In clinical practice, chronic renal failure is not divided into stages 1, 2, 3, 4, and 5, but chronic kidney disease does have a stage 2. Stage 2 chronic kidney disease refers to a glomerular filtration rate (GFR) between 60 to 90 milliliters per minute. This stage indicates that the patient's kidney function has already been somewhat impacted since the normal GFR is approximately 100-120 milliliters per minute. Patients in stage 2 of chronic kidney disease may experience certain complications such as hypertension, proteinuria, and electrolyte imbalances, and the condition is considered relatively serious.

The azotemic phase of chronic renal failure may correspond to stage 2 of chronic kidney disease, and the condition can be serious, requiring regular follow-ups. Although this stage may not involve severe complications requiring dialysis, it is crucial for patients to pay close attention, undergo regular check-ups and monitoring, address the primary disease, and slow the progression of renal failure.