Since my parents wish not to get an ultrasound to confirm if my mare is 100% pregnant or if it's a false pregnancy, (mostly because the vet said she might not be able to see anything with the ultrasound during the 4-8 month period)
Then get a new vet. Sorry, but if a vet can't find a 4-8 month old fetus with an ultrasound, they have no business using an ultrasound. From about 90 to 120 days, the weight of the fetus will usually drop the uterus and fetus over the pelvic brim and into the abdominal cavity, but while it might be difficult to palpate, it's easily located via ultrasound. And I cannot IMAGINE missing an 8 month fetus by palpation, let alone by ultrasound.
I'm going to order a wee foal test for 120-300 days.
Question is, if it is a false pregnancy will it show up positive on the test? I'm not sure if in false pregnancy they create the hormone that the test looks for.
The test is checking for eCG (equine chorionic gonadatropin) which is released by the endometrial cups. Those endometrial cups are formed from the chorionic girdle. In order to have a chorionic girdle you MUST have had a pregnancy. So, if the mare has a false pregnancy and was never bred, there would be no conceptus and consequently no chorionic girdle. No chorionic girdle, no endometrial cups. No endometrial cups, no eCG. No eCG, no false positive with the Wee Foal test. Make sense?
If you haven't read my other thread, vet is leaning toward pregnant and is having us vaccinate her just like she is.
And what is the vet basing his/her hypothesis on? And by that statement, I'm assuming that the mare has been bred. If that's the case, the above information is moot. With that said, you can have a false positive if the mare was bred and lost the pregnancy. Get someone that knows how to palpate/ultrasound. Or, have a blood test for estrone sulfate done.
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