Which vital sign would most indicate that the client is not progressing as expected?

A temperature of 104.5°F is an indication of hyperthermia or a significant fever, which could signal an underlying infection, inflammatory response, or other serious condition. Such an elevated body temperature typically suggests that the body is reacting to a heightened level of stress or illness. This is particularly concerning in the context of patient progression since it may indicate that the client’s condition is deteriorating or not improving as expected.

In contrast, a heart rate of 85 beats per minute is well within the normal range for adults and does not suggest any immediate distress or abnormality. Oxygen saturation of 92% indicates hypoxemia but is not as critical as a high fever, especially if the patient is stable otherwise. A blood pressure of 120/80 mmHg is within normal limits and does not raise concerns regarding the client's vital status. Therefore, the elevated temperature serves as the most significant red flag among the vital signs listed.