To assess the effect of gestational age-based dosing of unfractionated heparin (UFH) compared with standard dosing of UFH for thromboprophylaxis on an elevated serum activated partial thromboplastin time (aPTT) during prolonged antepartum hospitalizations.

中文翻译：

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产前住院中预防性普通肝素：一项随机对照试验。

旨在评估基于胎龄的普通肝素 (UFH) 剂量与预防血栓的标准剂量 UFH 相比，对产前长时间住院期间血清活化部分凝血活酶时间 (aPTT) 升高的影响。