Podcast
Questions and Answers
What is the main purpose of using a tourniquet during venous blood collection?
What is the main purpose of using a tourniquet during venous blood collection?
What should be done immediately after obtaining a blood sample using a venipuncture?
What should be done immediately after obtaining a blood sample using a venipuncture?
Which of the following materials is NOT required for capillary blood collection?
Which of the following materials is NOT required for capillary blood collection?
What could be a consequence of leaving a tourniquet on for more than 2 minutes?
What could be a consequence of leaving a tourniquet on for more than 2 minutes?
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What is a key difference between arterial and venous blood samples?
What is a key difference between arterial and venous blood samples?
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Study Notes
Blood Collection Methods
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Collecting blood samples is essential for disease prevention and treatment, but can be distressing for patients.
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Capillary/Peripheral Blood: Thin tubes (capillary tubes) allow blood to rise against gravity. A small amount of blood is obtained by pricking the finger, heel, or earlobe.
- Materials needed include lancets, capillary tubes, alcohol, and cotton.
- Procedure: Disinfect the area, stab with the lancet (about 3mm deep), wipe off the first drop, gently apply pressure to avoid excessive pressure and diluted blood; collect blood.
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Venous Blood Venipuncture: Used for large blood volumes.
- Procedure: Have the patient sit down, locate the vein, apply a tourniquet, insert a needle, collect blood, remove the needle, apply pressure, and transfer collected blood to the appropriate vial.
- Materials needed include tourniquet, alcohol, cotton, adhesive strips, sterile disposable syringes, and suitable tubes for testing.
Blood Collection Considerations
- Tourniquet: Should not be too tight, avoid leaving it on for longer than two minutes. Prolonged tourniquet use can dilute blood samples.
- Arterial vs. Venous Blood: Arterial blood is bright red due to plenty of oxygen. Venous blood is dark red/blackish, low in oxygen.
- Tube Types: Vacuum tubes with various colored caps contain different anticoagulants (substances that prevent blood from clotting) used for different tests (e.g., EDTA for complete blood counts, sodium citrate for coagulation tests, fluoride for blood sugar tests).
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Description
Test your knowledge on various blood collection methods, including capillary and venous techniques. This quiz covers the procedures, materials needed, and important steps to ensure safe and effective blood sampling for disease prevention and treatment.
