A new study published in The Lancet Neurology demonstrates the ability of two blood-based biomarkers to predict how someone will recover from traumatic brain injury (TBI). Testing for these two biomarkers in the immediate aftermath of an injury can help healthcare providers determine the best way to treat and care for patients.
This research shows that when a clinician conducts a blood test for these brain proteins soon after a possible injury, they quickly get a more accurate picture of how severe the injury is, the expected course of recovery and the longer-term implications of the TBI. The markers were measured using Abbott's i-STAT TBI Plasma test, as well as on the company's ARCHITECT core laboratory instrument using research prototype assays, both of which helped predict recovery.
Researchers measured levels of Glial Fibrillary Acidic Protein (GFAP) and Ubiquitin carboxy-terminal Hydrolase L1 (UCH-L1) present in blood plasma within 24 hours of injury. After testing biomarker levels on the day of injury, researchers evaluated patients six months later, tracking how individuals fared and how biomarker levels corresponded to their recovery.
In the study, researchers examined the day-of-injury blood tests of 1,696 patients with TBI and compared those to patients' six-month assessment, using the Glasgow Outcome Scale Extended, which grades outcomes and quantifies levels of disability following TBI. The researchers found that high values of the biomarkers, GFAP and UCH-L1, correlate with death and severe injury. The day-of-injury blood tests had a high probability of predicting death at six months, 87% for GFAP and 89% for UCH-L1; and a high probability of predicting severe disability at the same timepoint, 86% for both GFAP and UCH-L1.
GFAP and UCH-L1 are proteins found in glial cells and neurons and are released into the blood stream after the brain is injured. They can be measured with diagnostic testing. Abbott's i-STAT TBI Plasma test is the first rapid test on a portable analyzer to receive FDA 510(k) clearance and can help determine the need for a computed tomography (CT) scan. Test results are available approximately 15 minutes after a plasma sample is inserted in the test i-STAT cartridge.