The anticoagulant present in a light-blue stopper tube is:

• A.Ethylenediaminetetraacetic acid (EDTA)
• B.sodium citrate
• C.potassium oxalate
• D.heparin

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Hemoglobin F has a high affinity for oxygen. When Hb F is elevated, cells containing Hb S are more oxygenated and do not sickle as readily as they would if Hb F were not present or present in small quantities.
Which hemoglobin, when elevated, acts as a protection against sickling in patients with HbS?

• A.Hemoglobin F
• B.Hemoglobin A2
• C.Hemoglobin G
• D.Hemoglobin C

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Which of the following is a selective media recommended for the isolation of Clostridium difficile?

• A.Kanamycin Vancomycin laked blood (LKV) agar
• B.Cefoxitin-cycloserine-fructose agar (CCFA)
• C.Thiosulphate citrate bile salts sucrose (TCBS) agar.
• D.Buffered-charcoal yeast extract(BCYE) agar

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What has happened in a titer, if tubes #5-7 show a stronger reaction than tubes #1-4?

• A.prozone reaction
• B.equivalence reaction technical error
• C.postzone reaction
• D.poor technique

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The most common specimen analyzed in the hematology section is:

• A.plasma.
• B.whole blood.
• C.serum.
• D.urine.

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