[Determination of the monoamine oxidase and the diamine oxidase activity of a single blood sample].

The known methods for simultaneous measurements of blood histamine and serotonin have prompted the authors to search for approaches to simultaneous measurements of monoamine oxidase and diamine oxidase, the enzymes contributing to serotonin and histamine inactivation. The authors suggest a method for simultaneous measurements of the blood serum monoamine oxidase and diamine oxidase activities that permits cut down the time of the blood and substrate incubation to 10 min, essentially shortens the procedure and simplifies it. The method is recommended for research and practice.