A titer is a measurement of the amount or concentration of a substance in a solution. It usually refers to the amount of medication or antibodies found in a patient’s blood and serum.

Measurements of blood titers of certain substances, such as antibodies or medications, can be extremely helpful in determining necessary treatments. Antibody titers can give important information regarding a person’s current immunity to diseases (such as Measles (rubeola), small pox, hepatitis). Medication titers are useful in determining the adequacy of treatments, or if a person is receiving too much medication.

Johns Hopkins patient information

Last revised: December 3, 2012
by Martin A. Harms, M.D.

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