Section 180.405 - Standard - Clinical Chemistry: Quality Control(A) Each instrument or other device shall be recalibrated or rechecked at least once on each day of use.(B) At least one standard and one reference sample (control) shall be included with each batch of unknown specimens where such standards and reference samples are available.(C) Control limits for standards and reference samples shall be recorded and available for review. Records shall also include the course of action to be instituted when the results are outside the acceptable limits.(D) Screening or qualitative chemical urinalysis shall be checked daily by use of positive and negative reference samples.