text_1: This patient has a history of rectal cancer, status post surgery.  Her carcinoembryonic antigen (CEA) was approximately 60 a year ago.  When should I do another carcinoembryonic antigen?
text_2: Rectal cancer, status post surgery. Carcinoembryonic antigen (CEA) approximately 60 a year ago. When to do another carcinoembryonic antigen?