42 CFR § 493.1255 - Standard: Calibration and calibration verification procedures.
Calibration and calibration verification procedures are required to substantiate the continued accuracy of the test system throughout the laboratory's reportable range of test results for the test system. Unless otherwise specified in this subpart, for each applicable test system the laboratory must do the following:
(a) Perform and document calibration procedures -
(b) Perform and document calibration verification procedures -
(1) Following the manufacturer's calibration verification instructions;
(i) Including the number, type, and concentration of the materials, as well as acceptable limits for calibration verification; and
(ii) Including at least a minimal (or zero) value, a mid-point value, and a maximum value near the upper limit of the range to verify the laboratory's reportable range of test results for the test system; and
(3) At least once every 6 months and whenever any of the following occur:
(i) A complete change of reagents for a procedure is introduced, unless the laboratory can demonstrate that changing reagent lot numbers does not affect the range used to report patient test results, and control values are not adversely affected by reagent lot number changes.
(ii) There is major preventive maintenance or replacement of critical parts that may influence test performance.
(iii) Control materials reflect an unusual trend or shift, or are outside of the laboratory's acceptable limits, and other means of assessing and correcting unacceptable control values fail to identify and correct the problem.
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