A rapid strep test involves a quick throat swab. Within minutes, the test can show
the presence of group A streptococcus bacteria, which can cause strep throat
and other infections (including scarlet fever, abscesses, and pneumonia).
Strep throat is a bacterial infection that affects the back of the throat and the
tonsils, which become irritated and swollen, causing a sore throat that's especially
painful when swallowing. Your child may get white or yellow spots, or a coating
on the throat and tonsils, and the lymph nodes in the neck may swell and become tender
Strep throat is most common among 5- to 10-year-olds. Up to 20% of schoolchildren
may be carrying the bacteria but show no symptoms, though they can still spread the
infection. In kids, strep throat may cause body aches, headaches, stomachaches, nausea,
vomiting, or listlessness. The infection usually doesn't include other cold symptoms
(such as sneezing, coughing, or a runny or stuffy nose).
Most sore throats in kids are caused by viral infections, which clear up on
their own without antibiotic treatment. While strep throat sometimes can go away within
a few days without treatment, doctors prescribe antibiotics to prevent related complications
that can be serious, such as rheumatic fever.
Why It's Done
The rapid strep test is done to help quickly see whether a child's sore throat
is caused by a strep infection vs. other germs (usually viruses) that don't require
A doctor may do a rapid strep test done if a child:
has symptoms of a strep throat infection and doesn't have symptoms typical of
a virus infection
has a sore throat and has been exposed to someone known to have a strep throat,
or if there are many strep throat cases in the community
Sometimes, doctors do a throat
culture instead of a rapid strep test. A throat culture is more accurate than
a rapid strep test, but the results take longer (2-3 days) to come back.
Encourage your child to stay still during the procedure so the health professional
can collect enough secretions for an accurate test. Be sure to tell your doctor if
your child has taken antibiotics recently, and don't have your child use mouthwash
before the test as it may affect test results.
A health professional will ask your child to tilt his or her head back and open
his or her mouth as wide as possible. Your child's tongue will then be pressed down
with a flat stick (tongue depressor) to clearly examine the mouth and throat. A clean,
soft cotton swab will be lightly brushed over the back of the throat, around
the tonsils, and over any red or sore areas to collect a sample.
Sometimes, two swabs will be used so the second swab can be sent for a throat culture
if the rapid strep test results are negative. Swabbing will last only a few seconds.
The secretions on the swab are then analyzed in the office or a laboratory.
You might want to hold a young child on your lap during the procedure to prevent
him or her from moving around, which could make it difficult for the health professional
to get a good sample.
What to Expect
Your child may feel like gagging when the swab touches the back of the throat.
If your child's throat is sore, the swabbing may cause slight pain temporarily.
Getting the Results
Test results are usually available in about 15 minutes. If the rapid strep test
indicates a strep infection, the doctor usually will prescribe antibiotics. Keep in
mind, though, that up to a third of negative rapid strep test results are false (meaning
someone actually has a strep throat infection even though the rapid strep results
were negative). A throat culture may then be done to ensure accuracy.
Throat swabs can be uncomfortable, but no risks are associated with a rapid strep
Helping Your Child
Explaining the test in terms your child can understand might help ease any fear.
During the test, encourage your child to relax and stay still so the health professional
can easily swab the throat and tonsils.
If You Have Questions
If you have questions about the rapid strep test, speak with your doctor.