Blood Tests Spot Rugby Concussions Faster

Rugby concussions are climbing, and the current Head Injury Assessment relies heavily on what players say they feel. Researchers wanted a way to check the injury with blood tests instead of just asking questions.

The team followed 68 elite players from September 2022 to June 2024. When a concussion was suspected, they took blood samples right after the match according to the HIA rules. In the control group, S100B stayed the same all season, while GFAP and UCH‑L1 were below the test’s detection limit.

Two hours after a game without a concussion, both S100B and UCH‑L1 jumped, linking the rise to how often players hit each other, but GFAP stayed flat. By the 36‑hour mark, all three markers returned to normal, showing that 36 hours works as a reliable check point. After a confirmed concussion, UCH‑L1 stayed under the measurable range, meaning an earlier draw might catch its change. When S100B rose at least 15% from its starting level, the test was 100% accurate at ruling out injury but only 39% good at spotting it. GFAP above 30 ng/L was always a true negative, yet it missed most real injuries, with 17% sensitivity. Mixing S100B and GFAP kept the 100% rule‑out rate and lifted detection to 52%.

Putting these blood markers into the regular assessment could give doctors a clear, objective picture and make player safety stronger. The study shows that timing matters and that combining tests improves the chance of catching a real concussion.