@sweetlips, Please accept my welcome as noticed that this is your 1st post. As a patient with a transplanted liver and kidney, I am not qualified or even familiar with how our transplant medicatiions affect our individual bodies. However, I am curious about whether you or your husband have spoken to his transplant team about your concern of symptoms of hyperparathyroidism. Sometimes we, see symptoms at home that are not obvious during a medical appointment. And sometimes our blood labs don't clearly indicate how a patient can be affected on an individual level.
I would suggest that you speak or message his transplant coordinator in advance of the labs to that she can be alert for any indications related to his high level. Another possibility that I might consider for myself would be to talk to my PCP because he/she could refer you to a specialist if he/she feels it is necessary. How often does your husband have labs drawn? Who prescribed the daily vitamin D?