A noninvasive technique for monitoring blood urea in humans during hyperbaric exposure

A significant increase was found in parotid gland urea excretion in nine U.S. Navy divers during 8 d of air saturation hyperbaric exposure. The parotid urea levels correlated positively and reflected changes in blood concentrations. Considering the simplicity and ease of parotid sampling, it is suggested that this method be used for monitoring blood urea levels in humans during hyperbaric exposure.