I'm a bit late to this conversation, but will tell you all what I know.
I contacted this lab while my androgynous chicken was still alive, and was told that test results would only show the predominate sex; testing had no ability to show if both sexes were present. For that reason I didn't submit blood or feathers for testing.
After my androgynous chicken passed away at age 4 and a 1/2 years old, I submitted her body to my state lab to have an official necropsy with microscopic exam of the gonads and reproductive tract performed. Upon visual inspection, the chicken appeared to have an ovary, oviduct, and two testicles. Upon microscopic exam, both gonads that appeared to be testicles were ovotestes.
Chromosome testing would have been ideal, but i couldn't locate a lab that would do chromosome testing while "she" was alive, and also couldn't locate a lab that would do chromosome testing during the last week of her life, when i knew she was slowly dying. (Necropsy also showed she died of intestinal cancer.) Here is an article about hermaphrodite chickens that were chromosome-tested and found to have triploid chromosomes zzw.
https://pubmed.ncbi.nlm.nih.gov/8257394
@NatJ already posted my chicken's thread, but here it is again for anyone who is interested. If i could have found a lab to have her chromosomes tested, i fully believe she would have been triploid zzw too.
I would have too, but at that time the microscopic exam by my state lab was the best I could do. Maybe
@CityFarmerRob can take it to the next level. On that note,
@CityFarmerRob , I doubt if you will get much more from the vet exam other than a vet bill, but hope I'm wrong. As others have suggested already, it would be helpful if you would post a photo here of your bird's vent. Also, in your initial post, you included a photo of your bird taken from the right side. Could you also post a photo taken of the left side of your bird? There is a "famous" photo on the internet of a gyandromorph/"half-sider" cardinal, with the left side being female and the right side being male. There was speculation the cardinal could possibly be fertile and lay eggs, since her left side was female and so might have a functioning ovary. Here is an article with photo of that cardinal.
https://www.usatoday.com/story/news...d-photographed-erie-warren-county/4554937001/