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如何計算預產期？自然分娩解析與預產期推測

出處：媽媽育兒網 日期：2012-04-28 12:13:47 編輯：Chen

自然分娩是指在有安全保障的前提下，通常不加以人工干預手段，讓胎兒經陰道娩出的分娩方式。自然陰道分娩是最理想、對母嬰最安全的分娩方式。與剖宮產相比,有其優(yōu)越性，如快捷、簡單，為搶救生命贏得了時間，而且合并癥少，產后恢復快。

自然分娩最基本的條件是決定分娩的三因素：產力、產道及胎兒均正常且三者相適應。孕婦在決定自然分娩時，應先了解何時預產及生產的全過程。

預產期的推測

推測預產期是孕婦為分娩所做的準備工作中必不可少的一個環(huán)節(jié)。預產期的推測是末次月經第1天起，月份減3或加9，日數(shù)加7，例如末次月經第1天為2000年3月31日，則預產期為2001年1月7日。如果推算時按陰歷，則月份減3或加9，而日數(shù)則加15，如末次月經第1天為2000年8月10日，則預產期為2001年5月25日。

而實際分娩的日期受多種因素的影響，可以與預產期相差1～2周這屬于正常情況。對于不清楚末次月經的孕婦或者哺乳期無月經來潮而懷孕者，可以根據(jù)早孕反應開始出現(xiàn)的時間，胎動開始時間，手測子宮高度或尺測恥上子宮長度估計。

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