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Table of Contents

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Info
titleChild specimen event

Since 4.3, when a derivative or aliquot is created, an event with processing details are added on the parent specimen. This can be used for viewing and querying purpose.

Derivatives

A derivative is a child specimen whose specimen type is different from the parent's. E.g. plasma is derived from blood.

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Available parent quantity
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titleSteps to create derivatives and aliquots from the same page
  1. From the specimen overview or 'Actions' button, click on 'Create Derivative'
  2. Enter the mandatory details like label, specimen type
  3. On the right side, click on the 'Create Aliquots' checkbox
  4. Click on 'Copy Row' to add another copy of the row added. You can change the details if needed
  5. Click on 'Submit' once you have added the derivative rows


  6. A success message is displayed stating that the derivatives are created successfully. You are redirected to the aliquot details page.
  7. Enter the aliquot details like count and quantity per aliquot in the rows.
  8. Uncheck the 'Close Parent' icon on the right-hand side across the row if you want to keep the derivatives open. The close parent option is checked by default. Click 'Submit' once done.
  9. A success message is displayed and the specimens are created
Info
title


'Available Quantity' of parent specimen

When aliquots are created, the available quantity of parent specimen is updated based upon the total quantity of aliquots created under the specimen. 

For example, if the initial quantity and available quantity is 4 ml and 2 aliquots are created each of 1 ml, the available quantity will get updated to 2 ml.

In the case of derivatives, the parent quantity is not updated. When derivative is created, they can be of any other specimen type and there is no way for OpenSpecimen to know how much parent quantity was used in the creation of derivative. Example: Plasma/Serum/Buffy Coat derived from the Whole Blood, or DNA derivatives from a specimen. Hence the parent available quantity is only updated in case of aliquots, not in the case of derivatives.