血脂化验需要空腹抽血
发布时间:2011-01-19
来源:
血脂化验要求抽空腹血,所谓空腹血是指禁食12~14小时后所抽的静脉血。抽血化验血脂的前一天晚上8点后禁食不禁水,于次日早上8点到10点抽血化验血脂。
影响血脂化验结果的因素较多,其中影响最大的因素是食物。进食后,特别是吃了丰盛食物后,食物中脂肪在小肠中进行消化与吸收,食物中脂肪经过小肠进入血液,特别是甘油三酯浓度明显增加,因此,用这种血液测得的各项结果,不能反映机体的真实情况。只有抽空腹血化验的血脂才能反映稳定的血脂水平,而不是波动的血脂水平。
另外,餐后血脂还受到进食种类和数量的影响,比如吃了大鱼大肉等油腻的食物后,甘油三酯明显升高;而吃了蔬菜为主的食物后,甘油三酯升高相对较小。因此,空腹抽血可以避免不同食物对血脂的影响。再者,目前血脂各项检验的参考范围,均是以空腹血所测得的数值为准,餐后抽血化验的血脂结果将无法与空腹血所测得的参考范围进行比较。
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