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

# Python SDK - Working with OMOP domains

> Work with OMOP domains in the OMOPHub Python SDK - list Condition, Drug, Measurement, and Procedure domains and query their concepts from Python code.

## List All Domains

Get a list of all available OMOP domains:

```python theme={null}
# Basic list
result = client.domains.list()
for domain in result["data"]["domains"]:
    print(domain["domain_id"])

# Include concept counts and statistics
result = client.domains.list(include_stats=True)
for domain in result["data"]["domains"]:
    print(f"{domain['domain_id']}: {domain['concept_count']} concepts")
```

## Get Domain Concepts

Retrieve all concepts within a specific domain:

```python theme={null}
# Basic usage
result = client.domains.concepts("Condition", page_size=100)
for concept in result["data"]["concepts"]:
    print(f"{concept['concept_name']} ({concept['concept_id']})")

# Filter by vocabulary
result = client.domains.concepts(
    "Condition",
    vocabulary_ids=["SNOMED", "ICD10CM"],
    page_size=50
)

# Standard concepts only
result = client.domains.concepts(
    "Drug",
    vocabulary_ids=["RxNorm"],
    standard_only=True,
    page_size=100
)

# Include invalid/deprecated concepts
result = client.domains.concepts(
    "Procedure",
    include_invalid=True,
    page=1,
    page_size=50
)

# Pagination
print(f"Page {result['meta']['pagination']['page']} of {result['meta']['pagination']['total_pages']}")
print(f"Total: {result['meta']['pagination']['total_items']} concepts")
```

### Parameters

| Parameter         | Type       | Default  | Description                                   |
| ----------------- | ---------- | -------- | --------------------------------------------- |
| `domain_id`       | str        | required | Domain identifier (e.g., "Condition", "Drug") |
| `vocabulary_ids`  | list\[str] | None     | Filter to specific vocabularies               |
| `standard_only`   | bool       | False    | Return only standard concepts                 |
| `include_invalid` | bool       | True     | Include deprecated concepts                   |
| `page`            | int        | 1        | Page number                                   |
| `page_size`       | int        | 50       | Results per page (max 1000)                   |