A nurse is collecting data from an older adult client who has a potassium level of 3.2 mEq/L. Which of the following findings should the nurse expect?

Palpable area of induration, greater than 10 mm (0.4 in) in diameter. This indicates a positive tuberculin skin test (TST) reaction for a person with no known risk factors for TB infection. A positive TST reaction means that the person has been infected with Mycobacterium tuberculosis, the bacterium that causes TB disease, and needs further testing to confirm the diagnosis and rule out active TB disease.

The other choices are not correct because:

- Choice A. Nonpalpable area of redness, less than 5 mm (0.2 in) in diameter. This indicates a negative TST reaction for any person, regardless of their risk factors for TB infection. A negative TST reaction means that the person has not been infected with Mycobacterium tuberculosis or has a very low level of immune response to the bacterium.

- Choice B. Area of ecchymosis, greater than 12 mm (0.5 in) in diameter. This indicates a bruise or bleeding under the skin, not a TST reaction. Ecchymosis is not caused by the injection of tuberculin purified protein derivative (PPD) into the skin, but by trauma or injury to the blood vessels.

- Choice C. Tenderness at the injection site. This indicates a mild local reaction to the injection of tuberculin PPD into the skin, not a TST reaction. Tenderness is not measured in millimeters of induration (firm swelling), which is the standard way of reading TST results.

The client should wear a mask during transport to prevent the spread of infectious droplets. The nurse should wear appropriate personal protective equipment (PPE) based on the precautions required for the specific client, which in this case would be a mask. The nurse does not need to wear a gown as droplet precautions do not require the use of a gown during transport.

The correct answer is choice C, the client should wear a mask during transport.

Choice A rationale:

The client wearing a gown during transport is not typically necessary for droplet precautions unless there is a risk of the gown becoming contaminated with infectious material. Gowns are primarily used to protect the healthcare worker or other patients if there is direct contact with the patient.

Choice B rationale:

While the nurse should wear a mask if they will be within close proximity to the client, the primary concern in droplet precautions is to prevent the spread of infection from the client, who is the source of the droplets.

Choice C rationale:

The client should wear a mask during transport to contain respiratory secretions and minimize the risk of droplet spread, as droplets can be disseminated by coughing, sneezing, or talking. This is a key component of source control in droplet precautions.

Choice D rationale:

Similar to choice A, the nurse wearing a gown during transport is not a standard requirement for droplet precautions unless there is anticipated contact with the patient or their environment that might result in contamination.

In summary, the primary goal of droplet precautions is to prevent the spread of infections through large respiratory droplets that are expelled by the client. Therefore, having the client wear a mask is the most effective measure among the options provided to reduce the risk of transmission during transport.