---
title: "Lookup variant_idx by genomic coordinates"
method: GET
path: "/sessions/{session_id}/variants/lookup"
tags: ["findings"]
---

# Lookup variant_idx by genomic coordinates

`GET /sessions/{session_id}/variants/lookup`

## Request

- Base URL: `https://api.helena.bio` (the document declares no server; this is the origin it was published from)
- URL: `https://api.helena.bio/sessions/{session_id}/variants/lookup`
- Auth: none declared

Resolve variant_idx from chromosome, position, ref, alt. Used for cross-session navigation.

## Path parameters

- `session_id` string, uuid, required

## Query parameters

- `chromosome` string, required
- `position` integer, required
- `ref` string, required
- `alt` string, required

## Response `200`

Successful Response

- object

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/helena/apis/helix-insight-variant-analysis-service.md) · [All operations](https://skmtc.dev/helena/apis/helix-insight-variant-analysis-service/llms.txt) · [OpenAPI document](https://skmtc.dev/helena/apis/helix-insight-variant-analysis-service/revisions/fe51fd20cdf1?raw)