What time should a client expect their serum glucose to increase after taking insulin glargine, administered at 2100?

Insulin glargine is a long-acting insulin that is typically administered once a day, and it works to provide basal insulin levels throughout the day and night. After administration, insulin glargine takes time to reach its peak effect, which is generally around 6 to 8 hours following the injection.

Given that the insulin is administered at 2100 (9 PM), the serum glucose levels are expected to start changing as the insulin begins to take effect during the night. By the next day, around 2030 (8:30 AM), the client can expect their serum glucose to begin showing an increase due to the waning effect of the insulin overnight, as the insulin glargine begins to lose its efficacy after 24 hours. This option accurately reflects the timing of how long insulin glargine works in the body and when the client should be particularly aware of their glucose levels post-administration.

Other options, such as around 2100 the next day and around 3000 the next day, imply an unrealistic timing of glucose increase based on the pharmacokinetics of insulin glargine, while around 1500 the next day misses the context of the expected glucose fluctuation based on the action and duration of the