A field evaluation of formalin-gasoline technique in the concentration of stool for detection of intestinal parasites.

A field evaluation of the formalin-gasoline procedure to detect parasite ova, cysts, or larvae from 470 fecal specimens (comprising both fresh and formalin-preserved stool samples) was compared with that of the formalin-ether sedimentation technique. Parallel concentrates with diethyl ether and gasoline were prepared for each specimen, and the species and appearance of recovered parasite species were determined. Of 470 total specimens, 206 (43.