For this check to have meaning you have to know what the alowable static RPM range is (this information will be in the POH).
Actually, I just checked the PA-28-161 Cadet POH and the AFE C152 notes I have here (sorry, that's all I have available) and they do not specify a minimum static RPM that should be achieved in the early stages of the take-off roll.
The only place I found a reference about static RPM is in the Limitations section, and that only specifies a minimum and maximum static RPM with regards to propellor tolerance. And only for Sea Level/ISA conditions.
So although there is good reason to check the RPM straight after applying full power at the start of the take-off roll, I doubt whether all planes will have the minimum RPM number in their POH. Your gut feeling may be the best to go by.