Methylmalonic acid (MMA) is a substance that is created when your body digests protein. The amount of vitamin B12 in your body controls how much MMA your body makes. A high amount of MMA typically ...

If a doctor suspects that a person may have hepatitis B, they will likely order a single blood test to check for the condition. This test is called a hepatitis B titer panel, and it consists of three ...

Hepatitis B tests involve a blood sample collection. People can purchase a test in person or get one from an online company. Companies that sell tests offer instructions and tools a person will need ...