The most important items of renal function blood check are, check blood biochemistry of ion renal function, urea nitrogen, creatinine, uric acid level can reflect renal function. It is recommended that patients with renal insufficiency check blood, but also the following items to clarify the primary cause, such as check liver function biochemistry, glycated hemoglobin, glycolipid, serum iron, total iron binding capacity, vitamin B12, viral serology, thyroid function, blood routine, BNP, PTH, etc. Because of clinical renal function chronic kidney disease, the most important primary causes are chronic glomerulonephritis, hypertensive nephropathy, diabetic nephropathy, vasculitis-related kidney damage, etc. If the disease is chronic, generally the hemoglobin will be lower than normal, PTH will be increased, electrolyte metabolism disorders, etc.; if it is acute, generally the above manifestations will not occur.