The problem is usually to STOP the bacteria growing - urine is nutritious -
carbon and nitrogen sources, salts, all sorts of other stuff...
GS
Alan Junkins wrote in message ...
>In the clinical laboratory the rule of thumb is that urines can
>be stored at 4C for up to 24 hours. But then we are
>interested in doing colony counts. After 24 hours the colony
>counts will be wrong
