A nurse is preparing to administer purified protein derivative (PPD) skin test to another healthcare worker. Which of the following statements about the test is incorrect?

You will need to return in 48-72 hours to have the test read

A positive skin test will mean you need to have a follow up a chest x-ray

"induration of greater than or equal to 10 millimeters means you have been exposed

"induration of greater than or equal to 10 millimeters means you have active tuberculosis

Answer and Explanation

The Correct Answer is D

A. You will need to return in 48-72 hours to have the test read:
This statement is correct. The purified protein derivative (PPD) skin test, also known as the tuberculin skin test (TST), must be read within 48-72 hours after administration. If the test is not read within this timeframe, the results may not be valid, and the test may need to be repeated. The test evaluates the presence of induration (swelling) at the injection site, which indicates a delayed-type hypersensitivity reaction to the tuberculosis antigen.

B. A positive skin test will mean you need to have a follow-up chest x-ray:
This statement is correct. A positive PPD skin test indicates exposure to Mycobacterium tuberculosis (the bacteria that causes tuberculosis). However, a positive result does not necessarily mean the person has active tuberculosis. A follow-up chest x-ray is typically recommended to determine whether active TB disease is present. The chest x-ray helps to assess for signs of active infection, such as lung lesions.

C. "Induration of greater than or equal to 10 millimeters means you have been exposed":
This statement is correct. In the context of a PPD skin test, induration (raised area of the skin) of 10 millimeters or more is generally considered a positive result, indicating exposure to tuberculosis. However, the exact threshold for what is considered positive can vary based on individual risk factors. A positive test means the person has been exposed to the tuberculosis bacteria, but it does not confirm active disease.

D. "Induration of greater than or equal to 10 millimeters means you have active tuberculosis":
This statement is incorrect. A positive PPD skin test result indicates exposure to Mycobacterium tuberculosis, but it does not confirm active tuberculosis (TB) infection. The induration reflects prior exposure or latent infection. To determine if the individual has active TB, additional diagnostic tests such as a chest x-ray, sputum cultures, and possibly a molecular test are required. A positive PPD result does not differentiate between latent TB infection and active TB disease.

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Correct Answer is A

Explanation

A) pH 7.25, CO2 40, HCO3- 16:
In metabolic acidosis, the pH is decreased indicating acidemia. The bicarbonate level is low which is a hallmark of metabolic acidosis. The CO2 level of 40 is within the normal range suggesting that the body is not compensating for the acidosis through respiratory compensation yet. In metabolic acidosis, the body will often try to compensate by increasing respiratory rate to blow off CO2, but this takes time.

B) pH 7.5, CO2 35, HCO3- 30:
In metabolic alkalosis, the pH is increased above 7.45, and the bicarbonate level (HCO3-) is elevated both of which are seen here. The CO2 level of 35 is within normal limits, and while respiratory compensation could increase CO2 in response to metabolic alkalosis,

C) pH 7.5, CO2 30, HCO3- 22:
The pH is increased above 7.45, and the bicarbonate level is within the normal range. The CO2 level of 30 is low, which is typical in respiratory alkalosis, where the body compensates for the increased pH by blowing off CO2.

D) pH 7.25, CO2 55, HCO3- 25:
The pH is low, but the bicarbonate level is normal. The CO2 level is elevated, which is indicative of hypoventilation or inadequate respiratory compensation, commonly seen in respiratory acidosis, where the lungs cannot excrete CO2 effectively

A. 15-30g oral carbohydrates. B. 10% dextrose continuous IV infusion C. Glucagon PO, D. 50% dextrose in water (050W) IV push

Correct Answer is D

Explanation

A. 15-30g oral carbohydrates:
Oral carbohydrates are a first-line treatment for hypoglycemia in a conscious, alert patient who can safely swallow. However, since the patient is unresponsive, administering oral carbohydrates is not an appropriate option. The patient’s inability to swallow safely increases the risk of aspiration, making IV treatment the priority in this case.

B. 10% dextrose continuous IV infusion:
A 10% dextrose IV infusion can be used in the management of hypoglycemia, but in an acute, emergency setting where the patient is unresponsive and their blood glucose is critically low (30 mg/dL), a rapid-acting intervention is needed. A bolus dose of a concentrated solution, such as 50% dextrose, is more appropriate for quickly raising the blood glucose level in this situation, rather than a continuous infusion, which takes longer to achieve an effective increase in glucose.

C. Glucagon PO:
Glucagon is typically used for hypoglycemia in patients who are unconscious or unable to take oral glucose. However, glucagon is typically administered intramuscularly (IM) or subcutaneously (SQ), not orally (PO). Administering glucagon orally is ineffective, as it would not be absorbed by the body in the necessary manner to correct hypoglycemia. Therefore, this option is inappropriate.

D. 50% dextrose in water (50% DW) IV push:
When a patient is unresponsive and their blood glucose level is critically low (30 mg/dL), the priority treatment is an immediate, concentrated source of glucose. Administering 50% dextrose IV push is the most appropriate intervention in this scenario. It provides a rapid and effective increase in blood glucose levels, which is critical for reversing hypoglycemia in an emergency situation. This is the fastest and most direct approach to treating severe hypoglycemia in an unresponsive patient.

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A nurse is preparing to administer purified protein derivative (PPD) skin test to another healthcare worker. Which of the following statements about the test is incorrect?

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