Your liver plays a vital role in your health. It is one of the primary organs responsible for filtering blood, which is why it is important that your liver is functioning properly. In order to diagnose any damage or illness in your liver, physicians frequently ordered tests known as liver function tests (LFT). The results of this test are to help determine whether your liver is working correctly, if you have liver damage from drinking too much alcohol or taking certain medications, or if you have returned to normal health after having serious health conditions.