> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/technical-documentation/performance/linearity-across-dilutions.md).

# Linearity across dilutions

BactoBox® shows great linearity between cells/mL and the dilution factor. This linearity covers the entire range given by the [Limit of detection](/technical-documentation/performance/limit-of-detection.md).

The table below shows how BactoBox® performs across various particle types. Note that all R<sup>2</sup> values are very close to 1, which indicates strong linearity across the tested range.

| Particle type                | Tested range (1/mL) | Linearity with dilution factor |
| ---------------------------- | ------------------: | ------------------------------ |
| *Staphylococcus epidermidis* |    30 000–5 000 000 | R<sup>2</sup>=0.9975           |
| 1 µm silica microspheres     | 1 000 000–5 000 000 | R<sup>2</sup>=0.9995           |

The below figure illustrates the linearity for the *Staphylococcus epidermidis* linearity-response test.

<figure><img src="https://1559892669-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHvoombw1JBsKTJTfYyuJ%2Fuploads%2Fs4yaVgDoXouFcz1lVYn7%2FStaphEpi_linearity_DF.png?alt=media" alt=""><figcaption><p><em>S. epidermidis</em> linearity response. Concentration of cells for the same primary sample measured at different dilution factors. Each data point represents arithmetic mean of technical triplicates. Error bars represent standard deviation.</p></figcaption></figure>


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