Jan Janský

Prof MUDr Jan Janský Czech pronunciation: ˈjan ˈjanskiː 3 April 1873, Prague – 8 September 1921, Černošice, near Prague was a Czech serologist, neurologist and psychiatrist He is credited with the first classification of blood into the four types A, B, AB, 0zero of the AB0 blood group system

Janský studied medicine at Charles University in Prague From 1899, he worked in the Psychiatric Clinic in Prague In 1914, he was named professor During World War I Janský served two years as a doctor at the front until a heart attack disabled him After the war he worked as a neuropsychiatrist in a military Hospital Vojenská nemocnice He had angina pectoralis and died of ischaemic heart disease

Janský was also a proponent of voluntary blood donations


  • 1 Classification
  • 2 Legacy
  • 3 References
  • 4 External links


Through his psychiatric research, Janský tried to find a correlation between mental diseases and blood diseases He found no such correlation existed and published a study, Hematologická studie u psychotiků 1907, Hematological study of psychotics, in which he classified blood into four groups I, II, III, IV At the time this discovery passed almost unnoticed In 1921 an American medical commission acknowledged Janský's classification over that of Karl Landsteiner, who classified blood into only three groups; and was for this blood types discovery awarded the Nobel Prize in Physiology or Medicine in 1930 Janský's classification remains in use today A similar classification was described by William Lorenzo Moss, except the I and IV of Moss were the opposite to that of Janský's, leading to confusion in blood transfusion until the use of A, B and O became standard


  • Frequent voluntary blood donors in the Czech Republic and Slovakia are awarded with Janský medal Janského plaketa
  • The Secret of Blood, a 1953 Czechoslovak film about his discovery


External linksedit

  • Biography in Czech

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