Posted by: Wills | 2008/10/24


I would just like to know to what number do the cells have to divide before they are placed back in the womb after an IVF procedure? And how long does this normally take?


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Our expert says:
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Dear Wills

There is no strict rule as to the number of cells that have to be present in an embryo before it can be transferred. As a general rule most transfers take place on around day 3 after aspiration. On the 3rd day after aspiration the embryo will usually be in the 8-cell stage. However transfer can also take place on day 4 or day 5 when special culture mediums are used to grow them to a further stage of development. Day 4 will normally result in a 16 or 32-cell stage and day 5 will in fact be at a compacted morula stage. Most clinics today will transfer on day 3, day 4 or day 5 after aspiration is done.

Answered by: Dr. Y.M. Dasoo

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