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?
- To prevent excessive bleeding after the procedure
- To numb the area before puncturing
- To increase blood flow to the site
- To make the veins more prominent (correct)
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?
- Record the blood volume obtained
- Wipe off the blood and change needles
- Apply excessive pressure to the puncture site
- Remove the tourniquet and quickly take out the needle (correct)
Which of the following materials is NOT required for capillary blood collection?
Which of the following materials is NOT required for capillary blood collection?
- Tourniquet (correct)
- Cotton
- Lancet
- Capillary tubes
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?
What is a key difference between arterial and venous blood samples?
What is a key difference between arterial and venous blood samples?
Flashcards
Capillary Blood Collection
Capillary Blood Collection
A technique for collecting a small sample of blood from a fingertip, heel, or earlobe using a small lancet. Capillary tubes are then used to collect the blood.
Venous Blood Collection (Venipuncture)
Venous Blood Collection (Venipuncture)
A technique for collecting a large volume of blood from a vein, typically in the arm, using a needle and syringe.
Arterial Blood Sample
Arterial Blood Sample
A type of blood sample that is taken from an artery. It is used to test for blood gases and pH.
Tourniquet
Tourniquet
Signup and view all the flashcards
Hemoconcentration
Hemoconcentration
Signup and view all the flashcards
Study Notes
Blood Collection Methods
-
Collecting blood samples is essential for disease prevention and treatment, but can be distressing for patients.
-
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.
-
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).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
