Hilger J S, Holzman I R, Brown D R
J Reprod Med. 1981 Jun;26(6):305-7.
We studied the effect of a delay in blood sampling on the measurement of placental blood gases, pH and calculated bicarbonate. Blood was sampled serially at 15-minute intervals during the hour following delivery from placentas and attached umbilical cords of unasphyxiated term neonates. Placentas and attached cords were stored at room temperature. When blood was sampled exclusively from the segment of the umbilical vein lying within the umbilical cord, there were no statistically significant changes during the time of study in pH, PCO2 or PoO2. When some or all of the serial samples were taken from vessels on the surface of the placenta, there was a statistically and biologically significant decrease in the pH and increase in the PCO2 values of the blood. Our results indicate that the validity of the measurements of umbilical venous blood gases and pH is not affected by up to an hour's delay in blood sampling.
我们研究了采血延迟对胎盘血气、pH值及计算得出的碳酸氢盐测量结果的影响。在足月未窒息新生儿分娩后的一小时内，每隔15分钟从胎盘及相连的脐带中连续采血。胎盘及相连的脐带在室温下保存。当仅从脐带内的脐静脉段采血时，在研究期间pH值、二氧化碳分压（PCO2）或氧分压（PO2）无统计学上的显著变化。当部分或所有系列样本采自胎盘表面的血管时，血液的pH值出现统计学及生物学上的显著下降，PCO2值升高。我们的结果表明，脐静脉血气和pH值测量的有效性在采血延迟长达一小时的情况下不受影响。
