> For the complete documentation index, see [llms.txt](https://docs.celly.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.celly.ai/supported-tests/blood-wbc-differential/blood-wbc-differential.md).

# CBC manual

Preparation 

Put the sample, turn on the light, use 100x immersion objective magnification, and set the lens focus. Move the field of view to the  monolayer of cells.

#### Test execution

Open the test **configuration panel** (left bottom corner). Set **Test type = Blood: CBC.** Tap the main screen to return.

<figure><img src="https://357738419-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MJNQBgYLwFTXBIbt1TJ%2Fuploads%2FgX8vupEQ9ntDsxVatWrp%2F%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%202023-03-24%20%D0%B2%2017.40.00.png?alt=media&amp;token=a601fb71-d669-4f64-a1ef-54598ce79758" alt=""><figcaption></figcaption></figure>

Let's check the **app settings** - push the **gear icon** in the right bottom corner to open the menu. Set Sensitivity in range 60-80%. Leave the other settings as they are.&#x20;

<figure><img src="https://357738419-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MJNQBgYLwFTXBIbt1TJ%2Fuploads%2F97QprimZEFQJSpomDPtp%2F%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%202023-03-24%20%D0%B2%2017.45.50.png?alt=media&amp;token=7f87c150-6993-4114-9072-69f2f73d8f08" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
At the first launch, the app will ask you to calibrate color. Move the field of view over an empty area and press Ok
{% endhint %}

Start your test using the **Red Record Button** :red\_circle: Move your slide, controlling the focus. The app will automatically detect and count white blood cells. Finish your test (Stop button -> Complete) or the app will complete the test automatically (when reach configured number of Cells).

![Celly automatically detects and counts white blood cells](https://357738419-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJNQBgYLwFTXBIbt1TJ%2F-MMVY8OLLlx0BS9vZjfE%2F-MMVYqiJ19MouConmPey%2Fimage.png?alt=media\&token=892eb02d-4516-4914-b52a-537c1bbea118)

{% hint style="info" %}
If a cell was not detected, hold it with your finger for a few seconds
{% endhint %}

The test will automatically finished when you achieve configured number of cells.&#x20;