> ## 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)