Hypoxia preconditioned plasma
Hypoxia preconditioned plasma or hypoxia pre-conditioned plasma (abbreviated as HPP) is the (cell-free) plasma obtained after extracorporeal conditioning (i.e. culturing) of anticoagulated blood under physiological temperature (37 °C) and physiological hypoxia (1–5 %O2).
Source: Wikipedia — Hypoxia preconditioned plasma (CC BY-SA 4.0)