能看到胎心后流产的概率就会降低

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查到一点英文的资料，大概翻译一下，

看到胎心后的流产概率会降低，下面是一些参考数值：

如果没有出血，4 ％。

如果有出血，13 ％。

如果有习惯性流产，17 ％。

36岁以上，16 ％。

40岁以上，20 ％。

原文如下：

Question: What Are the Odds of Miscarriage After Seeing a Fetal Heartbeat on an Ultrasound

Seeing the baby's heartbeat on an ultrasound is a good sign and does put a pregnancy into a lower risk category for miscarriage.

Answer:

Doctors generally agree that the risk of miscarriage decreases once the pregnancy reaches a point that an ultrasound can detect a heartbeat. The exact amount that it decreases, however, seems to vary by group.

It's hard to say any exact numbers from the available research, but here are some statistics that certain studies have come up with.

For women with no vaginal bleeding, most estimates suggest that the odds or having a miscarriage after seeing a heartbeat are about 4%.

For women with vaginal bleeding but also a detected heartbeat on ultrasound, risk of miscarriage is about 13% according to one study.

One study found that about 17% of women with a history of recurrent miscarriages will miscarry after seeing a heartbeat on the ultrasound.

Mothers over 35 also face significant miscarriage risk after ultrasound detects a heartbeat, even though the risk does drop after detecting the heartbeat. A 1996 study found that women over 36 have a 16% risk of miscarriage at this point, and women over 40 have a 20% risk.

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