Collection of Blood and Non-Blood Specimens Practice Exam 2025 – The Complete Guide to Mastering Specimen Collection!

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How does a tourniquet affect venous pressure?

It decreases venous pressure, making veins flatter

It increases venous pressure, helping to fill veins with blood

When a tourniquet is applied, it temporarily restricts blood flow through the veins. This restriction leads to an accumulation of blood in the veins, which increases venous pressure. The increase in pressure causes the veins to become engorged and more prominent, making them easier to locate and puncture during venipuncture for blood collection.

This physiological response is important because it allows healthcare providers to efficiently select suitable veins for blood draws, thereby facilitating the collection of blood specimens. Proper application of a tourniquet is crucial to creating this effect without causing discomfort or harm to the patient.

Understanding how venous pressure changes with a tourniquet is an essential part of the blood collection process, ensuring that procedures are both effective and safe.

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It has no effect on venous pressure

It causes veins to constrict, making blood collection difficult

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