It is difficult to comment specifically on this as the score you offer (3a) is not in the commonly used Kenney biopsy scoring system for equines. The Kenney system has 3 numerical categories, with one of the categories further subdivided - I, IIA, IIB and III (aka 1, 2a, 2b, and 3). In the Kenney system the likelihood of production of a live foal is: Category I, 80 to 90%; Category IIA, 50 to 80%; Category IIB, 10 to 50%; and Category III, 10%.
While it is possible that the section of endometrium that was evaluated was one poor section in an otherwise healthy uterus, there is research that indicated that a single sample is 92% accurate in it's representation, and that an additional 10 samples only increase the accuracy level by 4 percentage points. You can certainly have the biopsy performed again, but it may not be any different the next time around.
Thank you for the information regarding biopsies, even though it was not what I hoped to hear! But it does settle that question in my mind and I appreciate it.
After researching on the web, I should have indicated a grade III (I don't know what the A is the vet was referring to with that grading).
I guess it's time for me to stop grasping a straws, and accept that I won't be getting a foal from the mare.
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