Porges-Meier reaction

Porges-Meier reaction is a precipitation test used in the diagnosis of syphilis.

It is an early flocculation test for syphilis.

Precipitate formation takes place in a serum by the addition of a solution of sodium glycocholate. This reaction, according to Otto Porges, only occur in syphilis.

Reference:

http://ajp.psychiatryonline.org/cgi/content/abstract/65/4/653

...
Wikipedia