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?
Thanks!