LinkBack Thread Tools Search this Thread
Old Nov 6th, 2009, 06:08 AM   1
Active BnB Member
Join Date: Nov 2009
Location: UK
Posts: 111

URINE & HCG levels

Hi there

Can anyone tell me if a urnine sample goes off in a few hours? If you take a sample of pee in the morning and wanted to test it in the evening, would the HCG levels be the same or do they fade / disappear over time?

Didn't have a test this morning so didn't know if it was a good idea to wait for 4 hours to get a fresh sample or use this mornings sample which may be better?

Hope that makes sense. I am convinced TTC makes your brain cells fade!

Any ideas - thanks

Status: Offline
Old Nov 6th, 2009, 06:21 AM   2
On a break (TTC)
Active BnB Member
Join Date: Oct 2009
Location: New York
Posts: 205

"37. Can I still use pee that's been sitting in a cup for several hours? hCG (pregnancy hormone) does break down and dissipate from urine once it leaves the body. It has a half-life of 24 hours, meaning the total amount will be cut in half for every day it sits out. If you are testing very early when only a small amount of hCG is present to begin with, that half might make a difference (for example, 25 mIU/mL of hCG will be detected with any early pregnancy test. By the time that pee sits out for a day, it has only 12.5 mIU/mL left, and only a very sensitive test may detect it.)

However, most women aren't peeing in cups and leaving it around for days; most women just want to save their FMU (or other concentrated urine) to be used later in the day (may need to purchase an HPT, want to wait for darling dearest to get home from work, may pee in a cup out of preference and then get distracted by a toddler doing a serious number on the poor kitty before you get the chance to dip the test, etc. All very common scenarios.) A few hours is unlikely to make a serious difference in the amount of hCG in your urine, so it's fine to use older pee. Putting your pee in the fridge will also slow the breakdown of the hormone, but I will disavow all knowledge of this suggestion in the event that your husband is grossed out by its proximity to his leftover pizza. "

Acouple of hours should be fine

Status: Offline
Old Nov 6th, 2009, 06:21 AM   3
Trying to conceive (TTC)
Active BnB Member
Join Date: Oct 2009
Posts: 47
no hun they stay the same they don't fade or desappear what is in your urine is in your urine and always FMU is better then anyother sample xx

Status: Offline