My Creatinine is 1.7 and BP is under control, never had diabeties. How much are my kidneys damaged ?

Chronic kidney disease (CKD), also known as chronic renal disease, is a progressive loss of renal function over a period of months or years. The symptoms of worsening kidney function are unspecific, and might include feeling generally unwell and experiencing a reduced appetite.
　　Often, chronic kidney disease is diagnosed as a result of screening of people known to be at risk of kidney problems, such as those with high blood pressure or diabetes and those with a blood relative with chronic kidney disease. Chronic kidney disease may also be identified when it leads to one of its recognized complications, such as cardiovascular disease, anemia or pericarditis
　　Stage 1 CKD
　　Slightly diminished function; Kidney damage with normal or relatively high GFR (>90 mL/min/1.73 m2). Kidney damage is defined as pathologic abnormalities or markers of damage, including abnormalities in blood or urine test or imaging studies
　　Stage 2 CKD
　　Mild reduction in GFR (60-89 mL/min/1.73 m2) with kidney damage. Kidney damage is defined as pathologic abnormalities or markers of damage, including abnormalities in blood or urine test or imaging studies
　　Stage 3 CKD
　　Moderate reduction in GFR (30-59 mL/min/1.73 m2).[1] British guidelines distinguish between stage 3A (GFR 45-59) and stage 3B (GFR 30-44) for purposes of screening and referral
　　Stage 4 CKD
　　Severe reduction in GFR (15-29 mL/min/1.73 m2)[1] Preparation for renal replacement therapy
　　Stage 5 CKD
　　Established kidney failure (GFR <15 mL/min/1.73 m2, or permanent renal replacement therapy (RRT
　　When one reaches stage 5 CKD, renal replacement therapy is required, in the form of either dialysis or a transplant.
　　The normal value for BUN is approximately 10-20( (yours is at17.5), and for creatinine 0.7-1.2. ( (yours is at 1.7.).. With renal disease, both the BUN and creatinine usually rise together
　　The normal potassium level in the blood is 3.5 to 5.0 mEq/L (milliequivalent per liter.
　　So your Potassium and BUN are WNL- (within normal limits) creatinine is slightly higher.

　　From the above normal lab values, your kidney doesn't seem to be damged.