Hello Dear, A routine full body check up can can be done at any diagnostic centre. If you want, you can do it at a good hospital in your area like Wockhardt or Apollo. The price varies depending upon what all tests you want to include and where you want to do the tests. At 26yrs, you can undergo a basic test which includes- Hemogram, liver functions, kidney functions, lipid profile, a sonogram of entire abdomen and pelvis and in case of family history- Random blood sugar.