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The 56 US states and territories we track report their total test results in three main ways: by specimens tested, by people tested, and by “test encounters,” a unit which usually counts unique people tested per day.

In the early months of the pandemic, many of the jurisdictions we track reported positive and negative tests, but not total tests. To arrive at a total tests number for each jurisdiction, we added together the positive and negative numbers from states and territories. (This method usually produced a total tests number reported in people.) COVID-19 data reporting has significantly improved since the spring of 2020, and this method is no longer required.

As we make the transition from using computed total test numbers to direct reporting of the total test numbers states publish, we are publishing total test numbers in all available units for each state and territory on our website, and in separate fields in our API. Where we must choose a unit for total tests reporting, we are prioritizing units of test encounters and specimens above people—a change which we believe will provide the most useful measure of each jurisdiction’s testing capacity. For more information on how and why we are changing our reporting methods, please see “Counting COVID-19 Tests: How States Do It, How We Do It, and What’s Changing.”

This page will serve as a central reference where our API and website users can easily see which states are reporting total tests in each unit and how this information is reflected on our site and in the API.

Total tests on our website

On our website, we report all the total tests metrics that each state or territory provides, so many states will have two “total tests” numbers, each labeled by the unit in which they’re reported.

In the “New tests” chart on each state page, we require at least 150 days of historical data to visualize in the chart. For states that offer multiple total tests metrics with 150 days of historical data, we use, in order of most to least preferred, tests reported in testing encounters, tests reported in specimens, or tests reported in people. Otherwise, we default to “total test results,” which sums the state’s positive and negative figures.

The total tests metric we visualize in each state’s chart is labeled on the chart itself, and also listed below.

StateTotal test results field"New Tests" chart field"New Tests" chart units
StateAlabamaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsUnclear units
StateAlaskaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateAmerican SamoaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateArizonaTotal test results fieldTotal PCR Tests (People)"New Tests" chart fieldTotal PCR tests (people)"New Tests" chart unitsPeople
StateArkansasTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateCaliforniaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateColoradoTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateConnecticutTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateDelawareTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateDistrict of ColumbiaTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateFloridaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateGeorgiaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateGuamTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsUnclear Units
StateHawaiiTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateIdahoTotal test results fieldTotal PCR Tests (People)"New Tests" chart fieldTotal PCR tests (people)"New Tests" chart unitsPeople
StateIllinoisTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateIndianaTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateIowaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateKansasTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateKentuckyTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateLouisianaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateMaineTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateMarylandTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateMassachusettsTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateMichiganTotal test results fieldPositive + Negative"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateMinnesotaTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateMississippiTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateMissouriTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateMontanaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateNebraskaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal PCR tests (people)"New Tests" chart unitsPeople
StateNevadaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateNew HampshireTotal test results fieldTotal Tests (PCR)"New Tests" chart fieldTotal PCR tests (specimens)"New Tests" chart unitsSpecimens
StateNew JerseyTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateNew MexicoTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateNew YorkTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsEncounters
StateNorth CarolinaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateNorth DakotaTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateNorthern Mariana IslandsTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateOhioTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsUnclear units
StateOklahomaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateOregonTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StatePennsylvaniaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal PCR tests (people)"New Tests" chart unitsPeople
StatePuerto RicoTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateRhode IslandTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateSouth CarolinaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateSouth DakotaTotal test results fieldTotal PCR Tests (People)"New Tests" chart fieldTotal PCR tests (people)"New Tests" chart unitsPeople
StateTennesseeTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateTexasTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateUS Virgin IslandsTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsUnclear units
StateUtahTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateVermontTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateVirginiaTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateWashingtonTotal test results fieldTotal Test Encounters (PCR)"New Tests" chart fieldTotal PCR tests (test encounters)"New Tests" chart unitsEncounters
StateWest VirginiaTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsSpecimens
StateWisconsinTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople
StateWyomingTotal test results fieldPositive + Negative"New Tests" chart fieldTotal test results"New Tests" chart unitsPeople

API changes

In our API, we offer multiple total test fields, which you can learn about on our Data Definitions page. These include three fields with different units (specimens, people, and encounters) that draw direct totals figures from states whenever they are available, and our original total tests field, which is still calculated for most jurisdictions by adding together that jurisdiction’s positive and negative results (totalTestResults).

We are gradually switching our totalTestResults field to draw totals directly from the test encounters, specimens, and people field, in that priority order. We only switch to non-calculated, directly reported total tests for a state or territory when that state or territory has provided a time-series stretching back to March and a matching positive unit. So far, we have switched Alabama, Alaska, Arizona, Arkansas, California, Colorado, the District of Columbia, Georgia, Hawaii, Idaho, Indiana, Kentucky, Maryland, Massachusetts, Minnesota, Missouri, New Hampshire, North Dakota, Rhode Island, South Dakota, Virginia, and Washington. Since September 17, 2020, these changes have been reflected in the national totalTestResults field.