Previous studies had shown similar correlation with renin and aldosterone concentration.

I know that it's less than 6% of all community-acquired pneumonia, but legionella can give you an isovolemic hypoosmolar hyponatremia by suppressing the renin-angiotensin-aldosterone system.

Now, without that aldosterone, you just keep losing sodium in the urine, and you may end up with type 4 renal tubular acidosis, you know, with the hyperkalemia and the hyperchloremia and just... that's why I want her tested for legionnaires'.