This article explains how to select the preferred %CV calculation method (actual SD or expected SD) in the QC Settings page, including where to find the option and how it affects reports and LJ charts.


Who should use this:

  • Lab admins who want to switch between calculated and expected SD for %CV

  • Support team members assisting customers with this change

Step 1. Access QC Settings

  • Login to the application and go to QC Settings.

  • You’ll find this option in the left-side menu under the QC module.



Step 2. Find the “How should we calculate CV in reports?” section

  • Scroll down to the CV Calculation Method section.

  • This section has two card-style options to choose from.



Step 3. Select your preferred calculation method

  • Use actual SD (based on lab results):

    • The system will calculate the SD from your QC data and use it to compute %CV.

    • Formula: %CV = (Standard Deviation / Mean) × 100

    • This is the default for all labs.

  • Use expected SD (from kit or manual entry):

    • The system will use the SD value you’ve entered or the one provided in the QC kit.

    • Formula: %CV = (Expected SD / Mean) × 100




Step 4. Save your settings

  • After selecting the desired option, click Save Settings at the bottom of the page.



Step 5. Impact of this change

  • This setting affects all %CV values shown in QC summary tables, LJ charts, and any other place %CV is displayed.

  • The setting is lab-specific and only affects your lab’s reports.

Notes:

  • If you don’t change this setting, your lab will continue using the default calculation (actual SD).

  • You can switch between options at any time.