The normal value of glycoantigen 199 is generally between 0 and 37,000 U/L, but the reagents, measurement methods, and instruments used to measure CA199 are different in each hospital, so the value of CA199 is more or less different in each hospital, and the reference range of normal CA199 values varies from hospital to hospital. If you want to compare the CA199 value, it is best to compare it with the CA199 value measured by the same hospital, because if you compare it with the value measured by another hospital, it may not be accurate.