• Why is specific monitoring required for children and infants after an organ transplant?

Pediatric patients and infants require careful monitoring because their metabolism of Tacrolimus differs from that of adults.

• What factors may lead a physician to adjust the Tacrolimus dosage?

Dosage adjustments may be necessary based on changes in liver or kidney function, as well as interactions with other medications.

Medical Laboratories

Tacrolimus Drug Level Test

Tacrolimus (FK506) Level Test

Vital monitoring of Tacrolimus levels in the blood for transplant patients. It ensures prevention of organ rejection while avoiding serious side effects on kidneys and nerves.

Trusted medical contentUpdated: 04-09-2026Views: 105LHL-2342

About this service

Quantitative test that measures tacrolimus (FK506) drug concentration in whole blood. Belongs to calcineurin inhibitors (CNI) class, used primarily to prevent graft rejection in organ transplantation (liver, kidney, heart). Requires precise monitoring due to narrow therapeutic range and significant variation in absorption and metabolism among patients.

Conditions and notices

Fasting is not required

Fasting: Not required.

Timing of withdrawal: The sample should be withdrawn before the morning dose (Trough Level). This is the standard monitoring time.

Sample type: Venous blood sample drawn into a tube containing EDTA (purple tube) for whole blood measurement.

Dose recording: Accurately record the time of the last dose and the time of sample withdrawal.

Frequently Asked Questions

Short answers to the FAQs published with this service.

• Why is it important to monitor Tacrolimus levels regularly?

Regular monitoring ensures the drug concentration is within the therapeutic range, which is necessary to prevent organ rejection while minimizing the risk of drug toxicity.

• What symptoms could indicate that Tacrolimus levels are too high?

Potential signs of toxicity include tremors, headaches, seizures, high blood pressure, or a decline in kidney function.

• Do I need to fast before providing a blood sample for the Tacrolimus (FK506) test?

Fasting is not required for this laboratory blood analysis.

• What signs might suggest that the transplanted organ is being rejected?

Tacrolimus Drug Level Test

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Conditions and notices

Frequently Asked Questions

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