New Quiz 26 Jan Welcome to your MLT- Professional Name: Email: Phone Number: [John comes in to donate a unit of whole blood at the collection center of the community blood supplier. The EIA screen is reactive for anti-HIV-1/2. The test is repeated in duplicate and is nonreactive. John is:] Cleared for donation Deferred for 6 months Status is dependent on confirmatory test Deferred for 12 months None . [Select the chemical that is used in most HPLC procedures to decrease solvent polarity.] Hexane Nonane Chloroform Acetonitrile None . [The concentration of this substance is higher in capillary blood than in venous blood:] Blood urea nitrogen Carotene Glucose Total protein None . [A non–spore-forming, slender gram-positive rod forming palisades and chains was recovered from a vaginal culture and grew well on tomato juice agar. The most likely identification is:] Lactobacillus spp. Bacillus spp. Neisseria spp. Streptococcus spp. None . [The WHO classification requires what percentage for the blast count in the blood or bone marrow for the diagnosis of AML?] At least 30% At least 20% At least 10% Any percentage None . [What is the youngest age a person can make an allogeneic whole-blood donation?] 14 15 16 17 None . [Which of the following statistical tests is used to compare the means of two methods?] Student’s t test F distribution Correlation coefficient (r) Linear regression analysis None . [Which of the following conditions is associated with the greatest proteinuria?] Acute glomerulonephritis Chronic glomerulonephritis Nephrotic syndrome Acute pyelonephritis None . [All of the following genera are anaerobic cocci that stain gram positive except:] Peptococcus spp. Peptostreptococcus spp. Streptococcus spp. Veillonella spp. None . [Bernard–Soulier syndrome is associated with:] Decreased bleeding time Decreased factor VIII assay Thrombocytopenia and giant platelets Abnormal platelet aggregation to ADP None . [A pure culture of β-hemolytic streptococci recovered from a leg wound ulcer gave the following reactions: CAMP test = Neg Hippurate hydrolysis = Neg Bile esculin = Neg 6.5% salt = Neg PYR = Neg Bacitracin = Resistant Optochin = Resistant SXT = Sensitive The most likely identification is:] Group A streptococci Group B streptococci Enterococcus faecalis Nongroup A, nongroup B, nongroup D streptococci None . [An immunosuppressed man has several episodes of pneumonia, intestinal pain, sepsis with gram-negative rods, and a history of military service in Southeast Asia 20 years earlier. The most likely cause is infection with:] Trypanosoma cruzi Strongyloides stercoralis Naegleria fowleri Paragonimus westermani None . [The transverse plane divides the body:] diagonally into upper and lower portions. horizontally into upper and lower portions. vertically into front and back portions. vertically into right and left portions. None . [Which statement accurately describes serum transaminase levels in AMI?] ALT is increased 5- to 10-fold after an AMI AST peaks 24–48 hours after an AMI and returns to normal within 4–6 days AST levels are usually 20–50 times the upper limit of normal after an AMI Isoenzymes of AST are of greater diagnostic utility than the total enzyme level None . [SITUATION: A urine sample is received in the laboratory with the appropriate custody control form, and a request for drug of abuse screening. Which test result would be cause for rejecting the sample?] Temperature after collection 95°F pH 5.0 Specific gravity 1.005 Creatinine 5 mg/dL None . [What reagent is most commonly used to stain DNA separated by electrophoresis?] Silver nitrate Nicotinamide adenine dinucleotide Cationic dye Ethidium bromide None . [In situ hybridization (ISH) tests for human papilloma virus (HPV) using cervical smears differ from immunochemical staining of tissue in which regard?] ISH has lower analytical sensitivity ISH has lower analytical specificity ISH differentiates subtypes more easily ISH differentiates cervical neoplasia from genital warts None . [How long should Mycobacterium tuberculosis–positive cultures be kept by the laboratory after identification and antibiotic susceptibility testing have been performed?] 1–2 months 2–4 months 5–6 months 6–12 months None . [What is one possible genotype for a patient who develops anti-C antibody?] R1r R1R1 r´r rr None . [In which of the following conditions does LAP show the least activity?] Leukemoid reactions Idiopathic myelofibrosis PV CML None . [An individual’s blood type (A, B, AB, or O) is determined by the presence or absence of which of the following on the red blood cells? ] Antigens Antibodies Chemicals Hormones None . [Which of the following clotting factors plays a role in clot formation in vitro, but not in vivo? in vitro clot formation and not in vivo coagulation?] VIIa IIa XIIa Xa None . [A 6-month-old male infant was hospitalized with a respiratory infection. He was diagnosed with apnea and bronchiolitis. Further testing revealed congenital heart disease. Bacterial cultures were negative for Streptococcus pneumoniae and Haemophilus influenzae. What further testing should be done?] Respiratory syncytial virus (RSV) Rotavirus Norwalk virus HIV None . [A 92-year-old male diagnosed with anemia and episodes of frequent falling was typed as B negative and transfused 1 unit of packed red blood cells, also B negative. He was not recently transfused, and the antibody screen was negative. During the transfusion, his temperature rose from 36.2°C to 36.4°C, his pulse rose from 96 to 124, respirations from 18 to 20, and BP from 127/81 to 174/83. He was transfused with 205 mL before a reaction was called by the transfusionist. The postspecimen DAT was negative and clerical check acceptable. Urinalysis yielded 1+ blood with 5 RBCs microscopically. Other symptoms included tachycardia and flushing. What reaction had most likely taken place?] Febrile nonhemolytic Acute hemolytic Anaphylactic Volume overload None . [Which virus is associated with venereal and respiratory tract warts and produces lesions of skin and mucous membranes?] Polyomavirus Poxvirus Adenovirus Papillomavirus None . [Which statement regarding bilirubin metabolism is true?] Bilirubin undergoes rapid photo-oxidation when exposed to daylight Bilirubin excretion is inhibited by barbiturates Bilirubin excretion is increased by chlorpromazine Bilirubin is excreted only as the diglucuronide None . [In real-time PCR analysis, the absolute concentration of PCR product is determined by plotting which two values?] Fluorescent intensity versus melting temperature The threshold cycle versus concentration The well factor versus threshold cycle The melting temperature versus concentration None . [Which test typically requires a refrigerated stool specimen?] Fecal fat Guaiac Occult blood Ova and parasites None . [What is the most likely cause when a Western blot or ELISA is positive for all controls and samples?] Improper pipetting Improper washing Improper addition of sample Improper reading None . [Which of the following sample collection and processing conditions will lead to inaccurate seminal fluid analysis results?] Sample stored at room temperature for 1 hour before testing Sample collected following coitus Sample collected without an anticoagulant Sample collected without use of a condom None . Time's up
