A nurse is at a social event when another guest suddenly coughs weakly once, grasps her throat with her hands, and is unable to speak.
What action should the nurse take?

Choice A rationale
Applying the pulse oximeter probe to the toe might not provide an accurate reading if the client has poor peripheral circulation. Additionally, thickened toenails can interfere with the reading.
Choice B rationale

Edema in the hands can affect the accuracy of a pulse oximeter reading. The probe might not fit properly or provide a reliable reading if the finger is swollen.
Choice C rationale
Applying the pulse oximeter probe to a skin fold is not recommended. The probe needs to be placed on a relatively flat, thin area of skin to accurately measure oxygen saturation.
Choice D rationale
The earlobe is a suitable alternative site for pulse oximetry if the fingers and toes are not viable options. The earlobe is typically less affected by peripheral vasoconstriction, which can occur with hypothermia, certain medications, and certain diseases. Therefore, Choice D is the correct answer.

Choice A rationale

Mycoplasmal pneumonia, also known as walking pneumonia, is typically not an airborne disease. Standard precautions, including the use of a surgical mask, are usually sufficient when caring for these patients.
Choice B rationale
Scarlet fever is caused by group A Streptococcus bacteria, which are spread through respiratory droplets. Standard precautions, including the use of a surgical mask, are usually sufficient when caring for these patients.
Choice C rationale
Tuberculosis is an airborne disease. Healthcare providers should wear an N95 respirator when caring for a client with tuberculosis to protect themselves from inhaling the bacteria.
Therefore, Choice C is the correct answer.
Choice D rationale
Scabies is caused by a mite and is spread through direct skin-to-skin contact. It is not an airborne disease, so an N95 respirator is not necessary when caring for a client with scabies.