Hepatitis A is a sexually transmitted disease (STD), but it may also be transmitted by close contact with an infected individual's or even contaminated food. Hepatitis A is known as a very contagious disease which attacks the liver which is preventable by a special vaccination. This lab test is commonly used for differential diagnosis of hepatitis and to ascertain for the presence of IgM antibody to hepatitis A virus. There are many symptoms of hepatitis A which can include: Fatigue Nausea Stomach pain/Discomfort Vomiting Jaundice and dark urine Clay-colored stool