Introduction

The samples stored in the freezer may be taken out for processing and different tests. This might result in the sample being frozen and thawed multiple times. Tracking this is essential to decide the quality of the sample.

In OpenSpecimen, ‘Freeze/Thaw Cycles’ can be tracked during:

1. Creation of parent and child specimens

2. Creation of frozen and thaw event

Tracking ‘Freeze/Thaw Cycles’ during specimen creation

By default, when specimens are created, the value for ‘Freeze/Thaw Cycles’ is zero for primary specimens. If user wants to set value for this field, it can be edited on the single specimen page:

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When unplanned derivative or aliquots specimens are created, freeze/thaw cycle of parent is incremented by one and the child’s freeze/thaw cycle will be set to ‘parent value + 1’.

JSON Configuration

If user does not want freeze/thaw cycle to be incremented automatically, admin can configure to include these fields during child creation. For more details on configuration of this via JSON, refer to https://openspecimen.atlassian.net/wiki/x/NQB7Fw

Tracking ‘Freeze/Thaw Cycles’ in events

There are 2 events that capture the freeze/thaw of the samples - ‘Frozen Event’ and ‘Thaw Event’. If user clicks on ‘Increment Freeze/Thaw Cycles’ when adding the event, it will increase the value for that specimen by 1.

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