Flows:

• Close—Close this form.
• Save—Save form updates.
• Save as—Save the current entity as a new entity.
• Delete—Delete the current entity.
• <<—Update Tolerance 1 based upon statistics held on the scheme, latest version, and analyte:
  • Tolerance 1 = SVA's Statistical detection limit / Expected value x 100 + SVA's Limiting repeatability

Form:

• Expected value—The expected value that the quality control type must attempt to achieve for the scheme and analyte.
• Use absolute tolerance—Indicates whether an absolute tolerance is used instead of a relative tolerance.
• Tolerance 1—The lower or failure limit tolerance:
  • Where the Use absolute tolerance check box is checked:
    • Lower action limit = Tolerance 1
  • Where the Use absolute tolerance check box is unchecked:
    • Lower action limit = Expected value - Expected value x Tolerance 1 / 100
    • Lower warning limit = Expected value - (Expected value x Tolerance 2) x 1.96 / 3.09
• Tolerance 2—The upper or warning limit tolerance:
  • Where the Use absolute tolerance check box is checked:
    • Upper action limit = Tolerance 2
  • Where the Use absolute tolerance check box is unchecked:
    • Upper action limit = Expected value + Expected value x Tolerance 1 / 100
    • Upper warning limit = Expected value + (Expected value x Tolerance 2) x 1.96 / 3.09
• Readings—The number of readings that exist for the quality control type scheme analyte.
• Mean—The average value of all readings.
• Minimum—The minimum value of all readings.
• Maximum—The maximum value of all readings.
• Relative s.d.—The relative standard deviation of all readings.