Potassium (K) in Urine
There is no chance for problems in collecting a
one-time or 24-hour urine sample.
A test for potassium in the urine is a
24-hour test or a one-time (spot) test that checks how much potassium is in the
urine. Potassium is both an
electrolyte and a mineral.
The normal values listed here-called a reference range-are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what’s normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Results are ready in 1 day.
Many conditions can affect potassium levels. Your doctor
will talk with you about any abnormal results that may be related to your
symptoms and past health.
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
What To Think About
- Potassium levels can also be checked in a blood
test. For more information, see the topic
Potassium (K) in Blood.
- Doctors may look
at urine potassium and blood potassium levels to see whether conditions or
medicines may be causing fluid or electrolyte imbalances. Urine potassium
levels are often high when blood levels are low or low when blood levels are
high. Urine potassium levels are affected by medicines and hormones.
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis:
Fischbach FT, Dunning MB III, eds. (2009).
Manual of Laboratory and Diagnostic Tests, 8th ed.
Philadelphia: Lippincott Williams and Wilkins.
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.
Primary Medical Reviewer
||E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
||Avery L. Seifert, MD - Urology
||September 1, 2010