Fundamentals of Nursing Q 285
To evaluate a patient for hypoxia, the physician is most likely to order which laboratory test?
A. Red blood cell count
B. Sputum culture
C. Total hemoglobin
D. Arterial blood gas (ABG) analysis
Correct Answer: D. Arterial blood gas (ABG) analysis
All of these tests help evaluate a patient with respiratory problems. However, ABG analysis is the only test that evaluates gas exchange in the lungs, providing information about a patient’s oxygenation status. An acceptable normal range of ABG values of ABG components are the following,[5][6] noting that the range of normal values may vary among laboratories, and in different age groups from neonates to geriatrics: pH (7.35-7.45) PaO2 (75-100 mmHg) PaCO2 (35-45 mmHg).
Option A: A red blood cell count is a blood test that the doctor uses to find out how many red blood cells (RBCs) a person has. It’s also known as an erythrocyte count. The test is important because RBCs contain hemoglobin, which carries oxygen to the body’s tissues. The number of RBCs one has can affect how much oxygen the tissues receive. The tissues need oxygen to function.
Option B: A sputum culture is a test that checks for bacteria or another type of organism that may be causing an infection in the lungs or the airways leading to the lungs. Sputum, also known as phlegm, is a thick type of mucus made in the lungs.
Option C: The normal range for hemoglobin is: For men, 13.5 to 17.5 grams per deciliter. For women, 12.0 to 15.5 grams per deciliter.