Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 50

The normal serum osmolarity is:

A. 50 to 100 mOsm

B. 275 to 300 mOsm

C. 400 to 500 mOsm

D. 3 times the urine osmolarity

Step 1 of 2

Serum osmolarity:

It is the test to detect the amount of chemicals present in serum.

• The test is to conclude the water balance and chemicals which are dissolved in blood.

• The normal value of serum osmolarity is from 275 to 300 mOsm (milliosmole).

• High osmolarity levels of serum in the body indicate,

o Dehydration of the body.

o In case of kidney damages which causes excess of urea in blood.

Therefore, “275 to 300 mOsm” is the normal osmolarity of serum. Hence, the correct answer is option.