[A simplified method for the fluorometric determination of 5-hydroxy-indoleacetic acid in the human liquor cerebrospinalis (author's transl)].

The fluorometric analysis of 5-hydroxy-indoleacetic acid by condensation with o-phthaldialdehyde has been modified by substituting a HCl-H2SO4 mixture at room temperature for hot concentrated HCl. The sensitivity of the method was increased by a factor of 2.7.