Exams and Tests

An accurate diagnosis of strep throat is a must. Because the doctor cannot make a definite diagnosis of strep throat on physical examination, a test may be required.

• Rapid antigen test: A rapid strep test can be done in the doctor's office. A swab is used to take a sample of the fluids from the back of the throat. The test only takes about 15 minutes. If the result is positive for streptococcal bacteria, the diagnosis is confirmed, but a negative test result does not rule out strep throat. Rapid tests have an error rate of about 20%.

• Throat swab culture: If the rapid test result is negative, a throat swab is sent to the lab for further testing. This takes 24-48 hours. If streptococcal bacteria grow during this time, the test result is positive, and the diagnosis of strep throat is confirmed.

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Strep Throat - Length Symptoms Lasted

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