You may be asked to follow a special
diet that is either high or low in calcium for several days before the
How It Is Done
Urine calcium is measured in a sample
taken from all the urine made in a 24-hour period.
You start collecting your urine in the morning. When you first
get up, empty your bladder but do not save this urine. Write down the time that
you urinated to mark the beginning of your 24-hour collection period.
For the next 24 hours, collect all your urine. Your doctor or
lab will usually provide you with a large container that holds about
1 gal (4 L). The container has
a small amount of preservative in it. Urinate into a small, clean container and
then pour the urine into the large container. Do not touch the inside of the
container with your fingers.
Keep the large container in the refrigerator for the 24
Empty your bladder for the final time at or just before the end
of the 24-hour period. Add this urine to the large container and record the
Do not get toilet paper, pubic hair, stool (feces), menstrual
blood, or other foreign matter in the urine sample.
How It Feels
There is no pain while collecting a
24-hour urine sample.
There is no chance for problems while collecting
a 24-hour urine sample.