[Often referred to by brand name (see MedlinePlus Drug Information)]
At a Glance
Why Get Tested?
To determine the level of the drug tacrolimus in your blood in order to establish a dosing regimen, maintain therapeutic levels, and detect toxic levels
When to Get Tested?
As soon as tacrolimus therapy begins, frequently at first, then at regular intervals to monitor concentrations over time
A blood sample drawn from a vein in your arm
Test Preparation Needed?
The sample should be collected 12 hours after your last dose and immediately prior to your next dose or as directed by your health practitioner.