FDA approves new COVID-19 test that could help 'long haulers'

The T-Detect COVID-19 test is developed by Seattle-based Adaptive Biotechnologies Corp. in collaboration with Microsoft

The Food and Drug Administration has issued an emergency use authorization for a new coronavirus testing method using the body’s T-cells — which could help better diagnose COVID long-haulers.

The T-Detect COVID-19 test — developed by Seattle-based Adaptive Biotechnologies Corp. in collaboration with Microsoft — is billed as a "next generation" screening method that analyzes DNA from T-cells in blood samples instead of current testing methods that screen for immune proteins.

"The T-Detect COVID test will be a useful tool to help determine if a person previously had COVID-19," the FDA announced Friday. "This is especially important for people who may have exhibited symptoms previously or believe they have been exposed but have not tested positive."

The company’s chief medical officer told Bloomberg prior to the FDA’s approval that the $150 test may help people who think they’ve been infected but haven’t been diagnosed — especially so-called "long haulers" who have had symptoms persist for weeks or months.

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"Some of these people were never diagnosed," Adaptive’s Lance Baldo told Bloomberg in January. "Sometimes their physicians are wondering, and – frankly, this is where it gets ugly – sometimes their insurers are wondering."

The blood test extracts DNA from T-cells and then uses machine-learning software developed in a partnership Microsoft to determine if the person has been previously infected with the virus.

"We’re looking for that imprint, like a crime scene investigation," Dr. William Li, a T-Detect prescribing physician, explained to ABC News Tuesday.

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"So many people had the disease, recovered, never got a clear-cut diagnosis, yet they’re suffering from these bizarre, persisting symptoms. The T-cell test has been really useful in this long tail of COVID to help patients establish where they are."

Baldo told ABC News that T-cells work as the immune system’s front-line "foot soldiers."

How long their response stays in the body remains unclear, but UK research suggests up to six months — potentially longer than antibodies, Bloomberg reported.

This article originally appeared on the NYPost.com.