What is Osmolality?

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Osmolality for Beginners

What is osmolality?
Osmolality is a highly effective means of determining the total number of particles present in blood, urine, or other fluids. Osmolality increases with dehydration and decreases with overhydration. There are three types of osmolality tests: urine, plasma, and stool. Urine osmolality is an important test for renal concentrating ability of the kidney. Plasma (or serum) osmolality is a useful preliminary investigation for identifying the cause of hyponatraemia. Stool or faecal osmolality can be used to assist with diagnosis of the cause of diarrhea.