When is a trough concentration collected for therapeutic drug monitoring?
1Immediately after the dose is given
2Immediately before the next scheduled dose✓ 정답
3At the midpoint between doses
4At any convenient time
해설
The trough concentration is collected immediately before the next dose, the point at which the drug concentration in the body is lowest. It is the value used to judge whether a therapeutic concentration is being maintained. The peak is drawn a defined interval after the dose, depending on the drug and route.