Nasogastric intubation technique for bile sampling in the baboon (Papio ursinus)

A duodenal tube was introduced into the duodenum of the fasted baboon via the nasal passage. After the application of vacuum for several minutes, the baboon received an intravenous injection of pancreozymin and cholecystokinin which caused contraction of the gall bladder. Aspiration of the bile sample was carried out via the duodenal tube.