A comprehensive metabolic panel (CMP) includes the same 8 tests as a BMP but also has 6 additional tests that look at proteins and liver enzymes. The six additional tests are albumin, total protein, ALP, ALT, AST, and bilirubin.
In general, a CMP is recommended over just a BMP if there are concerns about liver or kidney function. A CMP may also be ordered if you have a known liver condition and your doctor wants to monitor its progression. If you have no symptoms or health conditions, the doctor will likely consider a BMP sufficient for your routine checkup.