Antistreptolysin O Titer is a blood test used to determine if you have an infection caused by a group A streptococcus bacteria. Learn more about this test, when it's needed, and what the results mean.

Getting a positive blood titer test proves immunity, and with your positive result, you don’t have to get the vaccine (which could potentially be in short supply in Texas and needed for children ...

Kelly Bartle, a Miami/Fort Lauderdale medical social worker, is scheduled for a measles titer test on Saturday. “I received two doses of the vaccine over 30 years ago,” she said.

Thus, if an antistreptolysin-O titer of less than 159 units had been used to exclude active rheumatic fever in the Group 2 patients with arthritis, only 4 cases out of 227 (1.8 per cent) would ...

A test called the Titer test, which measures the levels of antibodies in a blood sample, is available at some national chain pharmacies including CVS and Walgreens.