The basic Diagnostic tests that a diabetic patient needs to undergo at least once a year are as follows. CBC ESR CUE FBS PPBS HBA1C EGFR KFT LFTLIPID PROFILE TSHVITAMIN D3 VITAMIN B12 ECG 2D ECHO USG ABDOMEN WHOLE + PELVIS CXR PA Based upon these results we may need to perform some of these test every 3 to 6 months or even monthly till needed. And also based upon the results we may sometimes need to do some other specific test.