Which of the following samples is used to measure blood pH and blood gases?
Capillary blood
Arterial blood
Venous blood
Cerebrospinal fluid
The Correct Answer is B
A. Capillary blood: Capillary blood can be used in some cases, especially in infants, but it is less accurate than arterial blood for measuring blood pH and gases.
B. Arterial blood: Arterial blood is the correct sample for measuring blood pH and gases (such as oxygen and carbon dioxide levels) because it reflects the gas exchange occurring in the lungs.
C. Venous blood: Venous blood is not typically used for measuring blood gases as it does not accurately reflect the oxygenation status of the body.
D. Cerebrospinal fluid: Cerebrospinal fluid is not used for measuring blood pH and gases; it is typically analyzed for conditions affecting the brain and spinal cord.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Pinky: The pinky is not typically used for capillary punctures due to its small size and lower blood flow.
B. Thumb: The thumb is not preferred due to its thick skin and reduced blood flow compared to other fingers.
C. Ring: While the ring finger can be used, the index finger is generally preferred due to its larger surface area and better blood flow.
D. Index: The index finger is preferred for capillary punctures in patients older than 1 year due to its size and ease of access.
Correct Answer is C
Explanation
A. 99.6°F: This temperature is higher than expected for an axillary reading. Axillary temperatures are generally lower than oral temperatures.
B. 98.6°F: This reading matches the oral temperature. However, axillary temperatures are usually lower by approximately 1°F compared to oral temperatures.
C. 97.6°F: This is the correct answer because axillary temperatures tend to be about 1°F lower than oral temperatures.
D. 96.6°F: This reading is lower than typically expected for an axillary temperature and would indicate hypothermia, which is not expected if the oral temperature was normal.
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