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The condition is k nown as UNILATERAL RENAL AGENESIS
. Yes they can lead a fairly normal life , as that kidney
tried to compensate. But there are chances that he/she may have other congenital problems/defects, which if present must have been revealed by now.
Also chances of developing hypertension
(high blood pressure
) are there , for which medication is available.. One has to be regular with check ups (blood pressure, urine tests ) and always be vigilant.
Dietary modifications are needed for some, low salt, low- moderate protein intake, avoiding alcohol/coffee/beverages in excess.
Most people find out later in life, and accidently that they have had only one kidney for most of there lives.
Hope for the best