ASCP BOC EXAM Study Guide

ASCP BOC EXAM Study Guide 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) ...

ASCP BOC EXAM Study Guide 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 - ANS - 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 - ANS - 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 - ANS - 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 - ANS - c) sodium, potassium, chloride and total C02 A common cause of respiratory alkalosis is a) vomitting b) starvation c) asthma d) hyperventilation - ANS - 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) - ANS - 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 - ANS - 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 - ANS - 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 - ANS - c) sorbitol A patient with a B-cell deficiency will most likely exhibit: a) decreased phagocytosis b) increased bacterial infections c) decreased complement levels d) increased complement levels - ANS - b) increased bacterial infections Communication is enhanced by: a) a planned strategy that includes listening skills and ensuring an understanding with questions b) relying on e-mail, memos and voice mail to communicate new information c) formal, hierachical patterns instead of informal networking patterns d) assumptions if there are questions about the intent of the message - ANS - a) a planned strategy that includes listening skills and ensuring an understanding with questions IgM antibodies are frequently hemolytic because of: a)the dimeric structure b) the molecule's 5 antigen binding sites c) their sedimentation coefficient of 7-15 S d) their coefficient ability to fix complement - ANS - b) the molecule's 5 antigen binding sites A community hospital microbiology laboratory is processing significant numbers of stool cultures because of an outbreak of diarrhea following heavy rains and flooding in the county. A media that should be incorporated in the plating protocol is: a) colistin nalidixic acid for listeria b) MacConckey agar with sorbitol for Campylobacter c) mannitol salt agar for Enterococcus speices d) thiosulfate citrate bile salts sucrose for Vibrio species - ANS - d) thiosulfate citrate bile salts sucrose for Vibrio species 80 grams of NaOH (MW=40) are how many moles? a) 1 b) 2 c) 3 d) 4 - ANS - b) 2 An electrode has a silver/silver chloride anode and a platinum wire cathode. It is suspended in KCl solution and separated fro the blood to be analyzed by a selectively permeable membrane. Such an electrode is used to measure which of the following? a) pH b) PCO2 c) PO2 d) HCO2 - ANS - c) PO2 The organism most commonly associated with neonatal purulent mentingitis is: a) Neisseria meningitidis b) Streptococcus pneumoniae c) group B streptococci d) Haemophilus influenzae - ANS - c) group B streptococc