Bun/creatine HIGH creatinine serum low Bun normal??

[midoritori2016]

So I am 33 5’7 130. I eat natural and and walk once a day for 30 min. Despite this I have a prediabetes. It runs in my family.  

The other day  my doctor had me do routine bloodwork for yearly check up .

My bun/creatine ration was HIGH
28 (normal range:  9-23  )

BUN: 15 (normal) (range 6-20)
Creatine: .54 (low) (normal range .57 to 1)

I am on a low carb/ high protein diet.  Could this do it?

What could low creatine mean? And is that ok that bun/creatine ration is high with it?

Just not sure what to do. I was not dehydrated (had three cups of water!) prior to the blood work.

Thanks so much