People on Humira should probably be having at least monthly blood tests to monitor for potential issues, as should probably be the case for all immunosuppressants. Assuming Medicare count Humira as a regular immunosuppressant, you will be eligible for free CBC & ESR tests.
Although fairly unlikely, there are risks of complications eg opportunistic infections exacerbated by the Humira that you may not be able to pick up easily. Blood tests will often show early warning signs before these get too bad, so I for one would be insisting on monthly blood tests unless my specialist & GP could persuade me otherwise.
Although I would be surprised if he had not just simply forgotten, if your GI doesn't seem interested in doing them or he's not easy to get in contact with, and you have contact with a good GP, it may be better to get them to write up the forms, you can always get the copies sent between them anyway
