Add a Prep QC Sample

Prep quality control (prep QC) samples are introduced into the sample batch during the preparation stage. The initial weight for prep QC samples can be entered in the Data Capture screen. For more information, see Enter Initial Sample Weight.

While similar to reference material (CRM) samples, QC samples serve a distinct purpose and are not introduced at the analytical stage like reference materials. One common use of prep QC samples is to clean the sample preparation equipment using barren material after processing a batch. These washings are then included in the batch for analysis to assess the potential for cross-contamination between samples, ensuring the integrity of subsequent analysis. This practice helps monitor and minimize contamination risks during the preparation process.

Activity Steps

1. On the QC/QA ribbon tab, click Prep QC Samples.

   The Preparation QC Samples screen displays.

2. Click New.

   The Add Prep QC Sample screen displays.

3. Enter the Name.

4. Enter a Description.

5. Complete the following fields as required:

   • Append Previous Sample ID

   • Display Internal ID instead of Sample ID

   • Display Results at Sample Level—Display the results of the Prep QC Sample at sample level on the Result screen in the Instrument Run page.

6. In the Change Analysis Position field group, set the position of the Prep QC Sample:

   • No Change—Prep QC Sample position stays at the same position as in the Prep Template.

   • Beginning of the Client Job—The Prep QC Sample appears at the beginning of the client job.

   • End of the Client Job—The Prep QC Sample appears at the end of the client job.

7. Click OK.

   Note: For information on how to set up control limits for prep QC, see Set up QC Analysis Code Options.