---
title: "fluid_balance"
description: "The difference between fluid input and output during a specified interval of time."
---

The difference between fluid input and output during a specified interval of time.

**Purpose.** To record the cumulative or total amounts of fluid input and output, plus an estimation of the fluid balance status of an individual over specified intervals of time.&#xD; &#xD; To record the estimation of the difference between fluid input and output during a specified interval of time.

## Source

| Model | Leg | Role |
|---|---|---|
| `openEHR-EHR-OBSERVATION.fluid_balance.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. | — |
| `event_type` | `text` | yes | null represents any_event | — |
| `total_input_magnitude`<br />`total_input_units` | quantity<br />`numeric`, `text` | yes | Total input | `/data[at0001]/events[at0002]/data[at0003]/items[at0005]` |
| `total_output_magnitude`<br />`total_output_units` | quantity<br />`numeric`, `text` | yes | Total output | `/data[at0001]/events[at0002]/data[at0003]/items[at0006]` |
| `insensible_loss_magnitude`<br />`insensible_loss_units` | quantity<br />`numeric`, `text` | yes | Insensible loss | `/data[at0001]/events[at0002]/data[at0003]/items[at0004]` |
| `fluid_balance_magnitude`<br />`fluid_balance_units` | quantity<br />`numeric`, `text` | yes | Fluid balance | `/data[at0001]/events[at0002]/data[at0003]/items[at0007]` |
| `insensible_loss_formula` | `text` | yes | Insensible loss formula | `/protocol[at0009]/items[at0010]` |

## Constraints

```sql
check ((total_input_magnitude is null and total_input_units is null) or (total_input_magnitude is not null and total_input_units is not null))
check (total_input_magnitude is null or (total_input_units = 'ml' and total_input_magnitude >= 0) or (total_input_units = 'l' and total_input_magnitude >= 0) or (total_input_units = '[foz_us]' and total_input_magnitude >= 0))
check ((total_output_magnitude is null and total_output_units is null) or (total_output_magnitude is not null and total_output_units is not null))
check (total_output_magnitude is null or (total_output_units = 'ml' and total_output_magnitude >= 0) or (total_output_units = 'l' and total_output_magnitude >= 0) or (total_output_units = '[foz_us]' and total_output_magnitude >= 0))
check ((insensible_loss_magnitude is null and insensible_loss_units is null) or (insensible_loss_magnitude is not null and insensible_loss_units is not null))
check (insensible_loss_magnitude is null or (insensible_loss_units = 'ml' and insensible_loss_magnitude >= 0) or (insensible_loss_units = 'l' and insensible_loss_magnitude >= 0) or (insensible_loss_units = '[foz_us]' and insensible_loss_magnitude >= 0))
check ((fluid_balance_magnitude is null and fluid_balance_units is null) or (fluid_balance_magnitude is not null and fluid_balance_units 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 |

## Indexes

- `fluid_balance_form_id_idx` on `form_id`

