Despite the fact that these tests are completed in just a few minutes, you won't know the results right away. Your primary care physician will let you know when your results are ready, but most results are ready in a week or two. Many different tests will be performed by your primary care doctor, including a complete blood count and a urinalysis. In primary care settings, these can be used as diagnostic or screening tools. Other common lab tests will also be used by primary care doctors for screening and monitoring. What tests will be ordered will depend on what is being checked, symptoms and family medical history may also direct doctors toward running certain tests.