among 10 patients with hereditary medullary thyroid carcinoma without any clinical symptoms and signs for pheochromocytoma , 6 patients had increased epinephrine and e/n ratio and normal norepinephrine , and the remaining 4 had normal epinephrine , norepinephrine and e/n ratio in 24 hour urine .
C0028351
norepinephrine
C0014563
e/n