探索足月胎儿临产时的羊水乳酸水平的正常值范围，寻找羊水乳酸水平与胎儿、孕母乳酸的关系，观察其对胎儿窘迫的预测价值。
Objective: To investigate the normal value of amniotic fluid(AF) lactate of term fetus at labor and the correlations among AF lactate, fetal plasma lactate and maternal plasma lactate.
本周的结束意味着胎宝宝已是足月儿，也意味着在接下来的两周左右，随时都有可能临产。
The ending of this week imply that my fetus has being a term infant, it also means my baby may be born in any day around the next two weeks.
而临产妇女较足月妊娠待产妇女明显降低（P<0.01），产后妇女明显低于妊娠不同时期（P<0.01）。
The serum nitric oxide level in term labor was significantly lower than that in late-trimester(P<0.01), and was significantly lower in postpartum than that in all the periods of pregnancy(P<0.01).
而临产妇女较足月妊娠待产妇女明显降低（P<0.01），产后妇女明显低于妊娠不同时期（P<0.01）。
The serum nitric oxide level in term labor was significantly lower than that in late-trimester(P<0.01), and was significantly lower in postpartum than that in all the periods of pregnancy(P<0.01).
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