The<unk>  is a presumptive blood<unk> , first described in 1903, in which the chemical indicator phenolphthalein is used to detect the possible presence of hemoglobin. It relies on the peroxidase-like activity of hemoglobin in blood to catalyze the oxidation of phenolphthalin (the colorless reduced form of phenolphthalein) into phenolphthalein, which is visible as a bright pink color. The<unk>  is a form of catalytic blood<unk> , one of the two main classes of forensic<unk> s commonly employed by crime labs in the chemical identification of blood. The other class of<unk> s used for this purpose are microcrystal<unk> s, such as the Teichmann crystal<unk>  and the Takayama crystal<unk> . Joseph Hoeing<unk>  The<unk>  was named after the American agricultural chemist, Joseph Hoeing<unk>  (1864–1916), who in 1901, invented and<unk> ed the crude blood<unk> , and the German physician and chemist, Erich<unk>  (1874–1927), who modified the<unk>  in 1903.
Kastle–Meyer test
Tinetti test
Modified Ashworth scale
Hawkins–Kennedy test
Parks–Bielschowsky three-step test
Hamilton–Norwood scale
ALS Functional Rating Scale - Revised
Goldberg test