Our traits testing includes one FGF5 (coat length) variant, which is described here: https://pubmed.ncbi.nlm.nih.gov/16879338/
We currently test for the most common FGF5 variant associated with long coat length. This variant is often referred to as L or L1 by different labs. UC Davis tests for other FGF5 variants as well, which they notate as L2, L3, L4, and L5.
We are working to add more FGF5 variants to our testing. Please see What traits do you test for? for a complete list of the traits we test for.