automated serum urea analysis automated blood urea nitrogen analysis automated serum urea nitrogen analysis 2022-04-07T15:08:36Z MMO:0000839 This is a method using a device designed to follow a predetermined sequence of individual operations repeatedly and essentially without external influence or control to measure the amount of nitrogen present in serum, the clear liquid that separates from blood after it has clotted completely. Urea is the chief nitrogenous end product of protein metabolism and is formed in the liver from amino acids and from ammonia compounds and is found in urine, blood, and lymph. measurement_method_ontology slaulede