A client who abused intravenous drugs was diagnosed with the human Immunodeficiency virus (HIV) several years ago.
The nurse explains that the diagnostic criterion for acquired immunodeficiency syndrome (AIDS) has been met when the client:

Choice A rationale:
Coughing and deep breathing: These techniques directly promote airway clearance by mobilizing and expelling secretions from the lungs. They are essential for clients with pneumonia, as the buildup of secretions can obstruct the airways and impair gas exchange.
Hydration maintenance: Adequate hydration helps to thin secretions, making them easier to cough up and clear from the lungs. It also helps to prevent dehydration, which can worsen respiratory symptoms.

Choice B rationale:
Keeping the head of the bed elevated: This can help to improve breathing by decreasing the work of breathing and promoting lung expansion. However, it is not the most effective intervention for directly clearing secretions from the lungs.

Choice C rationale:
Preparation for insertion of a tracheostomy tube: This is a more invasive intervention that may be necessary in severe cases of airway obstruction. However, it is not the priority intervention for a client with ineffective airway clearance related to pneumonia.

Choice D rationale:
Providing supplemental oxygen: This can help to improve oxygenation in clients with pneumonia. However, it does not directly address the problem of ineffective airway clearance.

Choice A rationale:
Serum creatinine is a waste product that is produced by muscle metabolism and is normally excreted by the kidneys.
When kidney function is impaired, creatinine levels in the blood increase, making it a sensitive and specific indicator of renal function.
It is considered one of the most reliable markers for assessing kidney function and is routinely used to screen for and monitor kidney disease.

Choice B rationale:
Serum sodium is an electrolyte that is regulated by the kidneys, but it is not a direct measure of renal function. Sodium levels can be affected by various factors, including fluid intake, medications, and hormonal imbalances.
While abnormal sodium levels can sometimes be a sign of kidney dysfunction, they can also occur due to other conditions, making it less specific as an indicator of renal function.
Choice C rationale:

Blood urea nitrogen (BUN) is another waste product that is produced by the breakdown of proteins and is normally excreted by the kidneys.
However, BUN levels can be influenced by factors other than kidney function, such as dietary protein intake, dehydration, and gastrointestinal bleeding.
This makes BUN less specific than serum creatinine as a marker of renal function.

Choice D rationale:
Urine-specific gravity measures the concentration of solutes in urine, which can provide some information about kidney function.
However, it is not as sensitive or specific as serum creatinine.
Urine-specific gravity can be affected by factors such as fluid intake and hydration status, which can make it less reliable as an indicator of renal function.