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

Exercise 34

Given hypothetic laboratory data, calculate a freewater clearance and interpret the result.

Step 1 of 5

Consider the following hypothetic laboratory data to compute a free water clearance:

• Urine volume in 5 hours: 750 mL

• Urine osmolarity: 450 mOsm (milli osmol)

• Plasma osmolarity: 375 mOsm

Free water clearance:

• The solute free water detached from the blood plasma per unit time.

Formula to calculate free water clearance is given below,

(1)

Where,

- Free Water Clearance in mL (milli Liter) per minute.