# LD browser

[Linkage disequilibrium](https://docs.finngen.fi/background-reading/linkage-disequilibrium-ld) server, for finding variants in LD with variant of interest. More on ld\_server on [github](https://github.com/FINNGEN/ld_server).

### Example:

* variant= `6:44693011:A:G`
* window=`1000000`
* reference panel: `sisu42` and
* ld threshold = `0.9`:

`http://api.finngen.fi/api/ld?variant=6:44693011:A:G&window=1000000&panel=sisu42&r2_thresh=0.9`

{% embed url="<http://api.finngen.fi/api/ld?variant=6:44693011:A:G&window=1000000&panel=sisu42&r2_thresh=0.9>" %}

You can get the variants in LD with the parameters you want by changing the query parameters in the example url. Parameters `variant`, `window` and `panel` are required query parameters. `r2_thresh` is optional.

Variant needs to be in format chr:pos:ref:alt. Can have chr prefix. X can be X or 23.

Window size is limited to 100000-5000000.

Currently sisu V4.2 (panel parameter value `sisu42`), sisu V4 (panel parameter value `sisu4`) and sisu V3 (panel parameter value `sisu3`) imputation panels are supported. These panels contain the same variants as imputed FinnGen data: sisu3 until data freeze 7, sisu4 in data freezes 8 and 9, sisu4.2 from data freeze 10 onwards.