A nurse is caring for a client who has a history of frequent use of large amounts of alcohol. Which serum laboratory value is consistent with the client's history? A serum:

A. The highest effective drug concentration in the blood is associated with peak levels, not trough levels.

B. The point at which medication becomes toxic is associated with peak levels, not trough levels.

C. The trough level is associated with the lowest blood serum drug concentration, just before the next dose is administered.

D. The point at which the medication concentration is half of what it was when administered is associated with the half-life of the drug, not trough levels.

The vastus lateralis muscle, located on the lateral aspect of the thigh, is one of the preferred sites for intramuscular injections. To administer an injection at this site, one should divide the thigh into thirds from the hip to the knee and choose the middle third as the injection area. It's important to inject into the lateral muscle body, avoiding the anterior thigh. The needle should be inserted at a 90-degree angle to the skin, ensuring that it penetrates deep into the muscle tissue. This site is particularly recommended for infants and children, as it is typically well-developed and can absorb the medication effectively. For adults, the vastus lateralis is also a safe choice, especially when other sites are not available or not recommended.