RF Safe argues that red blood cell (RBC) “rouleaux” (stacking/aggregation) could be a visible, testable endpoint for investigating potential short-term physiological effects from wireless device exposure. The post highlights a 2025 report by Brown & Biebrich describing ultrasound observations interpreted as rouleaux-like aggregation after 5 minutes of smartphone placement near the popliteal vein, and contrasts this with earlier, more-criticized “live blood analysis” videos. It frames rouleaux as an electrostatic/zeta-potential phenomenon and calls for mechanistic testing and exposure mitigation, while presenting the ultrasound observation as a key shift toward more clinically standard imaging.