Cholesterol testing is performed to determine the levels of cholesterol and triglycerides in the body. This test is commonly used to check for asymptomatic disease or damage to the body; without explicit symptoms, possible health issues cannot be determined without a test. High cholesterol is a major factor in heart disease, so it is important to check regularly, especially if there are other factors present.
A C-Reactive Protein test is performed to test for inflammation in the body, but it cannot pinpoint the cause. This test would not normally be performed with a cholesterol test because it is a specific test for inflammation or infection.
However, if cholesterol is low but there are symptoms of heart disease, a CRP test could be used to check inflammation in the arteries, which is a factor in heart attacks. Recently, the CRP test has been proven to be effective in predicting heart disease, and so while it is not a standard test yet, it might become as routine as the cholesterol test and be performed at the same time.