they can do blood tests but when i took my first snake in to the vet ask them to probe it so you know for sure if its a male or female and right after that my girl left a big nice poo on the table top. all over the vet and the assistant, i sat there and laughed. so maybe youll be as lucky as i was. vet got what he deserved after all snake poo on his clothes. that what he gets for sticking a probe up a snakes private parts. LMAO