How do i be sure that i have a kidney failure

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How to make sure of having kidney failure ?
- first step : consult an internal medicine doctor to do the needed medical examination 
- second step : doing the following examination :
1. physical examination
2. kidney function test 
3. GFR levels test 
4. CT scan or ultrasound test 
5. urine test
GFR levels :
1. normal range : 120 
2. first level of kidney failure : 90 - 60 
3. second level of kidney failure: 60 - 30 
4. third level of kidney failure : 30 - 15 
5. fourth level of kidney failure : less than 15 
What does GFR levels express ?
GFR levels express how does your kidney filtering your blood 
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