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A member asked:
What could cause/explain significantly elevated (4.5x the norm range)plasma norepinephrine in blood test, but normal urinary norepinephrine levels?
A doctor has provided 1 answer
Normal variation: Plasma levels vary with rate of production and rate of excretion. Hormone levels vary a great deal in production by stress and by time of day and by medication effects. Rate of excretion depends on liver metabolism and clearance by the kidney. Kidney clearance may be normal but will eventually clear the hormone over time. High serum level means high production by some uncertain cause.
Answered 12/15/2012
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