I am post pancreas transplant recipient for nearly 17 years! I have been on Tacrolimus the whole time. I was initially told that the Tacrolimus lab level should be 5 - 7. I have faithfully gotten the Tacrolimus level drawn ever since. The last level was 4.4. My provider sent me a letter that stated my level and also showed reference ranges for kidney, liver and heart transplants (nothing about pancreas transplants!) and told me my “level is fine”.