Serum osmolarity vs. serum osmolality?

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Jedi of Zen
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Serum osmolarity vs. serum osmolality?

Post by Jedi of Zen » Sun Nov 25, 2007 11:22 pm

I'm trying to figure out the difference in definitions between serum osmolarity and serum osmolality.

My textbook (Fundamentals of Nursing, 6th edition, by Potter & Perry) states that normal serum osmolarity in the blood is 280 - 295 mOsm/kg.

However, every website that I have ever looked up on the matter states that serum osmolality is 280 - 295 mOsm/kg.

Does that mean that the 2 terms are exactly synonymous? If not, then which is wrong - my book or all of those other websites? And why?


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Post by amilam » Thu Nov 04, 2010 10:21 pm

osmolality vs osmolarity

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Post by canalon » Fri Nov 05, 2010 3:29 am


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any proof. (Ashley Montague)

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