Timed Urine Collection for Creatinine Clearance (24 Hour)
When you receive a lab order from your
doctor or clinic, go to the UW Health Clinic
Lab or the Outpatient Lab at University
Hospital. You will be given a plastic jug to
collect and store your urine. The jug will
have a label on it on how to collect your
This test requires a blood creatinine level
to be drawn within 24 hours that you
collect your urine. Follow your orders to
be sure your test is complete.
1. If you had your blood drawn on the
same day you picked up the urine
jug, you must start collecting urine
the next day or you will need to have
your blood drawn again when you
return with the jug. At outreach, we
tell patient they will be drawn when
they return their urine jug. Quite
often, patients will not collect when
scheduled to collect.
2. When you wake up on the day you
start to collect (void) your urine.
Urinate in the toilet. Do not put this
first urine in the jug.
3. Write the date and time that you
voided this urine into the toilet on
the label as the START
4. During the next 24 hours, collect
(void) all of your urine into the jug.
You may use a hat to collect urine
and then transfer to jug.
5. When you wake up the next day,
urinate into the jug. Make sure you
wake up around the same time on
both days. The start and end times
must be about the same on both days
(within one hour).
6. Write the date and time you urinate
as the END DATE/TIME on the
7. If you did not have your blood
drawn when you picked up the urine
jug, you must deliver the jug to the
lab on the same day you complete
the urine collection and have your
blood drawn. Your blood draw must
be within 24 hours of the START
DATE/TIME or the END
DATE/TIME that you collect your
During the time you are saving your urine,
store the jug in a large plastic bag in the
refrigerator. Also, you can put the jug in a
cooler with ice around it.
You must label the jug in two ways. Your
full name and medical record number are
best. Your full name and date of birth are
also okay. Seal tightly and take the 24-hour
urine jug to the University Hospital
Outpatient Lab at or any of the UW Health
Clinic lab site. See www.uwhealth.org/lab
for sites. When you take the jug to the lab,
the staff must double check to make sure it
has a correct label and confirm your blood
test is completed.
Your test results will be sent to your health
care provider. You will get results by
phone, letter or at your next clinic visit.
Your health care team may have given you this information as part of your care. If so, please use it and call if you
have any questions. If this information was not given to you as part of your care, please check with your doctor. This
is not medical advice. This is not to be used for diagnosis or treatment of any medical condition. Because each
person’s health needs are different, you should talk with your doctor or others on your health care team when using
this information. If you have an emergency, please call 911. Copyright ©12/2016. University of Wisconsin Hospitals
and Clinics Authority. All rights reserved. Produced by the Department of Nursing. HF#6899.