He practiced surgery at a private clinic in Halberstädt, and from 1910 worked in Berlin. He is known for the development of operative procedures for the treatment of gall bladder and bile duct diseases.
His name is lent to Kehr's sign, which is in an indication of acute pain in the left shoulder associated with a ruptured spleen. Also, he popularized a device for biliary drainage that today is known as "Kehr's T-tube".
- Die chirurgische Behandlung der Gallensteinkrankheit, 1896
- Die in meiner Klinik geübte Technik der Gallensteinoperationen, 1905
- Die Praxis der Gallenwege-Chirurgie in Wort und Bild, 2 volumes- 1913: (life works of Kehr)
- Chirurgie der Gallenwege, 1913
- Parts of this article are based on a translation of the equivalent article from the German Wikipedia.
- Journal of Surgery Coledocolitiasis: Evolution of the diagnosis and treatment
-  Hans Kehr; not first, but foremost
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