VA ratings for Idiopathic hypersomnia/narcolepsy before MSLT

Hello! I’m posting for my fiancé. I wanted to know if anyone’s gotten a rating for IH/N2 while still waiting for their MSLT test. He has left the military but has a good medical record of worsening fatigue that started in service. He saw a sleep doctor and his assessment was ‘probable’ idiopathic hypersomnia. But we still have over a month till his MSLT to confirm diagnosis and/or rule out narcolepsy.

my understanding is the MSLT is to differentiate between Narcolepsy and IH- so he’ll have one or the other. Side note: He has sleep apnea (in service) and is treated by CPAP. But both IH/N2 are rated under epilepsy. His sleep attacks, symptoms, etc are all in his private medical records and he had his C&P exam. The examiner noted everything but stated the lack of an MSLT may cause a problem despite his progression of symptoms being well documented. We suspect we’ll have to test done by the time VA makes a decision, so hopefully they’ll take the new data into account but I wanted to see if anyone’s been successful getting a rating while waiting for an MSLT.

Thank you!