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Test Code TACRO Tacrolimus (FK506)

Performing Laboratory

MaineGeneral Medical Center

Useful For

Measurements of tacrolimus are used as an aid in the management of tacrolimus therapy in renal and hepatic transplant patients.

Specimen

Specimen required:  whole blood drawn in a lavender top EDTA tube

Minimum volume:  2 mL

Specimen stability:  7 days when stored at room temperature or at 2-8°C

                                    6 months when stored at -20°C

Reference Values

Therapeutic ranges for 12 hour samples:

≤3 months post transplant: 12.0-15.0 ng/mL

3-12 months post transplant:  8.0-12.0 ng/mL

>12 months post transplant:  3.0-6.0 ng/mL

Potentially toxic:  15.1-20.0 ng/mL

Toxic: >20.0 ng/mL

Critical result (automatic call back):  >20.0 ng/mL

CPT Coding

80197

Day(s) Test Set Up

Monday through Sunday