A blue Test Line and a red Control Line is a positive result. A positive result means that the assay detected Group A Streptococcus antigen in the specimen. Note that the blue line can be any shade of color and can be lighter or darker than the line in the picture.

How do you know if a strep test is positive?

A doctor cannot tell if someone has strep throat just by looking at his or her throat. A rapid strep test involves swabbing the throat and running a test on the swab. The test quickly shows if group A strep is causing the illness. If the test is positive, doctors can prescribe antibiotics.

How do you read throat culture results?

A negative throat swab culture means that no infectious bacteria are present in your throat. A positive test indicates the presence of streptococci (the bacteria that causes strep throat) or other bacteria. If the test result is positive, the results can be used to determine which bacteria are causing the infection.