# Data Dictionary

## Patient ID
The primary key for patient records, formatted as UUID v4.
Used across all clinical systems for cross-referencing.

## Test Name
The standardized name of the laboratory test as defined by LOINC.

## Result Value
The numeric measurement result of the laboratory test.
Expressed in SI units where applicable.

## Reference Range
The normal expected range for the test result.
Defined by the performing laboratory.

## Collection Date
The date and time when the specimen was collected from the patient.
