# Available Keys and Operators in Viewer
In Viewer (/viewer/#/viewer), the following keys can be used as search criteria.
Also, if you use more than one parameter, please insert "&" between each parameter.
| Item | Key | Example |
|---|---|---|
| Study Instance UID | studyinstanceuid | studyinstanceuid=1.2.392.200224.2.3000.8001 |
| Series Instance UID | seriesinstanceuid | seriesinstanceuid=1.2.392.200224.3.3000.8002 |
| SOP Instance UID | sopinstanceuid | sopinstanceuid=1.2.392.200224.3.3000.8003 |
| Patient ID | patientid | patientid=12345 |
| Accession Number | accessionnumber | accessionnumber=20180123001 |
In Viewer (/viewer/#/viewer), you can use the following operators.
| Item | Operator |
|---|---|
| Equal | = or === |