I am interested to know how laboratories interpret 24 hour urine
catecholamines (particularly noradrenaline) in adults being investigated for
possible phaeochromocytoma.
To exclude phaeochromocytoma as a likely diagnosis, are any labs using a
'cut-off' level which is different from an 'upper limit of normal' derived
from data from a population of 'normal' healthy individuals? If so, what
cut-off level is appropriate?
Stuart Robertson
Biochemistry Department
Hull Royal Infirmary
Hull
HU3 2JZ
UK
(01482-607707)
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