Urine sodium can be checked in a single
urine sample but it is more often measured in a 24-hour urine sample.
Clean-catch midstream one-time urine collection
Wash your hands to make sure they are clean
before collecting the urine.
If the collection cup has a lid,
remove it carefully and set it down with the inner surface up. Do not touch the
inside of the cup with your fingers.
Clean the area around your
A man should retract the foreskin, if
present, and clean the head of his penis with medicated towelettes or
A woman should spread open the genital folds of skin with
one hand. Then use her other hand to clean the area around the
urethra with medicated towelettes or swabs. She should
wipe the area from front to back so bacteria from the
anus is not wiped across the urethra.
Begin urinating into the toilet or urinal. A
woman should hold apart the genital folds of skin while she
After the urine has flowed for several seconds, place the
collection cup into the urine stream and collect about
2 fl oz (60 mL) of this
"midstream" urine without stopping your flow of urine.
touch the rim of the cup to your genital area. Do not get toilet paper, pubic
hair, stool (feces), menstrual blood, or anything else in the urine
Finish urinating into the toilet or
Carefully replace and tighten the lid on the cup then
return it to the lab. If you are collecting the urine at home and cannot get it
to the lab in an hour, refrigerate it.
Urine collection over 24 hours
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
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 either container with your
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 discomfort in collecting a
one-time or 24-hour urine sample.