What are the scheduled times for "q 4hrs" medication administration?

The phrase "q 4hrs" indicates that medication should be administered every four hours. When determining the scheduled times, it is important to establish a starting point and then add four-hour intervals accordingly.

If we take an initial time of 0900 as the starting point, the subsequent administration times would be calculated as follows:

• The first administration is at 0900.

• The second would be four hours later, at 1300 (which is 1:00 PM).

• The third administration would be at 1700 (5:00 PM).

• The fourth, four hours after 1700, brings us to 2100 (9:00 PM).

• Continuing this method leads us into the next day, where the next time would be at 0100 (1:00 AM).

These times align perfectly with option C, which lists 0900, 1300, 1700, and then 0100. This clearly demonstrates the correct interpretation and application of the "q 4hrs" schedule, adhering to the required time intervals for medication administration. The other options present schedules that do not follow the consistent four-hour intervals starting from a typical morning time.