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Test Code TACRO Tacrolimus (FK506), Blood

Performing Laboratory

Northwell Health Laboratories


Chemiluminescent Microparticle Immunoassay

Reference Values

Tacrolimus testing is performed on the Abbott Architect by chemiluminescent microparticle immunoassay. The therapeutic range of tacrolimus is not clearly defined but target 12-hour trough whole blood concentrations are 5.0-20.0 ng/mL early post transplant. Twenty-four hour trough concentrations are 33%-50% less than the corresponding 12-hour trough.

Test Classification and CPT Coding


Specimen Required

Container/Tube: Lavender-top (EDTA) tube(s)

Specimen Volume: 2 mL of whole blood

Transport Temperature: Room Temperature

Day(s) and Time(s) Performed

Monday through Sunday

Computer Interface Code

PDM # 5302635