Bilirubin is produced by the liver, spleen, and bone marrow and is also a by-product of hemoglobin breakdown. Total bilirubin levels can be broken into direct bilirubin, which is excreted primarily via the intestinal tract, and indirect bilirubin, which circulates primarily in the bloodstream. ...
Screening Blood testsare used to try to detect a disease when there is little or no evidence that a person has a suspected disease. For example, measuring cholesterol levels helps to identify one of the risks of heart disease. These screening tests are performed on people who may show no sy...