Hi, I had gone through your question and understand your concerns. Yes, this is true, but also amonia smell and kidneys function are not very related so this should not worry you. If you have any doubts you can do blood urea and creatinin to see if kidneys work well. In some cases if this become constant or new smells occur,then you should see ENT doctor since it may sometimes indicate problems with nose and sinus infections or olfactory nerve issues. But , in most cases this is not indicating any pathological process. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health.