The Meals and Drug Administration issued an emergency authorization for the first over-the-counter, at-home mixture flu and Covid check on Friday, simply two days after the corporate that makes the check introduced that it had filed for chapter safety based mostly, partially, on the company’s prolonged approval timeline.

The one-use check works with a self-collected nasal swab and supplies a end in about half-hour, in response to the F.D.A. The check is supposed for use by individuals 14 and older, or by an grownup amassing a pattern from somebody age 2 or older.

The check’s developer, Lucira Well being, based mostly in California’s Bay Space, introduced its chapter plan on Wednesday, noting that it had anticipated its emergency-use authorization for the check in August earlier than the onslaught of the flu season. The corporate mentioned the company’s authorization course of “grew to become protracted,” and mentioned it had excessive expenditures because it moved ahead with manufacturing the mix assessments.

With out income that the corporate anticipated from projected gross sales of the assessments throughout this yr’s flu season, Lucira determined that it will pursue a sale of its enterprise however proceed operations to serve prospects, in response to its information launch. The chapter plan was reported earlier in The Wall Avenue Journal.

In a press release issued on Friday, Dr. Jeff Shuren, the director of the F.D.A.’s system division, known as the check “a significant milestone in bringing better shopper entry to diagnostic assessments that may be carried out totally at residence.”

However regardless that public well being specialists and scientists welcomed the check authorization, it remained unclear when such a mixed check can be extensively out there on the market to customers. And that uncertainty compounded issues that others have voiced in regards to the Biden administration’s plans to finish the coronavirus public well being emergency in Might, which might complicate entry to testing.

Folks with non-public insurance coverage and people on Medicare, who’ve been eligible for eight free at-home assessments per thirty days, might should pay out of pocket for the assessments as soon as the emergency ends.

Erik Engelson, Lucira’s chief government, mentioned in a press release Friday that the corporate was “very excited” in regards to the authorization. “I can’t thank our staff and companions sufficient for seeing this by way of, and naturally, for the F.D.A.’s recognition,” he mentioned.

Lucira Well being didn’t instantly reply to questions on its manufacturing capability or how a lot the check would price customers.

The mixture check accurately recognized 99 p.c of destructive and 90 p.c of optimistic flu A samples, in response to the F.D.A. It additionally detected 100% of the destructive and 88 p.c of the optimistic Covid samples. The company mentioned it anticipated the corporate to proceed to check on the flu B pressure, which was not prevalent this yr.

The product is a molecular check, which implies it detects and amplifies the genetic materials of the viruses, as a P.C.R. check does. These assessments are typically extra delicate than antigen assessments, and at-home molecular assessments have been dearer than fast antigen assessments.

The brand new check would be the first of a sequence of mixture diagnostics in several phases of growth that may scan for a number of illnesses directly, mentioned Dr. Wilbur Lam, a pediatric hematologist and bioengineer at Emory College who has helped federal officers with check growth and validation.

“Now we’re on this new period that’s actually fairly thrilling,” Dr. Lam mentioned. “It’s thrilling for a well being care supplier, it’s thrilling for the expertise builders, and I feel thrilling for the general public as a result of we’ve got this new check. And that is solely the start.”

By way of the pandemic, some public well being specialists have criticized the F.D.A. for being gradual to approve at-home Covid assessments and the federal authorities for failing to make the assessments extra extensively out there to Individuals at little or no price. Even as soon as at-home assessments have been accepted, fluctuating demand prompted producers to ramp down manufacturing, contributing to shortages of fast assessments when the virus got here surging again.

In the course of the first years of the pandemic, flu exercise was unusually low. However final fall, with most pandemic precautions gone, the flu re-emerged in alarming numbers so early within the flu season. During the last a number of months, Individuals have needed to cope with waves of a number of viruses, together with influenza, the coronavirus and respiratory syncytial virus, or R.S.V.