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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 tests fieldUnits
StateAlabamaTotal tests fieldTotal PCR tests (specimens)UnitsUnclear units
StateAlaskaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateAmerican SamoaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateArizonaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateArkansasTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateCaliforniaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateColoradoTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateConnecticutTotal tests fieldTotal test resultsUnitsSpecimens
StateDelawareTotal tests fieldTotal test resultsUnitsPeople
StateDistrict of ColumbiaTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateFloridaTotal tests fieldTotal test resultsUnitsPeople
StateGeorgiaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateGuamTotal tests fieldTotal test resultsUnitsUnclear Units
StateHawaiiTotal tests fieldTotal test resultsUnitsPeople
StateIdahoTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateIllinoisTotal tests fieldTotal test resultsUnitsSpecimens
StateIndianaTotal tests fieldTotal test resultsUnitsPeople
StateIowaTotal tests fieldTotal test resultsUnitsPeople
StateKansasTotal tests fieldTotal test resultsUnitsPeople
StateKentuckyTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateLouisianaTotal tests fieldTotal test resultsUnitsPeople
StateMaineTotal tests fieldTotal test resultsUnitsSpecimens
StateMarylandTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateMassachusettsTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateMichiganTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateMinnesotaTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateMississippiTotal tests fieldTotal test resultsUnitsSpecimens
StateMissouriTotal tests fieldTotal test resultsUnitsPeople
StateMontanaTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateNebraskaTotal tests fieldTotal PCR tests (people)UnitsPeople
StateNevadaTotal tests fieldTotal test resultsUnitsPeople
StateNew HampshireTotal tests fieldTotal PCR tests (specimens)UnitsSpecimens
StateNew JerseyTotal tests fieldTotal test resultsUnitsSpecimens
StateNew MexicoTotal tests fieldTotal test resultsUnitsPeople
StateNew YorkTotal tests fieldTotal test resultsUnitsEncounters
StateNorth CarolinaTotal tests fieldTotal test resultsUnitsSpecimens
StateNorth DakotaTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateNorthern Mariana IslandsTotal tests fieldTotal test resultsUnitsPeople
StateOhioTotal tests fieldTotal test resultsUnitsUnclear units
StateOklahomaTotal tests fieldTotal test resultsUnitsSpecimens
StateOregonTotal tests fieldTotal test resultsUnitsPeople
StatePennsylvaniaTotal tests fieldTotal PCR tests (people)UnitsPeople
StatePuerto RicoTotal tests fieldTotal test resultsUnitsSpecimens
StateRhode IslandTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateSouth CarolinaTotal tests fieldTotal test resultsUnitsSpecimens
StateSouth DakotaTotal tests fieldTotal PCR tests (people)UnitsPeople
StateTennesseeTotal tests fieldTotal test resultsUnitsSpecimens
StateTexasTotal tests fieldTotal test resultsUnitsSpecimens
StateUS Virgin IslandsTotal tests fieldTotal test resultsUnitsUnclear units
StateUtahTotal tests fieldTotal test resultsUnitsPeople
StateVermontTotal tests fieldTotal test resultsUnitsPeople
StateVirginiaTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateWashingtonTotal tests fieldTotal PCR tests (test encounters)UnitsEncounters
StateWest VirginiaTotal tests fieldTotal test resultsUnitsSpecimens
StateWisconsinTotal tests fieldTotal test resultsUnitsPeople
StateWyomingTotal tests fieldTotal test resultsUnitsPeople

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, Arkansas, California, Colorado, the District of Columbia, Georgia, Idaho, Kentucky, Massachusetts, Minnesota, 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.