My rheumatologist said i have abnormal protein in my blood. he refered me to a hemotologist. my appointment is at the cancer center. is this cancer?

Not necessary: Not necessarily. Just because you go to see a doctor at a cancer center does not mean you have a cancer. Majority of hematologists ( blood specialists) are also oncologists ( cancer specialist). We do see different kinds of blood disorders as well as different cases of cancer- blood and solid tumor.

Unknown: Unknown from the information given. That "abnormal protein" may be a monoclonal protein such as mgus -- monoclonal gammopathy of undetermined significance -- or myeloma, or any number of other things. Hematologists see diseases besides cancer. It would be great if they were called blood centers & cancer centers to clarify.

An excess of: A gamma globulin called a "spike" may be associated with a plasma cell disorder, such as myeloma or macroglobulinemia. Wait to see the hematologist, let them assess the protein and determine the need for a bone marrow exam.