CAT Exam Practice Test Related

Review CAT Exam Practice Test related questions and content

When should the nurse conduct an Allen's test?

  • A. When obtaining pulmonary artery pressures
  • B. To assess for the presence of a deep vein thrombus in the leg
  • C. Just before arterial blood gases are drawn peripherally
  • D. Prior to attempting a cardiac output calculation
Correct Answer: C

Rationale: The correct time to conduct an Allen's test is just before arterial blood gases are drawn peripherally. This test is performed to assess the adequacy of collateral circulation in the hand before obtaining arterial blood gases. Choice A is incorrect because an Allen's test is not specifically done when obtaining pulmonary artery pressures. Choice B is incorrect because an Allen's test is not used to assess deep vein thrombosis. Choice D is incorrect because an Allen's test is not done specifically before attempting a cardiac output calculation.