Samples are usually collected in pairs as Trough level (within 1 hr before the next dose) and Peak level (1 hr post end of infusion).
If once daily dosing is used, a single sample may be collected between 8 and 12 hr post dose (random). Samples will be registered as “pre dose (trough)” or “post dose (random)”.
Please state whether the sample is pre or post dose.
Waikato Hospital Laboratory