Clinical Biochemistry Sample Collection Process
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Questions and Answers

What is the nature of many tests in clinical biochemistry?

  • They involve analysis of hair samples and skin swabs
  • They are limited to venous blood and capillary blood
  • They include whole blood, serum, plasma, urine, feces, sweat, saliva, and body fluids (correct)
  • They focus solely on blood and urine specimens

    • What is the importance of the process of sample collection?

  • Use of advanced technology, quick processing time, and low cost
  • Multiple layers of sample collection, extensive documentation, and delayed delivery to the laboratory
  • Accurate request form, correct sample collection technique, correctly labeled specimens, and speedy delivery to the laboratory (correct)
  • Random selection of samples, no labeling required, and minimal documentation

    • Which specimen is usually the specimen of choice for blood analysis?

  • Arterial blood
  • Venous blood (correct)
  • Capillary blood
  • Sweat

    • How is plasma obtained?

    <p>By taking whole blood into an anticoagulant (D)</p> Signup and view all the answers

    What is the method for obtaining venous blood specimen for analysis?

    <p>Venipuncture (B)</p> Signup and view all the answers

    What represents the liquid part of the blood?

    <p>Plasma (A)</p> Signup and view all the answers

    What is the clear liquid that can be separated from clotted blood?

    <p>Serum (A)</p> Signup and view all the answers

    Which factor can affect the concentration of plasma protein and the substances bound to them?

    <p>Posture (B)</p> Signup and view all the answers

    What effect does maintaining occlusion with a tourniquet have during venipuncture?

    <p>Increases the rate of passage of proteins from the intravascular to extravascular compartment (D)</p> Signup and view all the answers

    Why should blood be taken from the opposite arm if the patient is receiving an intravenous infusion fluid?

    <p>To prevent interference with biochemical assays (B)</p> Signup and view all the answers

    Which type of anticoagulant should not be used for calcium estimation?

    <p>EDTA (C)</p> Signup and view all the answers

    What is defined as the disruption of the RBCs membrane and results in the release of hemoglobin?

    <p>Hemolysis (A)</p> Signup and view all the answers

    What may interfere with chemical reactions used in creatinine assays?

    <p>$K^+$-losing diuretics (D)</p> Signup and view all the answers

    What is usual to make it easier to enter the vein with the needle during venipuncture?

    <p>Applying a tourniquet (D)</p> Signup and view all the answers

    Where should laboratories accept blood for accurate testing?

    <p><em>Only the correct containers</em> (B)</p> Signup and view all the answers

    What does hemolysis result in?

    <p>Increased potassium estimation error (B)</p> Signup and view all the answers

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