PCR vs. Rapid: Which COVID Test Should You Take?

With Omicron subvariants continuing to evolve and spread, more and more people are testing positive for COVID across the US and Illinois.

As of the latest update, eight counties in Illinois were listed under "high" COVID transmission risk, and 39 counties were listed as "medium." In Chicago alone, Dr. Allison Arwady, Chicago Department of Public Health Commissioner, said during a Facebook Live last week that the city is currently averaging nearly 1,200 positive COVID cases each day -- up 27% from a week ago.

And that's not including those who only test at-home.

"You can see our positivity is up to 6.2% and continuing to rise. So that's why I'm guessing most of you know somebody who's had COVID pretty recently, or even as it now. There's a lot of COVID around."

As cases continue to rise, here's a refresher on the two types of viral tests you can take if you believe you've been exposed to COVID or are experiencing symptoms.

What to Know About PCR Tests

A laboratory test, more commonly referred to as a PCR test takes 1-3 days to deliver results, and is usually done by making an appointment with a pharmacy, your health care provider or in a community health clinic.

Samples can either be in the form of a nasal swab or saliva.

According to the Centers for Disease Control and Prevention, PCR tests are reliable for people both with and without COVID symptoms and no follow-up tests are required.

When a PCR Test Might Not Be the Best Option

According to the CDC, some people who contract COVID-19 can have detectable virus for up to three months.

And while a PCR test is more likely to continue picking up the virus following an infection, that doesn't necessarily mean a positive test equates to a person is still being contagious.

"PCR test can stay positive for a long time," Arwady said in March.

"Those PCR tests are very sensitive," she added. "They keep picking up dead virus in your nose for sometimes for weeks, but you can't grow that virus in the lab. You can't spread it, but it can be positive."

For those isolating due to a COVID infection, there is no testing requirement to end isolation. However, the CDC recommends using a rapid antigen test for those who choose to take one.

Arwady said that guidance is likely related to determining whether or not someone has an "active" virus.

"If you did want to get a test on please don't get a PCR. Use a rapid antigen test," she said. "Why? Because the rapid antigen test is the one that will look to see...do you have a high enough COVID level that you are potentially infectious? Now, a PCR test, remember, can pick up up sort of traces of the virus for a long time, even if that virus is bad and even if it's not potentially transmitting."

What to Know About Rapid Tests

Rapid, or antigen tests, are more commonly referred to as at-home COVID tests. Samples for a rapid test are usually taken by nasal swab, and results are generally produced between 15-30 minutes.

Since results may be less reliable for people without symptoms, an additional or follow-up test may be required, the CDC says.

When a Rapid Test Might Not Be the Best Option

According to the CDC, those who develop symptoms should get tested as symptoms develop, but if a test is negative and symptoms persist, another test might be needed a few days later -- particularly for those who use at-home test kits.

"So if someone is having symptoms and they get a negative test, one, it depends on the severity right? If you're having severe symptoms we don't want you to just do a home test." Dr. Nimmi Rajagopal, the associate chair of the Department of Family and Community Medicine for Cook County Health, told NBC 5 during the omicron surge late last year.

"We want you to call your doctor's office and make sure that they have an opinion here because there are of course other things like the flu that are out there that can mimic symptoms or have similar symptoms. But if you're having symptoms and they're kind of mild and lingering and you use the [at-home] test and it's negative, we want you to take the precautions and then retest in three to five days. And that's why most of these kits actually come with two tests."

Additionally, while those who test positive using an at-home test are asked to follow the latest CDC guidelines and communicate those results to their healthcare provider, that doesn't always happen.

"It's a fiction that we've ever counted every COVID test," Arwady has said.

When Should You Get a COVID Test?

Regardless of symptoms or vaccinations, those who are exposed to someone with coronavirus should get tested at least five days after their exposure.

