Your physician is correct. At age 50, the only tests that are recommended by major medical societies are indeed a fasting sugar, cholesterol, colon cancer screening tests (colonoscopy or stool cards), and a PSA to be discussed with you.
'Baseline' blood chemistries and blood counts are not routinely recommended, although many physicians order these tests regardless, ignoring the guidelines.
The HMO model where costs are monitored is phased out of many areas. It is unlikely that this is factoring into your physician's decision.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_