Podcast
Questions and Answers
What is the first step in the procedure for collecting capillary blood samples?
What is the first step in the procedure for collecting capillary blood samples?
- Apply slight pressure over the area
- Wipe off the first drop of blood
- Disinfect the area with 70% alcohol (correct)
- Deep quick stab with a disposable blood lancet
Which site is NOT suitable for capillary puncture?
Which site is NOT suitable for capillary puncture?
- Neck (correct)
- Heel pulp
- Finger pulp
- Great toe
What material is used for obtaining capillary blood samples?
What material is used for obtaining capillary blood samples?
- Vacutainer tubes
- Luer-lock syringes
- Capillary tubes (correct)
- Ethanol
How deep should the puncture be when using a lancet for capillary blood collection?
How deep should the puncture be when using a lancet for capillary blood collection?
What happens if the tourniquet is left on for more than 2 minutes?
What happens if the tourniquet is left on for more than 2 minutes?
What color is arterial blood, and why?
What color is arterial blood, and why?
During venipuncture, at what angle should the needle be inserted?
During venipuncture, at what angle should the needle be inserted?
Which of the following is NOT part of the preparation for blood collection?
Which of the following is NOT part of the preparation for blood collection?
What should be done after blood collection using a venipuncture?
What should be done after blood collection using a venipuncture?
Which of the following materials is NOT used in capillary blood sampling?
Which of the following materials is NOT used in capillary blood sampling?
Flashcards
Capillary Tube
Capillary Tube
A thin, rigid tube used to collect small blood samples by capillary action. The blood travels up the tube against gravity.
Venipuncture
Venipuncture
Collecting blood from a vein using a syringe and needle.
Lancet
Lancet
A tool used to draw blood by making a small cut in the skin, usually on a finger or heel.
Capillary Blood
Capillary Blood
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Venous Blood
Venous Blood
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First Drop of Blood
First Drop of Blood
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Tourniquet
Tourniquet
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Pressure Application
Pressure Application
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Vial/Tube
Vial/Tube
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Excessive Pressure
Excessive Pressure
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Study Notes
Blood Collection Methods
- Collecting blood samples is important for disease prevention and treatment, but can be a distressing experience for patients.
- Capillary blood collection uses thin tubes (capillary tubes) where blood flows against gravity into the tubes. This method is used for small blood volumes.
- Peripheral blood collection uses capillary tubes and involves pricking the finger, heel, or earlobe (in infants).
- Venous blood collection is used for larger blood volumes; a vein is punctured to collect blood.
Capillary Blood Collection Procedure
- Disinfect the area with 70% alcohol, allow to dry.
- Use a lancet to make a puncture about 3mm deep.
- Wipe away the first drop of blood.
- Apply gentle pressure to prevent excessive pressure and tissue fluid dilution.
- Collect the blood into a capillary tube.
Venous Blood Collection Procedure
- Identify the patient and prepare the equipment (tourniquet, alcohol, cotton, adhesive strip, sterile syringes, suitable tubes).
- Place a tourniquet above the puncture site.
- Insert a needle at a 30-degree angle into a vein.
- Collect the blood into a syringe or evacuated tube.
- Remove the tourniquet and needle quickly, applying pressure to the puncture site.
- Transfer blood to the appropriate collection vials.
Blood Collection Considerations
- Avoid placing a tourniquet on a patient for more than 2 minutes.
- The tourniquet should not be placed too tightly.
Blood Type Differences
- Arterial blood is bright red due to high oxygen levels.
- Venous blood is dark red or blackish due to lower oxygen levels.
Vacuum Tubes
- Different colored vacuum tubes contain varying anticoagulants.
- Different anticoagulants are used depending on the requirements of the blood tests to be performed.
- Common color codes include:
- Purple: EDTA for complete blood counts
- Red: No anticoagulant for serological tests
- Blue: Sodium citrate for coagulation tests
- Gray: Fluoride for blood sugar tests
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