All content on Lab Tests Online has been reviewed and approved by our Editorial Review Board.
At a Glance
Why Get Tested?
When to Get Tested?
When you have a routine physical exam or when you experience unexpected weight loss or fatigue, or when a healthcare practitioner thinks that you have symptoms of a liver or kidney disorder
A blood sample drawn from a vein in your arm or by fingerstick (adults and children) or heelstick (newborns)
Test Preparation Needed?