@drmomoshakeel: Hyponatremia on call can get confusing fast, so the key is having a framework. Confirm it’s true hypotonic hyponatremia, assess how symptomatic they are, then use volume status + urine studies to work out the cause. And remember, the danger isn’t just the low sodium. Correcting it too quickly can be dangerous too. Follow for more of the On Call Series. For the common lab + urine patterns, this is the quick cheat sheet I’d use: * Low serum osm + urine osm <100 * Think primary polydipsia * Low solute intake like beer potomania / “tea and toast” * Low serum osm + urine osm >100 + urine Na <20 to 30 * Think hypovolemia * GI losses * Poor intake * Or low effective circulating volume * Heart failure * Cirrhosis * Low serum osm + urine osm >100 + urine Na >30 * Think SIADH * Adrenal insufficiency * Hypothyroidism * Renal salt loss * Diuretics can muddy this picture * High glucose + low Na * Think translocational hyponatremia from hyperglycemia * Normal serum osmolality + low Na * Think pseudohyponatremia * Severe hypertriglyceridemia or paraproteinemia, depending on the lab method For a really clean text overlay: Urine Osm <100 → ADH OFF Urine Osm >100 → ADH ON Then: Urine Na <30 → body thinks volume is low Urine Na >30 → SIADH / adrenal / renal causes That is probably the most useful quick interpretation for an on-call video. #medicine #resident #residency #oncall

drmomoshakeel

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Sunday 20 September 2026 20:17:38 GMT