Test directory: Tacrolimus

Ordering Code 8521
Test Name Tacrolimus
Alias FK506
Prograf
Preferred Specimen Whole Blood
Preferred Container EDTA, K2 (Lavender)
Optimum Volume 3 mL
Transport Requirements Oahu: Refrigerated
Airline: Refrigerated
Send frozen if transport >7 Days
Specimen Stability Ambient; 5 Days
Refrigerated: 7 Days
Frozen: 3 Months
Rejection Criteria Heparinized
Avail. Stat NO
Methodology Roche Cobas Electrochemiluminescence Immunoassay (ECLIA)
Reference Lab  Clinical Laboratories of Hi

Reference range(s)

The reference ranges listed below are valid on this date of February 21, 2026.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Tacrolimus ALL 5-20 5-20 ng/mL

The reference...
The reference range refers to a trough level drawn 12 hr after last dose or just prior to next dose, and should be interpreted by a clinician experienced in immunosuppresive therapy

Toxicity may occur at levels within the therapeutic range

Testing performed on the Roche cobas e immunoassay analyzer (electrochemiluminescence immunoassay -ECLIA). Results obtained with different manufacturers cannot be interchanged due to differences in assay methods and reagent specificity

Note: Change in method effective 3/17/20.
Note1

Note1:


The reference range refers to a trough level drawn 12 hr after last dose or just prior to next dose, and should be interpreted by a clinician experienced in immunosuppresive therapy

Toxicity may occur at levels within the therapeutic range

Testing performed on the Roche cobas e immunoassay analyzer (electrochemiluminescence immunoassay -ECLIA). Results obtained with different manufacturers cannot be interchanged due to differences in assay methods and reagent specificity

Note: Change in method effective 3/17/20..