unit per gram u g of hemoglobin in a galactosemia test definition

The amount of galactose-1-phosphate uridyltransferase (GALT) in a blood sample can be measured in units per grams (U/g) of hemoglobin. A unit is an arbitrary amount agreed upon by scientists and doctors. A gram is an amount equivalent to 1/28 ounce. Hemoglobin is the substance in red blood cells that carries oxygen.