--- title: Technology description: Technology --- [Skip to content](https://resources.cnside-dx.com/technology#main-content) English Show submenu for translations [![CNSide-logo-RGB](https://resources.cnside-dx.com/hubfs/CNSide-logo-RGB.svg)](https://cnside-dx.com) - [Leptomeningeal Metastases](https://cnside-dx.com/about-leptomeningeal-metastases/) - [CNSide® CSF Assay](https://cnside-dx.com/cnside-csf-assay/) - [News & FAQs](https://cnside-dx.com/news/) - [Company](https://cnside-dx.com/about/) - [Contact Us](https://cnside-dx.com/contact-us/) Open main navigation Close main navigation - [Leptomeningeal Metastases](https://cnside-dx.com/about-leptomeningeal-metastases/) - [CNSide® CSF Assay](https://cnside-dx.com/cnside-csf-assay/) - [News & FAQs](https://cnside-dx.com/news/) - [Company](https://cnside-dx.com/about/) - [Contact Us](https://cnside-dx.com/contact-us/) - English Show submenu for translations - Order a Test Order a Test How can we help you? - There are no suggestions because the search field is empty. 1. [Resources](https://resources.cnside-dx.com/?hsLang=en) 2. [FAQs](https://resources.cnside-dx.com/faqs?hsLang=en) # Technology - **CEE-Sure™ Preservation Tubes**  CEE-Sure tubes contain a proprietary preservative that ensures the CSF samples are stabilized at room temperature as well as maintains the integrity of the tumor cells for analysis once at the CNSide lab. These are supplied by our lab as part of a kit provided at no charge. [You can learn more about the CEE-Sure technology here. ](https://resources.cnside-dx.com/cnside-dx.com/cee-sure?hsLang=en) - **CSF Volume**   We request a minimum of 2ml of CSF. If the tumor cell count in a patient is very low, collecting a reduced volume of CSF may increase the likelihood of a false negative (e.g, if the true count is 1 tumor cell per ml and we only receive 0.5ml of CSF, we might not detect it). - **Sample Stability**   CSF samples immediately transferred after sample acquisition into a CEE-Sure CSF Collection Tube remain stable for up to 96 hours - [FAQs](https://resources.cnside-dx.com/faqs?hsLang=en) - [Leptomeningeal Metastases](https://cnside-dx.com/about-leptomeningeal-metastases/) - [CNSide® CSF Assay](https://cnside-dx.com/cnside-csf-assay/) - [News & FAQs](https://cnside-dx.com/news/) - [Company](https://cnside-dx.com/about/) - [Contact Us](https://cnside-dx.com/contact-us/) [![CNSide-logo-RGB](https://resources.cnside-dx.com/hubfs/CNSide-logo-RGB.svg "CNSide-logo-RGB")](https://cnside-dx.com)   © 2026 CNSide Diagnostics, LLC is a subsidiary of Plus Therapeutics, Inc. CNSide is a trademark of CNSide Diagnostics, LLC. All rights reserved. The intended use of this test is to establish the presence and quantity of tumor cells in cerebrospinal fluid specimens of patients with Leptomeningeal Disease. This test was developed and its performance characteristics determined by CNSide Diagnostics LLC. It has not been cleared or approved by the FDA. This test is used for clinical purposes and should not be regarded as investigational or for research. CNSide Diagnostics laboratory is certified under the Clinical Laboratory Improvement Amendments (CLIA) as qualified to perform high complexity clinical laboratory testing.