A nurse is caring for a patient who has rheumatoid arthritis. Which of the following laboratory tests are used to diagnose the disease? (Select all that apply)
Antinuclear antibody (ANA) titer
BUN
Urinalysis
Erythrocyte sedimentation rate (ESR)
White blood cell count
Correct Answer : A,D,E
Choice A rationale:
Antinuclear antibody (ANA) titer is a blood test that detects the presence of antinuclear antibodies, which are autoantibodies that target the body's own tissues. These antibodies are often present in people with autoimmune diseases, including rheumatoid arthritis.
While a positive ANA test does not definitively diagnose rheumatoid arthritis, it can support a diagnosis when considered alongside other clinical findings and laboratory tests.

Choice B rationale:
Blood urea nitrogen (BUN) is a blood test that measures the amount of urea nitrogen in the blood. Urea nitrogen is a waste product that is produced when the body breaks down proteins.
BUN levels can be elevated in people with kidney disease, dehydration, or certain other medical conditions. However, BUN is not specifically used to diagnose rheumatoid arthritis.
Choice C rationale:
Urinalysis is a test that examines the urine for various substances, including cells, bacteria, and chemicals.
It can be used to diagnose a variety of conditions, including urinary tract infections, kidney disease, and diabetes. However, urinalysis is not typically used to diagnose rheumatoid arthritis.
Choice D rationale:
Erythrocyte sedimentation rate (ESR) is a blood test that measures how quickly red blood cells settle at the bottom of a test tube.
A high ESR can indicate inflammation in the body.
ESR is often elevated in people with rheumatoid arthritis, as it is a marker of inflammation.
Choice E rationale:
White blood cell count (WBC) is a blood test that measures the number of white blood cells in the blood. White blood cells are part of the immune system and help fight infection.
A high WBC count can indicate an infection or inflammation.
WBC count can be elevated in people with rheumatoid arthritis, as it is a marker of inflammation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Prone The prone position, in which a patient lies facedown, is beneficial for patients with pneumonia as it helps shift the fluid away from the back of the lungs, allowing more air to enter. It also improves ventilation in the lungs and reduces the risk of lung collapse. However, this position is not the most effective for maximum lung expansion in pneumonia patients.
Choice B rationale:
Side-lying Lateral positioning, in which the patient lies on one side, is recommended for patients suffering from pneumonia in just one lung. In this position, the pneumatic lung is exposed to a higher blood flow, resulting in greater oxygenation levels and improved lung expansion. This position can also help prevent lung injury by helping regulate pressure and improve aeration.
But again, this is not the most effective position for maximum lung expansion in pneumonia patients.
Choice C rationale:
Supine The supine position, where the patient lies flat on their back, is not the best position for a pneumonia patient. This position can cause the secretions to pool in the lungs, making it harder for the patient to breathe and potentially worsening their condition. Choice D rationale:
Upright Elevating the head of the bed is an effective way to improve lung expansion and oxygenation levels in pneumonia patients. This position also helps eliminate airway obstruction, reduces pressure on the lungs, and promotes drainage of fluids from the lungs. Therefore, the upright position is the most recommended for maximum lung expansion in pneumonia patients.
Correct Answer is D
Explanation
Choice A rationale:
Numbness in the fingers is not typically a symptom of respiratory acidosis. This condition is characterized by an excess of carbon dioxide (CO2) in the body, which leads to a decrease in the pH of your blood, making it too acidic. Numbness in the fingers could be a symptom of other conditions, such as peripheral neuropathy or Raynaud’s disease.
Choice B rationale:
Abdominal pain is also not a common symptom of respiratory acidosis. While abdominal discomfort can occur in a variety of conditions, it is not directly associated with the acid-base balance disturbance that characterizes respiratory acidosis.
Conditions that commonly cause abdominal pain include gastrointestinal issues like gastritis, appendicitis, or gallstones.
Choice C rationale:
Dry skin is not a symptom of respiratory acidosis. The skin’s condition can be influenced by many factors, including hydration, environmental conditions, and certain skin conditions like eczema or psoriasis. Respiratory acidosis, on the other hand, is a condition that affects the acid-base balance in the body due to alveolar hypoventilation.
Choice D rationale:
Lethargy is indeed a symptom of respiratory acidosis. This condition occurs when the lungs can’t remove enough CO2, leading to an increase in the acidity of the blood. Symptoms of respiratory acidosis vary according to how long you’ve had the condition and its severity. Initial symptoms can include anxiety, blurred vision, and shortness of breath. If left untreated or in severe cases, symptoms may include fatigue, lethargy, delirium, or confusion. Therefore, a nurse assessing a patient with respiratory acidosis should anticipate lethargy among other symptoms.
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