Luteal Phase Length & Pregnancy: What's the Ideal Duration?

Question
QUESTION:  Hello,
     I was wondering how long a luteal phase has to be to support pregnancy. I have heard 10, 12, and 14 days. Which one is accurate? Thanks

ANSWER: Dear Megan

The ideal would 14.

Thank you

---------- FOLLOW-UP ----------

QUESTION:  Ok, Thank you for your timely answer. I know that normally the luteal phase is 14 days. However, what is the shortest amount of time a luteal phase can be to support pregnancy?

Answer
Dear Megan

The durattion of the luteal phase of the cycle should be 14 in all normal women looking for a pregnancy. This means that, in a woman with a cycle lenth of 28 days, the luteal pahse is 14 and proliferative is 14. A woman with a cycle length of 24 has a luteal phase of 14 and proliferative of 10...etc. It always comes on the expense of the proliferative phase.

A luteal phase less than 14 days is associated with miscarriages. In some cases with less than 14 days luteal, pregnancy continues with a hormonal support by natural progesterone or human chorionic gonadotrophins.

I hope that these information are helpful.