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Example: User has a list of MRNs for participants who were given a treatment (or treated with drug 'X'). The user needs to check for samples taken from these participants and stored in the biobank.

User can create a query in OpenSpecimen and check for the samples on the basis of MRN by following the steps mentioned below:

1. Select MRN from the participant form
2. Add filter on MRN with operator 'Is One Of' and paste the MRN values in the text box provided
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3. The values can be comma, tab or new line separated
4. Add a filter for specimen, for example - Type equals 'Serum'
5. Click on 'View Records'
6. To select the desired columns for participant, visit, specimen click on 'Columns'
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7. Select the fields to be displayed in the results
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8. To export these results click on 'Export'. This would download a CSV file with the query results

Refer to the sample query to fetch participants with a few MRNs ("12345", "123", "45565") having serum samples. 

Link to the demo site to try out the query - http://demo.openspecimen.org/openspecimen/#/