Why do I need an ALT blood test?Your health care provider may have ordered liver function tests, including an ALT blood test, as part of a routine exam or if you have symptoms of liver damage. These may include:Nausea and vomitingJaundiceAbdominal painLoss of appetiteUnusual itchingTirednessBecause ALT in the bloodstream can indicate liver damage before symptoms appear, your health care provider may order an ALT blood test if you are at a higher risk for liver damage. Risk factors for liver disease include:Family history of liver diseaseHeavy drinkingExposure or possible exposure to hepatitis virusObesityDiabetesTaking certain medicines that can cause liver damage
