Jinsi ya kukokotoa Osmolality
Osmolality ni nini?
Osmolality measures solute concentration in body fluids. It's critical for diagnosing hyponatremia, hypernatremia, and fluid disorders.
Fomula
Calculate: Osm = 2[Na] + (Glu/18) + (BUN/2.8)
- Na
- Na value — Variable used in the calculation
- BUN
- BUN value — Variable used in the calculation
Mwongozo wa Hatua kwa Hatua
- 1Calculate: Osm = 2[Na] + (Glu/18) + (BUN/2.8)
- 2Normal: 280-310 mOsm/kg
- 3Compare measured to calculated osmolality
Mifano Iliyotatuliwa
Ingizo
Na 128, glucose 200, BUN 28
Matokeo
Osm ≈ 318 (high), measured lower suggests hyponatremia
Pseudohyponatremia likely
Makosa ya Kawaida ya Kuepuka
- ✕Neglecting glucose and BUN contributions in hyperglycemia/uremia
- ✕Confusing osmolality with osmolarity (different in concentrated solutions)
Maswali yanayoulizwa mara kwa mara
What's the osmolal gap?
Difference between measured and calculated osmolality. Large gap suggests unmeasured osmoles (ethanol, methanol, etc.).
How does osmolality relate to sodium?
Sodium is the main determinant of osmolality; hyponatremia usually means hypoosmolality and vice versa.
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