By Ike Swetlitz

February 14, 2018

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The Food and Drug Administration gave a green light Wednesday for the first

time to a blood test that doctors can use to help rule out concussions.

The Brain Trauma Indicator, marketed by Banyan Biomarkers Inc., measures the

levels of two proteins - called UCH-L1 and GFAP - whose elevated presence

suggests a certain type of brain damage normally only visible on a CT scan.

The test takes three to four hours, and doctors could use it to determine

which patients need a CT scan to confirm the damage and which patients can

rest easy.