Chemotaxis (from chemo- + taxis) is the movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment.
It will be good for up to six months, in the vacuum seal, if stored in the refrigerator. If frozen in the vacuum seal, it can last for about 1 year. Once the sample is removed from the vacuum seal, it should not remain at room temperature for more than 18 hours. It will keep in the refrigerator, unsealed, for 30 days.
When I know I'll be tested, I thaw the urine at room temperature overnight (still sealed). At most it's at room temp for 6-8 hours. There will invariably be sediment collected at the bottom of the sample and that is normal. frozen urine sample can last up to one year. I haven't tested this-but it seems to be the general consensus on these forums and on other discussions I've seen on the net. I've used urine stored for over a month without complications, so using yours after a week of storage should be fine.