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  2. Plasma osmolality - Wikipedia

    en.wikipedia.org/wiki/Plasma_Osmolality

    Calculated osmolarity = 2 Na + Glucose + Urea (all in mmol/L) As Na+ is the major extracellular cation, the sum of osmolarity of all other anions can be assumed to be equal to natremia, hence [Na+]x2 ≈ [Na+] + [anions] To calculate plasma osmolality use the following equation (typical in the US): = 2[Na +

  3. Osmol gap - Wikipedia

    en.wikipedia.org/wiki/Osmol_gap

    When a measure of serum solutes is calculated, it is often done in units of osmolarity. While it is possible to convert between osmolality and osmolarity, [6] thereby deriving a more mathematically correct osmol gap calculation, in actual clinical practice this is not done. This is because the difference in absolute value of these two ...

  4. Tonicity - Wikipedia

    en.wikipedia.org/wiki/Tonicity

    This is due to urea entering the cell down its concentration gradient, followed by water. The osmolarity of normal saline, 9 grams NaCl dissolved in water to a total volume of one liter, is a close approximation to the osmolarity of NaCl in blood (about 290 mOsm/L). Thus, normal saline is almost isotonic to blood plasma.

  5. Osmotic concentration - Wikipedia

    en.wikipedia.org/wiki/Osmotic_concentration

    Osmotic concentration, formerly known as osmolarity, [1] is the measure of solute concentration, defined as the number of osmoles (Osm) of solute per litre (L) of solution (osmol/L or Osm/L). The osmolarity of a solution is usually expressed as Osm/L (pronounced "osmolar"), in the same way that the molarity of a solution is expressed as "M ...

  6. Volume contraction - Wikipedia

    en.wikipedia.org/wiki/Volume_contraction

    To calculate an estimation, the total amount of substance in the body before the loss is first estimated: = where: n b = Total amount of substance before fluid loss; Osm b = Body osmolarity before loss (almost equal to plasma osmolality of 275-299 milli-osmoles per kilogram [4])

  7. Osmotic pressure - Wikipedia

    en.wikipedia.org/wiki/Osmotic_pressure

    Osmotic pressure on red blood cells. Osmotic pressure measurement may be used for the determination of molecular weights. Osmotic pressure is an important factor affecting biological cells. [4] Osmoregulation is the homeostasis mechanism of an organism to reach balance in osmotic pressure.

  8. Blood test to determine organ age could help predict ... - AOL

    www.aol.com/blood-test-determine-organ-age...

    Using a blood test to determine the biological age of a person’s organs could help treat them before they get sick, as well as predicting the progression of conditions such as Alzheimer’s ...

  9. Freezing point depression osmometer - Wikipedia

    en.wikipedia.org/wiki/Freezing_point_depression...

    The osmometer uses the solution's freezing point depression to establish its strength. It is also used to determine the level of osmotically appropriate body fluid in various chemicals dissolved in the blood using the relationship in which a mole of dissolved substance reduces the freezing point of a kilogram of water by 1.86 °C (35.35 °F). [1]

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