Top Posts Tagged with #osmolality

You may get a question where you are given a patient’s sodium, glucose, and BUN and are asked, “Do you think this patient is hyper- or hypotonic?“ you can figure out their osmolality with the values you’re given.

Sosm= (2 x [Na+mEq/L) + (glucose mg/dL)/18 + (BUN mg/dL)/2.8 (you’ll be given the normal range for electrolytes. Sodium’s is 135-145mEq/L)

#dietetics #reminder #osmolality #BUN #sodium #glucose

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This is been the most helpful in differing osmolarity, osmolality and tonicity. It was on my first pathology test, the whole class made a big deal about it-even the ones that got it right admitted it was mostly luck and they didn't know why one answer was right over another. It was waived but it came back again in out final and the results were similarly disastrous. I honestly didn't have a problem until they began to explain it, I knew what I knew but I had no idea what my teachers were talking about it screwed me up so I hope this helps

#osmolarity #osmolality #tonicity #actual difference #nursing school #helpful

Plasma Osmolality

The normal osmolality of plasma is 300 mOsm/ L.

#laboure #osmolality #plasmaistasty

Pseudohyponatraemia

Hyponatraemia is a state of decreased serum sodium (normal range 133-146 mmol/l). It is usually caused by an increase in water rather than a decrease in sodium itself.

Pseudohyponatraemia usually occurs in diabetics when they are hyperglycaemic. The increased glucose in their blood (which can be up to an insane 50mmol/l in HONK) increases it's osmolality. An increase in osmolality draws water from the intracellular space into the bloodstream.

Seeing as electrolytes are measured as concentrations rather than as gross amounts, this increased plasma volume means that the sodium is diluted, and so there are fewer mmols of it per litre. The patient will come out as having hyponatraemia, despite their being nothing wrong with their sodium control or their fluid control. They just have too much glucose.

#red notebook #diabetes #hyponatraemia #pseudohyponatraemia #osmolality #sodium