---
title: "fluid_output"
description: "The measurement of fluid lost or excreted from the body via any mechanism."
---

The measurement of fluid lost or excreted from the body via any mechanism.

**Purpose.** To record details about measured fluids lost or excreted via any mechanism.

## Source

| Model | Leg | Role |
|---|---|---|
| `openEHR-EHR-OBSERVATION.fluid_output.v1` | openEHR | defines this table |

## Columns

| Column | Type | Null | Description | Source |
|---|---|---|---|---|
| `id` | `uuid primary key` | no | Primary key. | — |
| `form_id` | `uuid` → [`form`](/docs/tables/form) | no | The form this entry was recorded on. | — |
| `form_block_id` | `uuid` | yes | The block within the form, when the entry is bound to one. | — |
| `fluid_name`<br />`fluid_name_code`<br />`fluid_name_system`<br />`fluid_name_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Fluid name | `/data[at0001]/events[at0002]/data[at0003]/items[at0036]` |
| `source`<br />`source_code`<br />`source_system`<br />`source_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Source | `/data[at0001]/events[at0002]/data[at0003]/items[at0041]` |
| `volume_magnitude`<br />`volume_units` | quantity<br />`numeric`, `text` | yes | Volume | `/data[at0001]/events[at0002]/data[at0003]/items[at0035]` |
| `comment` | `text` | yes | Comment | `/data[at0001]/events[at0002]/data[at0003]/items[at0032]` |
| `method`<br />`method_code`<br />`method_system`<br />`method_valueset_id` | coded text<br />`text`, `text`, `text`, `text` | yes | Method | `/protocol[at0008]/items[at0031]` |
| `output_device` | `uuid` | yes | Output device | `/protocol[at0008]/items[at0033]` |
| `measurement_device` | `uuid` | yes | Measurement device | `/protocol[at0008]/items[at0028]` |

## Constraints

```sql
check ((fluid_name_code is null and fluid_name_system is null and fluid_name_valueset_id is null) or (fluid_name is not null and fluid_name_code is not null and fluid_name_system is not null and fluid_name_valueset_id is not null))
check ((source_code is null and source_system is null and source_valueset_id is null) or (source is not null and source_code is not null and source_system is not null and source_valueset_id is not null))
check ((volume_magnitude is null and volume_units is null) or (volume_magnitude is not null and volume_units is not null))
check (volume_magnitude is null or (volume_units = 'ml' and volume_magnitude >= 0) or (volume_units = 'l' and volume_magnitude >= 0) or (volume_units = '[foz_us]' and volume_magnitude >= 0))
check ((method_code is null and method_system is null and method_valueset_id is null and method is null) or (method is not null and method_code is not null and method_system is not null and method_valueset_id is not null))
```

## Unique

- `form_block_id`

## References

| Columns | Target | On delete |
|---|---|---|
| `form_id` | [`form`](/docs/tables/form) | cascade |
| `form_id, form_block_id` | [`form_block`](/docs/tables/form_block) | cascade |
| `fluid_name_valueset_id, fluid_name_code, fluid_name_system, fluid_name` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `source_valueset_id, source_code, source_system, source` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `method_valueset_id, method_code, method_system, method` | [`valueset_code`](/docs/tables/valueset_code) | restrict |
| `output_device` | [`device`](/docs/tables/device) | no action |
| `measurement_device` | [`device`](/docs/tables/device) | no action |

## Indexes

- `fluid_output_form_id_idx` on `form_id`
- `fluid_output_output_device_idx` on `output_device`
- `fluid_output_measurement_device_idx` on `measurement_device`

## Value sets

| Value set | Codes |
|---|---|
| `org.openehr::openEHR-EHR-OBSERVATION.fluid_output.v1/method` | 2 |