# Understanding LIMS ID Prefixes

Some of the more common LIMS ID prefixes are listed in the following table.

| 1   | Address                                                    |
| --- | ---------------------------------------------------------- |
| 2   | Analyte (Derived Sample)                                   |
| 24  | Standard step (not indexing—ie, not Add Labels or Pooling) |
| 27  | Container                                                  |
| 40  | File                                                       |
| 92  | ResultFile (artifact), both per-sample and step-level      |
| 120 | Reagent type                                               |
| 122 | Pooling step                                               |
| 151 | Indexing step (ie, Add Labels)                             |
| 152 | Reagent label                                              |

**NOTE**: QC steps do not have a special LIMS ID prefix.

In addition, there are also some esoteric and deprecated LIMS ID prefixes. The complete list of prefixes can be found in the **classindex** database table.

### Translating a Step in the Web Interface to a Step URI in the API <a href="#h_64c7e533-63a7-4f05-a14d-487dcd2f3c17" id="h_64c7e533-63a7-4f05-a14d-487dcd2f3c17"></a>

Assuming you have a started a step, your browser address will look something like this:

<https://demo.claritylims.com/clarity/work-placement/> **21816**

The important piece is the suffix - 21816.

**To convert to a step URI:**

1. Note the type of step you are running. Is it a Standard step, an Indexing (Add Labels) step, or a Pooling step?
2. Add the corresponding hyphenated prefix using the previous list, to construct the step ID. For example, if it is an Indexing step, 21816 becomes 151-21816.
3. Build the step URI: https\://*hostname*/api/*version*/steps/**151-21816**.

### Translating a Step URI in the API to a Step in the Web Interface <a href="#h_cff9139b-2e67-4250-aa28-847424d979f2" id="h_cff9139b-2e67-4250-aa28-847424d979f2"></a>

To perform the reverse action and find a step in the web interface for a given a step URI (or a process URI):

1. Get the step ID. Using the example above, the step ID would be 151-21816.
2. Strip out the hyphenated prefix to give: '21816'.
3. Build the web address: https\://*hostname*/clarity/***work***/**21816**.

Clarity LIMS will translate the word 'work' to the correct address for the screen the step is currently on. For example, if the step is completed, 'work' will become 'work-complete'.