Sequencing
CTG offers Sequencing-Only services for user-prepared libraries on the NovaSeq X Plus and NextSeq 2000 platforms.
This service is designed for users who prepare their own sequencing-ready libraries and only require access to our Illumina instruments.
What’s Included
✔ Use of the selected Illumina sequencer
✔ Required sequencing reagents
✔ Instrument handling by CTG staff
✔ Storage of data for 1 month after delivery
What’s Not Included
✘ Library preparation or pooling
✘ Support for SampleSheet creation
✘ Optimization of loading concentration or run parameters
✘ Troubleshooting of failed or suboptimal runs
The customer is responsible for
> Accurate SampleSheet information for requested sequencer
> Correct library quantification, dilution and pooling
Important Notes
• CTG does not guarantee run performance for Sequencing-Only projects.
• CTG cannot assist with issues related to pooling or incorrect SampleSheet entries.
• Follow the guidance provided by your library prep kit manufacturer.
• For questions about sequencing specifications and loading recommendations, contact Illumina Technical Support.
Data Handling & Retention
🗃️ Sequencing data will be stored for 1 month after delivery and then permanently deleted.
💾 Please ensure your data is backed up—we strongly recommend keeping at least two copies.
❗ CTG is not responsible for lost or corrupted data after delivery.
Available Flowcells
100, 200 and 300 cycle sequencing kits are available for all flowcells.
~ 50 cycle sequencing kits available
* 600 cycle sequencing kits available
Sequencer: | Flowcell name | Single-end reads (millions) | Single-end reads (billions) | Approx SEK / million bp for 300 cycle kit |
NovaSeq X Plus | 25 B | 25 000 | 25 | 10 |
NovaSeq X Plus | 10 B | 10 000 | 10 | 15 |
NovaSeq X Plus | 1.5 B | 1 500 | 1.5 | 27 |
NextSeq2000 | P4~ | 1 800 | 1.8 | 44 |
NextSeq2000 | P3 | 1 200 | 1.2 | 50 |
NextSeq2000 | P2* | 400 | 0.4 | 94 |
NextSeq2000 | P1* | 100 | 0.1 | 136 |

NovaSeq X Plus Flowcells
High-throughput sequencing for most cost-effective sequencing
1.5 billion to 25 billion clusters per flowcell

NextSeq 2000 Flowcells
Mid-throughput sequencing for maximum flexibility
100 million to 1.8 billion clusters per flowcell