Our expert says:
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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