医学
胎盘生长因子
胎龄
奇偶性(物理)
方差分析
妊娠期
怀孕
重复措施设计
男科
多元分析
子痫前期
内科学
生物
数学
统计
物理
粒子物理学
遗传学
作者
Lai Wa Law,Daljit Singh Sahota,Lin Wai Chan,Min Chen,Tze Kin Lau,Tak Yeung Leung
标识
DOI:10.3109/14767051003678242
摘要
Objective. To assess the effect of storage time on the stability of placental growth factor (PlGF) and fms-like tyrosine kinase 1 (sFlt-1) levels in frozen serum samples from pregnant women.Methods. This is a matched case–control study using fresh and stored serum samples collected at 6, 12, 18, 24, 30 and 36 months prior to the collection of the fresh samples and frozen at –80°C. Forty-eight samples from each of the seven time-groups were matched for non-smoking Chinese, maternal weight, singleton-term pregnancy without major obstetric complications and extracted for PlGF and sFlt-1 assays. Multivariate analysis was performed to assess residual effects of the case-matching procedure. ANOVA was used to assess the effects of storage time.Results. Multivariate analysis of the 336 samples indicated that log10PlGF was positively correlated with parity (p = 0.014) and gestational age (p = 0.029), while log10sFlt-1 was inversely correlated with parity (p = 0.018). After correcting for the residual effect of gestation and parity, ANOVA showed no significant difference in PlGF and sFlt-1 levels between the fresh samples and all stored samples (p = 0.410 and p = 0.158, respectively).Conclusions. Serum PlGF and sFlt-1 levels are stable for at least 3 years when stored at –80°C. Parity is an independent factor of PlGF and sFlt-1 levels. PlGF levels are lower and sFlt-1 levels are higher in nulliparous women compared to multiparous.
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