Page 1822 - Saunders Comprehensive Review For NCLEX-RN

clearance is usually collected for 24
hours, but shorter periods such as 8 or
12 hours could be prescribed.

The creatinine clearance test provides the

best estimate of the GFR; the normal GFR is
125 mL per minute in a young adult. The GFR
decreases with age (10% for each decade). By age
65 years the GFR approximately 65 mL per minute.
2. Interventions
a. Encourage fluids before and during the
test.
b. Instruct the client to avoid caffeinated
beverages during testing.
c. Check with the primary health care
provider (PHCP) regarding the
administration of any prescribed
medications during testing.
d. Instruct the client about the urine
collection.
e. At the start time, ask the client to void
(or empty the tubing and drainage bag
if the client has a urinary catheter) and
discard the first sample.
f. Collect all urine for the prescribed time.
g. Keep the urine specimen on ice or
refrigerated and check with the
laboratory regarding adding a
preservative to the specimen during
collection.
h. At the end of the prescribed time, ask
the client to empty the bladder (or
empty the tubing and drainage bag if
the client has a urinary catheter) and
add that final urine to the collection
container.
i. Send the labeled urine specimen to the
laboratory.
j. Document specimen collection, time
started and completed, and pertinent
assessments.
J. KUB (kidneys, ureters, and bladder) radiography
1. Description: An x-ray of the urinary system and
adjacent structures to detect urinary calculi.
2. Interventions: No specific preparation is necessary.
K. Bladder ultrasonography (bladder scanning)
1. Bladder ultrasonography is a noninvasive method for

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