Blood Clotting (血の凝固 Chi no Gyōko) allows Ranma to solidify his own blood at a certain portion of his own body. This solidification allows him to protect himself from particularly strong attacks with much greater ease, allowing for an enhanced level of durability that wouldn't be possible for normal humans. Blood Clotting is represented by a faint pattern tracing the veins beneath the surface of the skin, which is only visible on the afflicted area when struck. It is shown that through this level of durability, he is able to swat off even powerful physical attacks with the least amount of effort. However, despite the considerable defense afforded by this technique, it seemingly isn't absolute and can be torn using sufficient power.
In addition when the hardened blood is directed along a channeled stream Ranma gains inhuman attack power.