Hi,
You may not have any symptoms at all, as remember you do have two kidneys and can quite happily live on one. If one kidney malfunctions, then the other one will take over all the work of the other kidney.
If you have decreased renal function generally, then the symptoms depend on whether it is of acute or chronic onset, however, if it is slow onset, then you may notice that you have either increased or decreased urine output, you may be tireder than normal, your weight may increase or decrease, you may have blood pressure problems, higher rather than lower and some dizzyness on standing maybe. You could also have frothy urine which contains some protein.
If you went to a doc for blood tests, then the best indicator of renal function is the creatinnine level in the blood. When functioning normally, the kidneys will filter creatininnine and it will be passed out in the urine, as it is a by product of muscle metabolism. In cases of decreased renal function, then the blood level will be higher. Anything above about 150 to 200 per ml of blood would be an abnormal reading. Patients who are just about to start dialysis can very often have a creatinnine of about 500 or more. The Urea level is also significant, as in the blood this is toxic and is what causes the decreased appetite, feeling nauseous, tiredness and mental confusion.
Acute states of renal impairment can be caused by severe trauma and blood loss, but mostly this is a cause of Acute Renal Failure and is reversible with the right treatment.
Hope this helps and post back with any more questions or if anything that I have written is not clear?
Take care
Sarah
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