Table 4.
Association between reasons for therapeutic drug monitoring order and measured drug levels.
| Reasons for TDM order | Measured level: number of samples (%) | |||||
|---|---|---|---|---|---|---|
| Therapeutic level | Sub-therapeutic level | Toxic level | Undetectable | Unknown | Total | |
| Checking compliance | - | 1 (33.33) | - | 2 (66.67) | - | 3 |
| Suspected sub-therapeutic | 53 (46.90) | 44 (38.94) | 14 (12.39) | 2 (1.77) | - | 113 |
| Suspected toxicity | 16 (45.71) | 5 (14.29) | 14 (40.0) | - | - | 35 |
| Routine monitoring | 60 (58.25) | 26 (25.24) | 11 (10.68) | 5 (4.85) | 1 (0.97) | 103 |
| Total | 129 (50.79) | 76 (29.92) | 39 (15.35) | 9 (3.54) | 1 (0.39) | 254 |