“…However, the sodium concentration does not provide reliable, instantaneous information as a time lag must be considered before lowered sodium levels appear following fluid absorption [12]. This is evident when the absorption is predominantly extravascular (for instance, because of a breach in the prostatic capsule): in these cases the hyponatremia is quite small, only about one third of the hyponatremia expected to result from absorption of the same amount of fluid by the intravascular route [12,13].…”