Antibody Titer

A titer is a measurement of the amount or concentration of a substance in a solution. It usually refers to the amount of medicine or antibodies found in a patient's blood.

In diagnosis titer is a measurement used to show the presence and amount of antibodies in blood. The test shows the amount of antibodies are in the blood. The antibodies can develop as a result of  a particular type of tissue, cell, bacteria, virus, or other external substance.
 

One common function of the antibody titer is to detect antibodies that the body has made to fight off a certain disease. Sometimes this is done to check whether a person has gotten a vaccine against a disease. It can also see if someone has natural immunity due to having the disease in the past. This test may be useful in the diagnosis of the following diseases:

 Epstein-Barr virus infection,
 hepatitis A, hepatitis B, hepatitis C, or hepatitis D,
 Lyme disease
 rubella, or German measles
 syphilis

Another major function of the test is to show antibodies that are attacking ones own body. It is used to diagnose many autoimmune diseases such as

SLE
Sjogren's syndrome
scleroderma
polymyositis
rheumatoid arthritis
mixed connective tissue disease
myasthenia gravis
Hashimoto's Thyroiditis