Kidneys are very important organ in human body. When blood flow into kidneys, kidney begins to do their work, they will find wastes in the blood and catch them and throw them away through urine. In another word, kidneys filtrate wastes such as creatinine, BUN and so on, then the kidneys will carry them to bladder and then they are excreted through urine.
Kidneys are damaged
Kidneys can be damaged due to many reasons such as toxic medication, severe high blood pressure, long-term diabetes, etc. when the kidneys are damaged, they can not filtrate wastes effectively, and wastes such as creatinine will stay in blood. But the wastes are not good to human body, if there are many of wastes, they do harms to human body. It also means if the wastes are more; the damages will be more severe. Hence creatinine becomes an index of kidney damages. There are five stages of kidney diseases according to severity of damages. We can know your stages according to creatinine level in blood.
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