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六個方法準確計算預產期

出處：媽媽育兒網 日期：2010-01-24 17:21:01 編輯：admin

如何準確的計算預產期呢？以下有六個方法幫助媽媽準確的計算預產期。

(1) 根據末次月經計算：

末次月經日期的月份加9或減3，為預產期月份數(shù);天數(shù)加7，為預產期日。舉例：最后一次月經是1985年2月1日，日期 1+7，月份2+9，預產期=11月8日(85年)末次月經是1985年4月15日，日期15+7，月份4-3，預產期=1月22日(86年)

(2) 根據胎動日期計算：

如你記不清末次月經日期，可以依據胎動日期來進行推算。一般胎動開始于懷孕后的18-20周。計算方法為：初產婦是胎動日加20周;經產婦是胎動日加22周。

(3) 根據基礎體溫曲線計算：

將基礎體溫曲線的低溫段的最后一天作為排卵日，從排卵日向后推算264-268天，或加38周。

(4) 根據B超檢查推算：

醫(yī)生做B超時測得胎頭雙頂間徑、頭臀長度及股骨長度即可估算出胎齡，并推算出預產期(此方法大多作為醫(yī)生B超檢查診斷應用)。

(5) 從孕吐開始的時間推算：

反應孕吐一般出現(xiàn)在懷孕6周末，就是末次月經后42天，由此向后推算至280天即為預產期。

(6) 根據子宮底高度大致估計

如果末次月經日期記不清，可以按子宮底高度大致估計預產期。妊娠四月末，子宮高度在肚臍與恥骨上緣當中(恥骨聯(lián)合上10厘米);妊娠五月末，子宮底在臍下2橫指(恥骨上16-17厘米);妊娠六月末，子宮底平肚臍(恥骨上19-20厘米);妊娠七月末，子宮底在臍上三橫指(恥骨上22-23厘米);妊娠八個月末，子宮底的劍突與臍的正中(恥上24-25厘米);妊娠九月末，子宮底在劍突下2橫指(恥骨上28-30厘米);妊娠十個月末，子宮底高度又恢復到八個月時的高度，但腹圍比八個月時大。

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