Well, the last year s auditor for iso 17025 insisted that we should do calibration every month. The standard and the appendix that we got with it which is called additional instructions for accreditation of microbiological labs states, that a calibration should be done, but that the freaquncy depends of the needs of each lab. And http://www.european-...ation/ea-4-10-g states that calibration should be done annualy, like my colleagues do in the instrumental part of the lab.
Basicly, I am trying to find any document or any type of defence which I can use do elaborate the fact that I am not doing it monthly, because it is a really way to much unnecessary paperwork.
I assume you have some satisfactory calibration data using annual checking.
from BRC7 Calibration, 6.4.2 (and likely other standards also) -
at a predetermined frequency, based on risk assessment
to a defined method traceable to a recognised national or international standard where possible.
I think the above is a satisfactory interpretation of "needs" unless specifically not in compliance with text of yr iso 17025 requirements.
If you have the data and would like a short, BRC-oriented, isqn thread link for a generic-type, retrospective, risk-based procedure to validate the annual frequency please inform.