Space blood test: can you prick your finger in zero g?

This study tested whether healthy volunteers could collect their own blood drops using a simple finger-prick method during brief periods of weightlessness on a parabolic flight. The goal was to see if this technique works in space-like conditions for measuring caffeine levels. Thirty participants tried the self-sampling in microgravity, and researchers checked if the blood spots were usable. This research helps pave the way for future studies on how drugs work in space.