Hyponatremia Query

When training in my early CDI days, I was told that I could query for hyponatremia with two low NA values as clinical indicators as it shows that it is being monitored (not necessarily being treated). Discussions recently with one of our group veterans discredited this approach. I know all about pseudo-hyponatremia with hyperglycemia and would never query for hyponatremia with a markedly elevated glucose. My question is if I had a NA - 130 yesterday, & a NA - 128 today (both with glucose WNL), would these clinical findings in & of themselves qualify as valid clinical indicators to query for hyponatremia.
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