Crypto is cryptosporidium and no that can not be tested with a fecal. THey can only determine crypto with a stomach wash or a necropsy.
Fecals are to test for parasites like pin worms, round worms, coccidia. THings like that. and the vet will know what to look for without you telling him or at least he/ she should know.
1.2 Bearded dragons (Login, Raven, & Jean Grey) 1.1.1 Corn snakes(Havoc,Sable, & Kink0 1.5 Leo's (Psyloke (Lucky-male) Speedball, Domino, Rouge, Siren, Elektra) 1.0 Veiled Chams (Neo), 0.1 Rose Hair T. (Night Crawler) 0.0.3 Crested Geckos (Shiva, Storm, Beast) 0.2 Kenyan Sand Boas (Tigra & Cloak)