The nurse is admitting a client with possible tuberculosis (TB). The client is placed in a private room with airborne precautions pending diagnostic test results. Which diagnostic test should the nurse review to confirm the diagnosis of TB?
Chest X-ray or computed tomography (CT).
Hemoccult test on sputum collected from hemoptysis.
Positive purified protein derivative (PPD) skin test.
Sputum culture positive for Mycobacterium tuberculosis.
The Correct Answer is D
Choice A rationale
A chest X-ray or computed tomography (CT) scan can show abnormalities in the lungs that are suggestive of tuberculosis (TB), but they cannot definitively diagnose TB. These imaging tests can reveal changes in the lungs, such as nodules, inflammation, or fluid buildup, which can be caused by TB or other conditions. Therefore, a chest X-ray or CT scan alone is not sufficient to diagnose TB.
Choice B rationale
A hemoccult test on sputum collected from hemoptysis is not a diagnostic test for TB. It is a test for blood in the stool, which can be a symptom of TB but is not specific to TB. Hemoptysis, or coughing up blood, can occur in various conditions, including bronchitis, pneumonia, lung cancer, and TB. The hemoccult test cannot differentiate between these causes, making it an unreliable test for diagnosing TB.
Choice C rationale
A positive purified protein derivative (PPD) skin test indicates exposure to TB but does not confirm active infection. The PPD skin test involves injecting a small amount of tuberculin, a protein derived from Mycobacterium tuberculosis, into the skin. If a person has been exposed to TB, their immune system will react to the tuberculin, causing a raised red bump to appear at the injection site. However, a positive PPD skin test does not necessarily mean that a person has active TB infection. It could also mean that they have been exposed to TB in the past but have successfully fought off the infection. Further testing, such as a sputum culture, is needed to confirm the diagnosis of TB.
Choice D rationale
A sputum culture positive for Mycobacterium tuberculosis is the definitive diagnostic test for TB. It involves collecting a sample of sputum, which is the mucus coughed up from the lungs, and culturing it in a laboratory to see if Mycobacterium tuberculosis, the bacteria that causes TB, grows. This test is highly specific for TB, meaning that a positive result is almost always indicative of TB infection. It is also sensitive, meaning that it can detect TB infection even when there are few bacteria present.
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Correct Answer is B
Explanation
Choice A rationale
Autoimmune response is not the correct type of immune reaction for a bee sting. Autoimmune responses involve the body’s immune system attacking its own tissues, which is not the case with bee stings.
Choice B rationale
IgE response hypersensitivity is the correct type of immune reaction for a bee sting. Bee stings can trigger an IgE-mediated hypersensitivity reaction, leading to symptoms such as rash, difficulty breathing, and low blood pressure. This type of reaction is also known as anaphylaxis.
Choice C rationale
Cell-mediated hypersensitivity is not the correct type of immune reaction for a bee sting. Cell-mediated hypersensitivity involves T cells and is typically associated with conditions like contact dermatitis, not bee stings.
Choice D rationale
Type II hypersensitivity is not the correct type of immune reaction for a bee sting. Type II hypersensitivity involves antibody-mediated destruction of cells, which is not the case with bee stings.
Correct Answer is C
Explanation
Choice A rationale
Restricting fluids is not a primary limitation for clients with Crohn’s disease. Adequate hydration is important for overall health and managing symptoms.
Choice B rationale
Limiting foods high in calcium and iron is not typically recommended for Crohn’s disease. These nutrients are important for maintaining bone health and preventing anemia, which can be concerns for individuals with Crohn’s disease.
Choice C rationale
An elimination diet can help identify trigger foods that may exacerbate symptoms of Crohn’s disease. This approach involves removing certain foods from the diet and gradually reintroducing them to determine which foods cause symptoms.
Choice D rationale
Avoiding gluten is not necessary for all individuals with Crohn’s disease. While some may benefit from a gluten-free diet, it is not a universal recommendation for managing the condition.