# 我所购买的SBS试剂盒最多能够满足多少个循环的测序？

<br>

为上机测序提供足够量的SBS试剂是确保测序获得成功的重要因素之一。如果运行过程中试剂量不够，会导致荧光信号强度和测序质量值降低，甚至可能引起测序失败。双端测序在不同测序仪上有不同的操作流程，具体可以参照[Indexed Sequencing Overview Guide](https://emea.support.illumina.com/downloads/indexed-sequencing-overview-15057455.html)。在某些仪器上运行双端index测序时，还需要额外七个循环的试剂做第二个index测序前的化学合成反应（仅合成不拍照），此时计算试剂盒所能支持的测序循环数时，一定要考虑到这七个循环也要被包含在总循环数内。

下面表格列举出了多种试剂盒的规格及每种试剂盒最多支持的循环数，请将在某些仪器上运行双端index测序时额外的7个循环考虑在内:

![](/files/d653QNrNXOvzMzmXdiQ5)

\*The NextSeq 1000/2000  P3 300 cycle 试剂盒含有327个cycles. 其余试剂盒均额外含有38个cycles。

\*\*所有NextSeq 1000/2000 XLEAP 试剂盒均额外含有38个cycles。

关于每种测序试剂盒的详细信息请参阅对应的试剂支持页面，不同测序试剂盒支持的最长读长请参阅[Illumina 测序平台的最大读长](https://knowledge.illumina.com/instrumentation/general/instrumentation-general-reference_material-list/000007102)。

&#x20;

\
\
\ <br>

|                                                                                                                                                                                                                                                                                                                                                                        |
| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| *For any feedback or questions regarding this article (Illumina Knowledge Article #7400), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000007400%20-%20Instrumentation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://knowledge.illumina.com/instrumentation/general/instrumentation-general-reference_material-list/000007400.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.