> 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/advanced/advanced-sample-preparation/focus-on-target-objects.md).

# Focus on target objects

<figure><img src="/files/9TyYXLXO8KOMAQ6aSeih" alt="" width="375"><figcaption></figcaption></figure>

A sample may contain *background* particulates, by which we mean objects that are not the intended targets of analysis. For example, a growth medium may include dead cells and residual particulates derived from yeast extracts or similar components. Additional background particulates can originate from compounds added during the drying of bacterial products, such as osmoprotectants, excipients, and bulking agents. Biological matrices like stool and urine samples may also contain background particulates that are not the target objects.

Ensure that you are quantifying the intended target objects rather than background particulates originating from the sample matrix. Whenever possible, include bacteria-free controls to determine whether the background signal is negligible or whether a strategy is required to correct for or subtract background contributions.

In this step by step guide we will detail how to ensure accurate detection of target objects. We will do so by considering the background of various sources, primarily the growth medium. We will go through the below topics.

1. [Measure background particulates](/advanced/advanced-sample-preparation/focus-on-target-objects/measure-particulates-in-growth-medium.md)
2. [Is background substantial?](/advanced/advanced-sample-preparation/focus-on-target-objects/is-background-substantial.md)
3. [Mitigate high background](/advanced/advanced-sample-preparation/focus-on-target-objects/mitigate-high-background.md)

## Summary

After this brief introduction to the importance of checking the background, proceed to the first step: [Measure background particulates](/advanced/advanced-sample-preparation/focus-on-target-objects/measure-particulates-in-growth-medium.md)


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