Tā de liǎnsè cāngbái, kàn qǐlái xiàng shì shīxuè le.
His face was pale; he looked like he had lost blood.
Tips
usage
失血 is used in both medical and everyday contexts. 失血过多 (shīxuè guòduō, excessive blood loss) is a very common collocation. The character 血 is pronounced xuè in formal/written contexts and xiě in colloquial speech.