The production of nitric oxide(NO) was determined by nitrate reductase method.
用硝酸还原酶法测一氧化氮（NO）的浓度。
Methods: Plasma et levels were determined by using a radioimmunoassay kit, serum no levels were determined by using a nitrate reductase method in 20 newborn with HIE and 20 normal newborn.
方法：采用放射免疫分析法和硝酸还原酶法测定20例HIE新生儿和20例正常新生儿血浆et与血清NO水平。
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