Renal failure patients needs to be done to check

First, the urine test
Oliguria, urine output ≤ 17ml / h or <400ml / d, low urine specific gravity <1.014 or fixed at about 1.010, urine acidic urine protein qualitative + + + + urine sediment microscopy shows coarse granular casts, a small number of red and white blood cells.
Second, the azotemia
Blood urea nitrogen and creatinine levels. Azotemia not alone as a basis for diagnosis and urea nitrogen in patients with gastrointestinal bleeding due to normal renal function, there will be increased. Creatinine level, blood urea nitrogen / serum creatinine ≤ 10 is an important diagnostic indicator.
In addition, urine / blood urea <15 (normal urine the urea 200-600mmol/24h, urine / blood urea> 20), urine / serum creatinine ≤ 10 also has its diagnostic significance.
Third, the blood test
Red blood cells and hemoglobin decreased, leukocytosis, and thrombocytopenia. Blood potassium, magnesium, phosphorus, increased serum sodium is normal or slightly reduced, blood calcium decreased, carbon dioxide combining power will be reduced.
Fouth, Urinary sodium Quantitative> 30mmol / L
Determination of filtration fractional excretion of sodium (FENa), the clear cause a certain significance.
Fifth, Pure water to clear rate measurement
The law helps early diagnosis.
Pure water clearance = urine (1 hour) (1 - urine osmolality / osmolality)