### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi I was involved in a RTA 3 yrs ago when a 44 ton lorry hit me.  I have had back problems ever since and currently receiving more physio, particularly on my left side.  Recently after a 2nd blood test, my GP has informed me that I am in stage 3 CKD.  I have no other explanation for this, i.e. low cholesterol, low BP, Im 42 and healthy.  I also had a scan of my kidneys, liver and gallbladder in Jan 2011 approx 7 mths after my accident and was found to have gallstones.  She told me at the time of the scan, that I had scar tissue on my left kidney and that it looked to be recent, she also asked if Id had any type of infection, of which no, I had not.  I never thought to mention my car accident 7 months earlier.  My question is, is there a possibility that the damage I have was as a result of the car accident? How would I go about finding this out for definite, would my GP need to refer me to a nephrologist?  Thank you in advance.

### output:

HI I guess, your prime question is about scar of kidney, Right, so first let me clear it, that merely you stated so, otherwise actual examination of USG plate is required, if it is scar then it could be due to Your RTA, as such there is no obvious kidney related problem then you need not worry at all, you again stated that you are CKD patient for that you need to be in regular follow up with your treating physician, Goodbye. (Low BP can not be itself, there must be some obvious reason behind this, clinical examination will reveal it)