Hyponatremia

We're all familiar with te fina of less than one, suggesting that a patient's pre ren all right. We can use it with some degree diagnostic accuracy of assessing the renangotensina dostron system in an indirect way. But we also know that urine sodium interpretation isn't really valid in patients on diaretic therapy since these drugs work by blocking the kidneys ability to re absorb sodium. And just like when we get inta jam with patients with a k i, here comes puria to the rescue.