If you are talking het for a recessive trait, then the only way to know for sure if to breed it out and prove it.
Lab testing would be theoretically possible, but I'm pretty sure there isn't enough known about the BP genome to know what they are looking for.
Certain morphs have "markers", but if those worked 100% of the time, it would no longer be considered a recessive trait, but just a subtle co-dom.
Of course, reputable breeders keep track of which babies are 100% hets, so that is another way you might know.
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