The aim of this study was to investigate alterations in the leukocyte and differential leukocyte counts in different trimesters of pregnancy and the initial postpartum period. The study population consisted of 40,325 pregnant women. A full blood count and automated differential leukocyte count were performed and all the haemogram results in the different trimesters of pregnancy were recorded. Percentiles were calculated using statistical software. A total of 82,786 complete blood count evaluations were performed in 40,325 subjects from the 6th to 41st week of pregnancy and in the initial postpartum period. The leukocyte counts increased from the 1st to the 3rd trimester and peaked in the initial postpartum period. Our reference values for the total and differential leukocyte counts may assist clinicians in distinguishing between leukocytosis and pathological elevation of the white blood cell count during pregnancy and the initial postpartum period. Impact statement Pregnancy requires profound adaptation by multiple systems to accommodate the demands of the developing foetus. Similar to all other systems, many haematological changes occur during pregnancy. Studies of normal variation in leukocyte counts were insufficient to distinguish normal from abnormal leukocyte counts during pregnancy and in the initial postpartum period, due to small numbers of patients and a lack of differential leukocyte counts. Without reference leukocyte levels, infections may be more difficult to assess during pregnancy and in the postpartum period. In this study, we report the 3rd, 5th, 10th, 50th, 95th and 99th percentile values for the total and differential leukocyte counts according to trimester in normal pregnancy and the initial postpartum period. Our reference values for the total and differential leukocyte counts in each trimester and the initial postpartum period may assist clinicians in distinguishing between normal leukocytosis and pathological elevation of the white blood cell count during pregnancy and the initial postpartum period. Our results may prevent misdiagnosis of physiological elevated leukocytes as bacterial infection that leads to unnecessary medication use that may compromise the foetus.

译文

这项研究的目的是调查妊娠不同三个月和产后初期白细胞和白细胞计数差异的变化。研究人群由40,325名孕妇组成。进行了全血细胞计数和自动差异白细胞计数,并记录了妊娠不同三个月的所有血象结果。使用统计软件计算百分位数。从怀孕的第6周至第41周和产后初期,对40,325名受试者进行了总共82,786次全血细胞计数评估。白细胞计数从第1个月到第3个月增加,并在产后初期达到峰值。我们的总白细胞计数和差异白细胞计数参考值可以帮助临床医生区分白细胞增多和妊娠和产后初期白细胞计数的病理升高。影响声明怀孕需要多个系统进行深刻的适应,以适应发育中的胎儿的需求。与所有其他系统相似,许多血液学变化发生在怀孕期间。由于患者人数少且缺乏差异的白细胞计数,对白细胞计数正常变化的研究不足以区分妊娠期间和产后初期的正常白细胞计数与异常白细胞计数。如果没有参考白细胞水平,则在怀孕期间和产后期间可能更难评估感染。在这项研究中,我们根据正常妊娠和产后初期的三个月报告了总白细胞计数和差异白细胞计数的第3、5、10、50、95和99个百分位数值。我们在每个孕期和产后初期的总白细胞计数和差异白细胞计数的参考值可以帮助临床医生区分正常的白细胞增多和妊娠和产后初期的白细胞计数的病理升高。我们的结果可以防止将生理性白细胞升高误诊为细菌感染,从而导致不必要的药物使用,从而可能损害胎儿。

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