#1
Which of the following veins is commonly used for venipuncture in adults?
Cephalic vein
ExplanationThe cephalic vein is commonly used for venipuncture in adults due to its accessibility and visibility.
#2
What is the purpose of using a tourniquet during blood collection?
To make the veins more visible and palpable
ExplanationA tourniquet is used to constrict blood flow, making veins more visible and palpable for easier venipuncture.
#3
What is the purpose of gently inverting blood collection tubes after filling them?
To mix the blood with the anticoagulant or additive
ExplanationGently inverting filled blood collection tubes ensures proper mixing of blood with anticoagulants or additives, maintaining sample integrity.
#4
Which of the following is NOT a step in the process of blood collection using the evacuated tube method?
Applying the tourniquet after inserting the needle
ExplanationApplying the tourniquet after needle insertion is not a step in the blood collection process using the evacuated tube method.
#5
Which of the following is a potential cause of hemolysis during blood collection?
Collecting the sample too quickly
ExplanationHemolysis can occur if blood samples are collected too quickly, causing red blood cells to rupture and release hemoglobin into the plasma.
#6
What is the correct procedure if a patient is on anticoagulant therapy and requires a blood draw?
Consult the patient's healthcare provider for specific instructions
ExplanationPatients on anticoagulant therapy may require specific instructions, and consulting their healthcare provider ensures safe and appropriate blood collection.
#7
Which antiseptic is commonly used for cleaning the puncture site before blood collection?
Alcohol
ExplanationAlcohol is commonly used as an antiseptic to clean the puncture site and minimize the risk of infection during blood collection.
#8
What is the correct order of draw when using evacuated tube systems for blood collection?
Coagulation tubes, serum tubes, blood culture tubes, additive tubes
ExplanationThe correct order of draw helps prevent cross-contamination and includes coagulation tubes, serum tubes, blood culture tubes, and additive tubes.
#9
What is the recommended angle of needle insertion for venipuncture?
45 degrees
ExplanationA 45-degree angle of needle insertion is recommended for venipuncture to optimize successful blood collection.
#10
Which of the following additives is commonly found in lavender-top tubes?
EDTA
ExplanationLavender-top tubes typically contain the anticoagulant EDTA, which prevents blood clotting and allows for accurate testing of various blood parameters.
#11
Which of the following veins is preferred for venipuncture in infants?
Brachial vein
ExplanationThe brachial vein is preferred for venipuncture in infants due to its accessibility and reduced risk of complications.
#12
Which of the following veins is commonly used for venipuncture in emergency situations?
Femoral vein
ExplanationIn emergency situations, the femoral vein may be used for venipuncture due to its accessibility and rapid access.
#13
Which of the following is a potential complication of improper venipuncture technique?
Hematoma
ExplanationImproper venipuncture technique can lead to the formation of a hematoma, a localized collection of blood outside the blood vessels.
#14
What should be done if a patient faints during or after blood collection?
Remove the tourniquet and needle immediately
ExplanationIn the event of a patient fainting, prompt removal of the tourniquet and needle is essential to ensure patient safety.
#15
What is the primary purpose of a butterfly needle in blood collection?
To collect blood from small veins
ExplanationA butterfly needle is designed for collecting blood from small veins, providing a less invasive option for certain patients.
#16
Which of the following is an appropriate action if a patient complains of pain during venipuncture?
Withdraw the needle slightly
ExplanationIf a patient experiences pain during venipuncture, withdrawing the needle slightly can help alleviate discomfort.
#17
What is the purpose of applying pressure to the puncture site after blood collection?
To stop bleeding
ExplanationApplying pressure to the puncture site after blood collection helps stop bleeding and promotes clot formation.
#18
Which of the following factors can affect the accuracy of blood test results?
All of the above
ExplanationVarious factors, including patient factors, specimen collection, and handling, can collectively affect the accuracy of blood test results.