The renal function which can tested by blood tests

Renal function indicators often include urea, creatinine, cystatin C, beta 2 microglobulin and uric acid.
Urea nitrogen: there are great effects of diet, exercise and metabolic rate.
In addition to being vulnerable, urea nitrogen has another major drawback: it's not sensitive enough, and kidney function often loses two-thirds of its value before it starts to rise.
Serum creatinine: content of muscles (men and women, old and young, people of different RACES have differences) and exogenous creatinine (which includes the pork, beef and mutton, they can also be decomposed to produce creatinine), is not accurate enough.
The increase of blood creatinine indicates a decrease in renal function.
The renal function which can tested by blood tests
Creatinine is a metabolite of the muscles of the body, so the higher the muscle mass, the higher the creatinine.
As with urea nitrogen, the early warning function of blood creatinine is not good enough, and it is usually only when the kidney function is lost more than half of the time that the blood creatinine abnormality can be tested.
(inhibition C: this kind of material by the body of the continuous and constant nucleated cells to release and then only by glomerular filtration, although be proximal renal tubular reabsorption, yet after absorption is broken, do not return the blood.
It is not affected by diet, exercise, age, gender, etc., so cystatin C is considered to be a natural indicator of kidney function in the human body.

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