ASCP BOC EXAM Study Guide 2022 135 Questions with 100% Correct Answers

When using an electronic cell counter, which of the following results can occur in the presence of a cold agglutination? a) increased MCV and decreased RBC b) increased MCV and normal RBC c) decreased MCV and increased MCHC d) decreased MCV and RBC Correct Answer: a) increased MCV and decreased RBC Cerebrospinal fluid for glucose assay should be: a) refrigerated b) analyzed immediately c) heated to 56 degree C d) stored at room temp after centrifugation Correct Answer: b) analyzed immediately The major crossmatch will detect: a) group A patient mistyped as group O b) unexpected red cell antibody in the donor unit c) Rh-neg donor unit mislabeled as Rh-Pos d) recipient antibody directly against antigens on the donor red cells Correct Answer: d) recipient antibody directly against antigens on the donor red cells The anion gap is useful for quality control of laboratory reselts for a) amino acids and proteins b) blood gas anaylses c) sodium, potassium, chloride and total C02 d) calcium, phosphorus and magnesium Correct Answer: c) sodium, potassium, chloride and total C02 A common cause of respiratory alkalosis is a) vomitting b) starvation c) asthma d) hyperventilation Correct Answer: d) hyperventilation Blood is diluted 1:200, and a platelet count is performed. 180 platelets were counted in the center square millimeter on one side of the hemacytometer and 186 on the other side/ The total platelet count is: a) 146 x 10³/μL (146 x 10⁹/L) b)183 x 10³/μL (183 x 10⁹/L) c)366 x 10³/μL (3666 x 10⁹/L) d)732 x 10³/μL (732 x 10⁹/L) Correct Answer: c)366 x 10³/μL (3666 x 10⁹/L) When staining acid-fast bacilli with Truant auramine-rhodamine stain, potassium permanganate is used a a) decolorizing agent b) quenching agent c) mordant d) dye Correct Answer: b) quenching agent A first morning sputum is received for culture of acid-fast bacilli. It is digested and concentrated by the N-acetyl-L-cysteine alkali method. Two Sabouraud dextrose slants are incubated in the dark at 35ºC with 5%-10% CO2. The smear reveal acid-fast bacilli, but the slants show no growth after 8 weeks. The explanation is: a) improper media used b) incorrect concentration procedure used c) improper specimen submitted d) exposure to CO2 prevents growth Correct Answer: a) improper media used MacConkey media for screening suspected cases of hemorrhagic E. coli O157:H7 must contain: a) indole b) citrate c) sorbitol d) lactose Correct Answer: c) sorbitol