Norepinephrine and epinephrine are short-lived hormones that are difficult to measure clinically, with only their metabolites detectable in urine.

“certainly norepinephrine epinephrine they stick around for such a short period of time I mean we don't even measure these things clinically I can't poke your arm and measure your norepinephrine or epinephrine level the best I can do is collect its metabolites in your urine for evidence that it's been around”