.4x10(3) Segs: 20% Lymphs: 58