Flu, COVID, RSV, and Respiratory Testing

Res­pi­ra­to­ry test­ing uses a quick nasal swab to find out whether symp­toms are from the flu, COVID-19, RSV, or anoth­er virus. Because these ill­ness­es over­lap, know­ing which one it is guides treat­ment and what to do next. It is done for chil­dren and adults, in the office or imme­di­ate care, and many tests give results in 15 minutes.

Find a pri­ma­ry care provider or pediatrician

What is res­pi­ra­to­ry testing?

Res­pi­ra­to­ry test­ing is a swab test that iden­ti­fies which virus is mak­ing some­one sick, in chil­dren and adults alike. A provider col­lects a sam­ple from the nose (or some­times the throat), and the test looks for the flu, COVID-19, RSV, or oth­er res­pi­ra­to­ry virus­es. Some tests check for one virus; many now check for sev­er­al at once from a sin­gle swab. There are two main kinds: rapid tests that give an answer in min­utes, and lab tests that take longer but find small­er amounts of virus.

Why is res­pi­ra­to­ry test­ing done?

Flu, COVID, and RSV cause very sim­i­lar symp­toms: fever, cough, con­ges­tion, and a sore throat, so you usu­al­ly can­not tell them apart by how you or your child feels. Test­ing pins down the cause, which changes what hap­pens next:

• It guides treat­ment, since the flu and COVID can some­times be treat­ed with antivi­ral med­i­cine, while RSV care is supportive
• It helps you take the right pre­cau­tions, like stay­ing home while con­ta­gious, mask­ing when need­ed, avoid­ing close con­tact with high-risk fam­i­ly mem­bers, and prac­tic­ing extra hand­wash­ing and cough hygiene

Where can I get tested?

Test­ing is avail­able in a few places, and the right one depends on age, how sick you are, and timing:

• Pedi­a­tri­cian or pri­ma­ry care provider: for a child, a pedi­a­tri­cian; for an adult, an inter­nal med­i­cine or fam­i­ly med­i­cine provider. Best when you want guid­ance and a treat­ment plan along with the test.
• Imme­di­ate care: a con­ve­nient option for both kids and adults when symp­toms come up after hours, on a week­end, or when you can­not get a same-day appointment.
• At home: rapid anti­gen tests are easy and use­ful, espe­cial­ly a pos­i­tive result, though a neg­a­tive one can be false­ly reas­sur­ing ear­ly on.

For a young child, an old­er or high-risk adult, or any­one who is quite sick, test­ing with a provider is the bet­ter choice.

Find a pri­ma­ry care provider or pediatrician

Find Imme­di­ate care near you

What kinds of res­pi­ra­to­ry tests are there?

Both rapid and lab tests use a sim­i­lar swab; they dif­fer in speed and how much virus they can detect. Here is a quick comparison:

Your provider will pick the test that fits the symp­toms, age, and how the answer will be used. A com­bi­na­tion test is often the most use­ful when sev­er­al virus­es are going around.

How do I prepare?

There is noth­ing spe­cial to do before­hand. No fast­ing and no med­ica­tions to stop; you or your child can eat and drink nor­mal­ly. If you can, note when symp­toms start­ed and any known expo­sures, and bring a home test result if one was already tak­en. That is all it takes.

What hap­pens dur­ing the test?

Col­lect­ing the sam­ple takes just a few sec­onds. A provider inserts a soft swab a short way into the nose (or both nos­trils) and gen­tly rotates it; a throat swab is used for some tests. It can make the eyes water or trig­ger a sneeze, and a deep­er nasal swab is briefly uncom­fort­able, but there is no nee­dle and no pain. Rapid tests are run right there; lab tests are sent out.

What do the results mean?

