Abstract
Abstract Forty-four healthy young adult male subjects were given oral doses of urea and parotid fluid and serum urea levels were studied for 1–3 hr. A highly significant correlation between urea in serum and in parotid fluid ( r = 0.982) was found. The indication was that, with flow rate carefully controlled, parotid fluid could be used interchangeably with serum in urea determinations, regardless of the magnitude of the blood concentration.
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