The CDC notes that tests "are best used early in the course of illness to diagnose COVID-19 and are not authorized by the U.S. Food and Drug Administration to evaluate duration of infectiousness."

How Long After COVID Exposure Could Symptoms Start?

According to the CDC, COVID symptoms can appear anywhere from two to 14 days after someone is exposed to the virus.

But guidelines state those who were exposed should watch for symptoms until at least 10 days after the last close contact with someone who had COVID.

Anyone with symptoms should get tested.

As BA.2 cases continue their dominance across the Midwest and U.S., here's a look at the latest symptoms to watch for.

What is the Incubation Period for COVID and How Long Are You Contagious?

"A person with COVID-19 is considered infectious starting two days before they develop symptoms, or two days before the date of their positive test if they do not have symptoms," according to the CDC.

Regardless of symptoms, those who test positive are advised to take specific precautions for at least 10 days.

"Lets say somebody is diagnosed with COVID and they are in a setting during a time that they might be infectious, we know that with COVID, for the first five days you need to be isolated because you can definitely be spreading COVID at that point," Arwady said during a recent Facebook Live

How Long Should you Quarantine or Isolate?

First, you'll need to know the difference between whether you must quarantine or isolate. Those who believe they have been in contact with someone who has COVID and are unvaccinated should quarantine. Those who test positive, regardless of vaccination status, must isolate, according to the CDC.

Close contact is defined by the CDC and the Illinois Department of Public Health as "someone who was less than 6 feet away from an infected person for a cumulative total of 15 minutes or more over a 24-hour period."

Here's the breakdown:

Quarantine

If you come into close contact with someone with COVID-19, you should quarantine if you are not up-to-date on COVID-19 vaccines or are unvaccinated. For these individuals, the CDC and IDPH recommend you:

• Stay home and away from other people for at least 5 days (day 0 through day 5) after your last contact with a person who has COVID-19. The date of your exposure is considered day 0. Wear a well-fitting mask when around others at home, if possible.
• For 10 days after your last close contact with someone with COVID-19, watch for fever (100.4◦F or greater), cough, shortness of breath, or other COVID-19 symptoms.
• If you develop symptoms, get tested immediately and isolate until you receive your test results. If you test positive, follow isolation recommendations.
• If you do not develop symptoms, get tested at least 5 days after you last had close contact with someone with COVID-19.
  • If you test negative, you can leave your home, but continue to wear a well-fitting mask when around others at home and in public until 10 days after your last close contact with someone with COVID-19.
  • If you test positive, you should isolate for at least 5 days from the date of your positive test (if you do not have symptoms). If you do develop COVID-19 symptoms, isolate for at least 5 days from the date your symptoms began (the date the symptoms started is day 0). Follow recommendations in the isolation section below.
  • If you are unable to get a test 5 days after last close contact with someone with COVID-19, you can leave your home after day 5 if you have been without COVID-19 symptoms throughout the 5-day period. Wear a well-fitting mask for 10 days after your date of last close contact when around others at home and in public.
  • Avoid people who are have weakened immune systems or are more likely to get very sick from COVID-19, and nursing homes and other high-risk settings, until after at least 10 days.
• If possible, stay away from people you live with, especially people who are at higher risk for getting very sick from COVID-19, as well as others outside your home throughout the full 10 days after your last close contact with someone with COVID-19.
• If you are unable to quarantine, you should wear a well-fitting mask for 10 days when around others at home and in public.
• If you are unable to wear a mask when around others, you should continue to quarantine for 10 days. Avoid people who have weakened immune systems or are more likely to get very sick from COVID-19, and nursing homes and other high-risk settings, until after at least 10 days.
• Do not travel during your 5-day quarantine period. Get tested at least 5 days after your last close contact and make sure your test result is negative and you remain without symptoms before traveling. If you don’t get tested, delay travel until 10 days after your last close contact with a person with COVID-19. If you must travel before the 10 days are completed, wear a well-fitting mask when you are around others for the entire duration of travel during the 10 days. If you are unable to wear a mask, you should not travel during the 10 days.
• Do not go to places where you are unable to wear a mask, such as restaurants and some gyms, and avoid eating around others at home and at work until after 10 days after your last close contact with someone with COVID-19.

