Wentworth-Douglass Hospital
(603) 742-5252
Decrease (-) Restore Default Increase (+) font size
Physicians
Site Search

Urine concentration test
Urine concentration test


Female urinary tract
Female urinary tract


Male urinary tract
Male urinary tract


Definition:

A urine concentration test measures the ability of the kidneys to conserve or excrete water appropriately.

See also:



Alternative Names:

Water loading test; Water deprivation test



How the test is performed:

For this test, the specific gravity of urine is measured before and after one or more of the following:

  • Water loading -- drinking excessive amounts of water or receiving fluids through a vein
  • Water deprivation -- avoiding fluids for a certain amount of time
  • ADH administration -- receiving antidiuretic hormone (ADH), which should cause the urine to become concentrated

The test requires a clean-catch urine sample.

To obtain a clean-catch sample, men or boys should clean the head of the penis. Women or girls need to wash the area between the lips of the vagina with soapy water and rinse well.

As you start to urinate, allow a small amount to fall into the toilet bowl to clear the urethra of contaminants. Then, put a clean container under your urine stream and catch 1 to 2 ounces of urine. Remove the container from the urine stream. Cap and mark the container and give it to the health care provider or assistant.

For infants, thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on the infant. For boys, the entire penis can be placed in the bag and the adhesive attached to the skin. For girls, the bag is placed over the labia. Diaper as usual over the secured bag.

This procedure may take a couple of attempts -- lively infants can displace the bag. The infant should be checked frequently and the bag changed after the infant has urinated into the bag. The urine is drained into the container for transport to the laboratory.



How to prepare for the test:

Eat a normal, balanced diet for several days before the test. Your health care provider will give you instructions for water loading or water deprivation.

Your health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. Drugs that can affect measurements include dextran and sucrose, and x-ray contrast medium (dye) received within 3 days.



How the test will feel:

The test involves only normal urination, and there is no discomfort.



Why the test is performed:

This test is most often done if your doctor suspects diabetes insipidus . The test can help differentiate it from nephrogenic diabetes insipidus .

This test may also be done if you have signs of SIADH (syndrome of inappropriate ADH).



Normal Values:

In general, normal values are as follows:

  • 1.010 to 1.025 (normal specific gravity)
  • 1.001 after drinking excessive amounts of water
  • More than 1.025 after avoiding fluids
  • Concentrated after receiving ADH

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.



What abnormal results mean:

Increased urine concentration may indicate:

  • Dehydration
  • Diarrhea
  • Excessive sweating
  • Glucosuria
  • Heart failure (related to decreased blood flow to the kidneys)
  • Renal arterial stenosis
  • Syndrome of inappropriate antidiuretic hormone secretion (SIADH )
  • Vomiting
  • Water restriction
Decreased urine concentration may indicate:
  • Excessive fluid intake
  • Diabetes insipidus
  • Renal failure (loss of ability to reabsorb water)
  • Pyelonephritis
Additional conditions under which the test may be performed:

What the risks are:




Review Date: 10/22/2007
Reviewed By: Robert Mushnick, M.D., Clinical Assistant Professor, Department of Nephrology, SUNY Downstate Health Center, Brooklyn, NY. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
adam.com


Find What You Need

Events
Careers
Foundation
About Us
Contact
Directions
News
Social Media Agreement
Joint Notice
Web Privacy Policy
WDH Staff Portal

Centers & Services

Cancer Center
Cardiovascular Care
Joint Replacement
Women & Children's
Physician Offices
Other Services

Conditions & Treatments

Health Information
Ebola Information

Support Services

Support Groups
Care-Van
Dental Center
Social Work
Food & Nutrition
Integrative Wellness
Spiritual Care
Concerns & Grievances
Homecare and Hospice

For Patients

Pay Your Bill Online
Pricing Estimates
Financial Assistance
Interpreter Services
Surgery Preparation
Medical Record Request
Advance Directives
Clinical Research & Trials

For Healthcare Professionals

Work and Life
Financial Well-Being
Career and Growth

The Wentworth-Douglass Health System includes:

 

Address

Wentworth-Douglass Hospital
789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100