urine norepinephrine excretion rate calculated urine catecholamine excretion rate absolute change in urine norepinephrine excretion rate 2014-08-26T12:23:42Z CHEBI:33569 CMO:0002574 JSmith The calculated difference in urine norepinephrine excretion rate between two points in time or two conditions expressed as the result of the subtraction in and of itself without comparison by ratio with another quantity. The term "absolute change" refers to the subtraction of one value from another, as opposed to a dissimilarity of two values expressed as a ratio or as a percentage. In this context it is not intended to necessarily imply the difference expressed as an absolute value |n|, that is, the numeric value of the difference without regard to its sign. absolute change in urine noradrenaline excretion rate clinical_measurement_ontology