Reece E A, Chervenak F A, Moya F R, Hobbins J C
Obstet Gynecol. 1984 Aug;64(2):248-50.
The effects of blood and meconium at various dilutions and pH alterations on the fern test were evaluated in an in vitro study. Thirty-six specimens of amniotic fluid across gestational ages (16 to 42 weeks) were tested. The fern test was unaffected by meconium at any concentration and by blood at dilutions of 1:10 or greater. When blood and amniotic fluid were mixed in equal amounts, ferning was not present. Arborization of amniotic fluid was unaffected by pH alterations. These findings support the clinical usefulness of the fern test for the determination of ruptured membranes, even in the presence of blood or meconium contamination, and of pH alterations.
在一项体外研究中，评估了不同稀释度和pH改变的血液及胎粪对羊齿状结晶试验的影响。对36份不同孕周（16至42周）的羊水标本进行了检测。羊齿状结晶试验不受任何浓度的胎粪以及1:10或更高稀释度血液的影响。当血液与羊水等量混合时，无羊齿状结晶形成。羊水的树枝状结晶不受pH改变的影响。这些发现支持了羊齿状结晶试验在确定胎膜破裂方面的临床实用性，即使存在血液或胎粪污染以及pH改变的情况。
