Difficulty: Medium

Average Score: 66%

When should a phlebotomist remove the tourniquet when using the syringe method for venipuncture

Rationale

After 30 seconds of blood flow into the syringe.

The tourniquet should be removed after approximately 30 seconds of blood flow into the syringe to prevent hemoconcentration and ensure accurate test results. Prolonged use of a tourniquet can lead to changes in blood composition, affecting the samples collected.

A (As soon as blood starts flowing into the syringe) YOUR ANSWER

Removing the tourniquet immediately as blood begins to flow can lead to inadequate specimen collection, as the phlebotomist may not have enough time to collect a sufficient volume of blood for testing. This method does not allow for optimal sample quality.

B (After 2 min of blood flow into the syringe) YOUR ANSWER

Waiting for 2 minutes after blood flow is excessive and could result in hemoconcentration, where cellular components become disproportionately concentrated in the blood sample due to prolonged tourniquet application. This can compromise the integrity of the test results.

C (After the last sample is collected) YOUR ANSWER

This option is incorrect because maintaining the tourniquet until all samples are collected can lead to altered blood chemistry. It is crucial to remove the tourniquet after a short duration of blood flow to ensure accurate and reliable test results.

D (After 30 seconds of blood flow into the syringe) CORRECT

This is the ideal time to remove the tourniquet as it balances the need for adequate blood collection while minimizing the risk of hemoconcentration. Following this guideline helps maintain the integrity of the blood sample for accurate testing.

Conclusion

In venipuncture using the syringe method, the tourniquet should be removed after approximately 30 seconds of blood flow to optimize sample quality and prevent hemoconcentration. This timing ensures that the blood collected reflects the true physiological state, leading to more accurate laboratory results. Other options either compromise sample quality or do not allow for sufficient blood collection, highlighting the importance of adhering to this guideline.

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