Nishmat's Women’s Health and HalachaIn memory of Chaya Mirel bat R' Avraham

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Endometrial biopsy after failed IVF

28 October, 2015


After a failed IVF cycle, the doctor has recommended an endometrial biopsy (taking a small sample of the lining of the uterus). If this causes spotting, will I be in nidah (when my period isn't scheduled for another week)? Thanks.


We are sorry to hear of your failed IVF cycle.

Uterine bleeding almost always results from an endometrial biopsy. Since this bleeding is caused by injury, the opinion of the posek of this site, R' Yehuda Henkin, is that it does not render the woman niddah.  The bleeding may go on for about a week, and for that time can be attributed to the procedure.   Other authorities are less comfortable permitting bleeding that comes from the uterus, even if a clear source of injury is seen. Therefore, it would be best to ask a specific psak of your rabbi, if you have one. If you do not have a rabbi whom you can ask, you may rely on R' Henkin's psak.

For all procedures that enter the uterus, the size of the instrument that enters is also important. Instruments larger than a certain size render a woman niddah even if there is no bleeding. Opinions as to this size vary – R' Henkin rules that an instrument with a diameter of 19mm or more would make a woman niddah.  The catheter used for an endometrial biopsy is usually rather small, but you should double check with your physician as to what the actual size was.

Please feel free to get back to us with any further questions.

We wish you much hatzlacha!

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