Thank you for posting your query on HCM.
Well looking into your problem I would like to tell you that it will be very early to comment on anything , Creatinine
and GFR can rise even after having dehydration
as you give the history . Kidney biopsy
can only give the definitive answer . If the size of kidneys would have got altered that was a matter of concern .
Blood pressure can be related to kidney problem or vice versa that needs to be seen . Presently he is on right treatment and hope he will get better with this . If he is obese he will need to reduce weight which will be better for him and also decrease the Blood pressure and cholesterol
Let the kidney biopsy come then we will see , because in such conditions when a person gets High BP
in young age it can often be secondary to Kidney conditions .