Results tell you which virus (if any) was found, and the plan fol­lows from there:

• Flu pos­i­tive: an antivi­ral may help, espe­cial­ly start­ed ear­ly or for high­er-risk peo­ple, includ­ing young chil­dren and adults 65 and old­er, along with rest and fluids
• COVID-19 pos­i­tive: fol­low cur­rent guid­ance on stay­ing home until fever-free and improv­ing; an antivi­ral may be an option for high­er-risk chil­dren and adults
• RSV pos­i­tive: care is sup­port­ive, with flu­ids, com­fort, and close atten­tion to breath­ing, which mat­ters most in babies and in old­er or high-risk adults
• Neg­a­tive: it may be anoth­er virus, or too ear­ly to detect; man­age symp­toms and retest or send a lab test if symp­toms are strong or the per­son is high risk

Because a rapid anti­gen test can miss an ear­ly or mild infec­tion, your provider may repeat it or send a more sen­si­tive lab test when the result does not match how sick you or your child seem. They will explain which test was used and what it means for your next steps.

Are there any risks?

There are essen­tial­ly no risks. The swab can briefly tick­le, sting, or make the eyes water, and a deep­er nasal swab is uncom­fort­able for a moment, but there is noth­ing to recov­er from. You or your child can go right back to nor­mal activ­i­ty afterward.

Fre­quent­ly asked questions

Can one test check for flu, COVID, and RSV at once?

Yes. Com­bi­na­tion (mul­ti­plex) tests use a sin­gle swab to check for flu, COVID, and RSV togeth­er, and some­times oth­er virus­es. They are espe­cial­ly use­ful for young chil­dren, old­er or high-risk adults, or any­one quite sick, because they sort out the cause quick­ly with­out mul­ti­ple swabs. Your provider can tell you whether a com­bi­na­tion test makes sense.

What’s the dif­fer­ence between a rapid test and a PCR test?

A rapid anti­gen test looks for viral pro­teins and gives an answer in about 15 min­utes, but it can miss ear­ly or mild infec­tion. A PCR (mol­e­c­u­lar) test looks for the virus’s genet­ic mate­r­i­al and is more sen­si­tive, so it catch­es more cas­es; rapid mol­e­c­u­lar ver­sions run in under an hour, while lab PCR takes longer. Pos­i­tive results from either are reliable.

When should I or my child get tested?

Test­ing is most use­ful once symp­toms start, like fever, cough, or con­ges­tion, and with­in the first few days, when there is enough virus to detect and when treat­ment deci­sions mat­ter most. It also helps after a known expo­sure or before vis­it­ing some­one at high risk. For young chil­dren, old­er adults, high-risk peo­ple, or any­one quite sick, check with a provider about test­ing ear­ly, since antivi­rals work best start­ed promptly.

Are home tests good enough?

Home anti­gen tests can be help­ful, espe­cial­ly a pos­i­tive result, which is reli­able. But a neg­a­tive home test can be false­ly reas­sur­ing, par­tic­u­lar­ly ear­ly in an ill­ness, and home tests do not always cov­er RSV. For young chil­dren, old­er or high-risk adults, or when the result will guide treat­ment, test­ing with a provider is the safer choice.

Where can my fam­i­ly get res­pi­ra­to­ry test­ing in Chicagoland?

Duly Health and Care offers flu, COVID, and RSV test­ing for chil­dren and adults, includ­ing com­bi­na­tion tests, at pedi­atric and pri­ma­ry care offices and imme­di­ate care cen­ters across the Chica­go sub­urbs, often with rapid results fol­lowed with a treat­ment plan dur­ing the same vis­it. Book a vis­it online, or use imme­di­ate care for symp­toms after hours or on a weekend.

Why choose Duly for res­pi­ra­to­ry testing?

When a fever and cough hit, know­ing whether it is the flu, COVID, RSV, or some­thing milder takes the guess­work out of what to do, for a child or an adult. Duly pedi­a­tri­cians, pri­ma­ry care providers, and imme­di­ate care cen­ters can swab, run a rapid or com­bi­na­tion test, and turn the result into a clear plan the same vis­it, whether that is an antivi­ral, sup­port­ive care, or reas­sur­ance and rest.

With pedi­atric and adult pri­ma­ry care plus imme­di­ate care cen­ters across the Chica­go sub­urbs, and easy online sched­ul­ing, get­ting test­ed and cared for is quick for the whole family.

Find a pri­ma­ry care provider or pediatrician

Find Imme­di­ate Care near you

Med­ical­ly reviewed by Alli­son Crouch­er, DO · Last reviewed June 2026