What is this test?
This therapeutic drug monitoring test measures a medicine concentration to help the clinician assess the safety and effectiveness of prescribed treatment.
Why might it be ordered?
- To monitor a concentration during established treatment.
- After a dose change or a change in other medicines or health status, when requested by the treating clinician.
- When an adverse effect or inadequate response is suspected, without assuming that the concentration alone explains it.
What sample is needed?
A blood specimen is normally used. Timing in relation to the last dose is essential and must be confirmed with the laboratory or treating clinician.
How should you prepare?
Do not skip, double, or move a dose on your own. Record the exact time of the last dose and of specimen collection, and follow your individual instructions.
How should you understand the result?
The reported concentration is compared with ranges appropriate to the medicine, indication, and collection time. A clinician must relate it to your dose and condition.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.