Clinical Laboratory Collections Procedure
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Questions and Answers

What is the initial step in the laboratory testing process according to the text?

  • Sample drawn (correct)
  • Sample processed
  • Sample analyzed
  • Transport sample delivered

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

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

What method is mainly used for blood gas analyses?

  • Vein puncture
  • Venipuncture
  • Arterial puncture (correct)
  • Capillary puncture

In what phase can laboratory practice be traditionally divided into?

<p>Pre-analytical, Analytical, Phlebotomy (D)</p> Signup and view all the answers

What role does phlebotomy play in patient care according to the text?

<p>It aids in disease diagnosis, monitoring, and treatment. (C)</p> Signup and view all the answers

Where should the phlebotomist wear personal protective equipment (PPE) according to the text?

<p>Before specimen collection (C)</p> Signup and view all the answers

Why should the tourniquet be released once blood flow is established during venipuncture?

<p>To prevent hemoconcentration (B)</p> Signup and view all the answers

What is the purpose of clenching the fist before venipuncture, according to the text?

<p>Increase lactate, phosphate, and potassium levels in the blood (D)</p> Signup and view all the answers

How can dehydration contribute to hemoconcentration?

<p>By increasing the concentration of larger molecules in the blood (B)</p> Signup and view all the answers

What is a common reason for sample rejection in laboratories, as mentioned in the text?

<p>Use of unsuitable collection tubes (B)</p> Signup and view all the answers

Why should clenching the fist be avoided before collecting specimens for clinical laboratory analysis?

<p>It can alter blood composition and affect test results (A)</p> Signup and view all the answers

What happens if a tourniquet is maintained for longer than 1 minute during venipuncture?

<p>Relative hemoconcentration occurs (C)</p> Signup and view all the answers

Where should a tourniquet be applied before venipuncture?

<p>4-5 finger widths above the venipuncture site (C)</p> Signup and view all the answers

What is the correct angle to enter the vein during venipuncture?

<p>30-degree angle (D)</p> Signup and view all the answers

When should the tourniquet be released during blood collection?

<p>After blood is collected (C)</p> Signup and view all the answers

How should sharps and broken glass be disposed of after blood collection?

<p>In a sharps container (B)</p> Signup and view all the answers

What should be done after withdrawing the needle during blood collection?

<p>Apply pressure with a cotton ball and discard the needle (D)</p> Signup and view all the answers

What is the appropriate duration for disinfecting the venipuncture site with 70% isopropyl alcohol?

<p>30 seconds (A)</p> Signup and view all the answers

What is the recommended method to prevent clot formation in blood specimens?

<p>Mix tubes containing anticoagulants immediately after collection (D)</p> Signup and view all the answers

Which potential pre-analytical error is addressed by ensuring proper blood-to-additive ratios?

<p>Insufficient filling of tubes (A)</p> Signup and view all the answers

What can happen if blood samples are not processed within 2 hours?

<p>Potential for time-related variations in analyte concentrations (A)</p> Signup and view all the answers

How can slow blood flow during collection be addressed to prevent pre-analytical errors?

<p>Ensure adequate blood volume (A)</p> Signup and view all the answers

What is the potential consequence of not following recommended processing times for blood samples?

<p>Time-related variations in analyte concentrations (D)</p> Signup and view all the answers

What role does proper patient instruction play in preventing pre-analytical errors?

<p>Prevents inaccurate results due to lack of specific preparations (B)</p> Signup and view all the answers

What is the major impact of an increased anticoagulant-to-specimen ratio on a specimen?

<p>Dilution of the specimen (D)</p> Signup and view all the answers

In the recommended order of draw for plastic vacuum tubes, which tube is used for preserving viability of microorganisms for microbiology testing?

<p>Blood culture bottle (yellow-black striped tubes) (B)</p> Signup and view all the answers

Which tube forms calcium salts to remove calcium in the process of blood collection?

<p>Coagulation tube (light blue top) (B)</p> Signup and view all the answers

What is the purpose of a serum separator tube (red-grey tiger top or gold) in blood collection?

<p>Separate blood from serum on centrifugation (B)</p> Signup and view all the answers

Which anticoagulant is present in a PST tube (light green top) and separates plasma with a gel at the bottom of the tube?

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

Which tube contains sodium fluoride and potassium oxalate, serving as an antiglycolytic agent to preserve glucose for up to five days?

<p>Light grey top tube (Oxalate/fluoride) (B)</p> Signup and view all the answers

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