> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# observation_referencerange

Guidance on how to interpret the value by comparison to a normal or recommended range (`Observation.referenceRange[]`).

**Primary Keys:**

* observation\_referencerange\_id

**Foreign Keys:**

* observation\_id - links to the [observation](/medical-api/handling-data/schema-v100/observation/base) table

| Column | Data Type | Description |
| - | - | - |
| observation\_referencerange\_id | varchar | Unique identifier for the reference range row |
| observation\_id | varchar | Parent observation |
| low\_amount | varchar | Lower bound value |
| low\_unit | varchar | Unit for lower bound |
| high\_amount | varchar | Upper bound value |
| high\_unit | varchar | Unit for upper bound |

**Related Tables:**

**Parent:**

* [observation](/medical-api/handling-data/schema-v100/observation/base)


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.