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Historical Expression
The historical Expression gives ability to retrieve the patient’s most recent data, and copy the same into another form field.
Example
Consider a patient who needs to calculate the weight difference between the most recent visit and the current visit. In this scenario, a historical expression will be helpful as it retrieves the patient's previous visit details, including the patient's biometric data. This allows us to fetch the patient's weight and compare the weight difference.
References:
i) Expression helper functions
ii) Date validation
iii) Hiding fields