This reduces the confounding factors of disturbance and restriction.But care must be taken that the method of euthanasia does not induce a catecholamine response itself.

• 這種測量法可以避開採樣時因干擾與限制動物而影響數據的顧慮，但要注意安樂死時勿造成動物因緊迫而釋放出鄰苯二酚胺。