Georges Hayem

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Georges Hayem (November 25, 1841 - August 27, 1933) was a physician and hematologist who was a native of Paris. He studied medicine in Paris, and later became a professor of therapy and materia medica. From 1878 until 1911 he practiced medicine at the Hôpital Tenon, and afterwards was associated with the Hôpital St. Antoine.

Georges Hayem was a pioneer in the field of hematology, and is remembered for his work involving the formation of leukocytes and erythrocytes. In 1889 he performed the first accurate count of blood platelets, and in 1874 provided an early description of chronic interstitial hepatitis. He also developed a solution of mercury bichloride, sodium chloride and sodium sulfate for dilution of blood prior to counting erythrocytes with a hemocytometer.

With bacteriologist Georges-Fernand Widal (1862-1929), the eponymous "Hayem-Widal syndrome" is named, which is a historical term for acquired hemolytic anemia.