Those who are close contacts of someone with COVID but are up-to-date on their vaccinations or have had a confirmed case of COVID-19 within the last 90 days do not need to quarantine, but the CDC does recommend they wear a well-fitting mask around others for 10 days after their most recent exposure and get tested after at least five days.

Isolation

According to the CDC, people who are positive for COVID should stay home until it's safe for them to be around others, including even other members of their home.

Health officials recommend a "sick room" or area for those who are infected and a separate bathroom, if possible.

But isolation may not just be for those who test positive. The CDC also recommends those who have symptoms of COVID-19 and are awaiting test results or have not yet been tested isolate, "even if they do not know if they have been in close contact with someone with COVID-19."

How do you end isolation?

• You can end isolation after five full days if you are fever-free for 24 hours without the use of fever-reducing medication and your other symptoms have improved (Loss of taste and smell may persist for weeks or months after recovery and need not delay the end of isolation​).
• If you continue to have fever or your other symptoms have not improved after 5 days of isolation, you should wait to end your isolation until you are fever-free for 24 hours without the use of fever-reducing medication and your other symptoms have improved. Continue to wear a well-fitting mask through day 10. Contact your healthcare provider if you have questions.
• Do not go to places where you are unable to wear a mask, such as restaurants and some gyms, and avoid eating around others at home and at work until a full 10 days after your first day of symptoms.

So how do you calculate your isolation period?

According to the CDC, "day 0 is your first day of symptoms." That means that Day 1 is the first full day after your symptoms developed.

For those who test positive for COVID but have no symptoms, day 0 is the day of the positive test. Those who develop symptoms after testing positive must start their calculations over, however, with day 0 then becoming the first day of symptoms.

Under the CDC guidance, those in isolation should:

• Monitor your symptoms. If you have an emergency warning sign (including trouble breathing), seek emergency medical care immediately.
• Stay in a separate room from other household members, if possible.
• Use a separate bathroom, if possible.
• Take steps to improve ventilation at home, if possible.
• Avoid contact with other members of the household and pets.
• Don’t share personal household items, like cups, towels, and utensils.
• Wear a well-fitting mask when you need to be around other people.

Do you need to test out of isolation?

While testing out of isolation is not required, the CDC says those who choose to should use an antigen test and not a PCR test. These can be taken toward the end of the isolation period.

"Collect the test sample only if you are fever-free for 24 hours without the use of fever-reducing medication and your other symptoms have improved," the CDC states. "If your test result is positive, you should continue to isolate until day 10. If your test result is negative, you can end isolation, but continue to wear a well-fitting mask around others at home and in public until day 10."

What should you do after quarantine or isolation?

After quarantining for the appropriate amount of time, those who were exposed should continue to watch for symptoms until at least 10 days after their exposure. If symptoms develop, they should isolate immediately and get tested.

After ending isolation, the CDC recommends individuals continue wearing a mask through day 10, or continue isolating for a full 10 days if masking isn't an option. They also urged these individual to avoid anyone with a weakened immune system or those at higher risk of infection for the full 10 days.

When Should You Call a Doctor?

The CDC urges those who have or may have COVID-19 to watch for emergency warning signs and seek medical care immediately if they experience symptoms including:

• Trouble breathing
• Persistent pain or pressure in the chest
• New confusion
• Inability to wake or stay awake
• Pale, gray, or blue-colored skin, lips, or nail beds, depending on skin tone

"This list is not all possible symptoms," the CDC states. "Please call your medical provider for any other symptoms that are severe or concerning to you."

You can also notify the operator that you believe you or someone you are caring for has COVID.