Fourth State Systems

We are developing new technology for transcutaneous blood gas monitoring, that is measurements of the carbon dioxide and oxygen levels in the body through the skin. Such analysis is widely important in healthcare, and vital for modern neonatal care.


Problems to solve

Current transcutaneous blood gas monitoring requires heating of the skin above 42°C, which causes burns.

To avoid skin burns the equipment has to be moved in less than an hour, meaning that the monitoring cannot be performed continuously but rather intermittently.

Current methods are also rather slow, where one measurement takes more than 10 minutes, and, hence, risk missing rapid (acute) events.

Our Vision

Enabling reliable transcutaneous blood gas measurements without heating of the skin.

Offering truly continuous monitoring.

Reducing response times to cover acute events.

Extending the use of transcutaneous blood gas monitoring to children and adults.

Improve the quality of neonatal care.

Our solution

Use unique and patented technology that was initially developed for use in space exploration, and that can:

- Analyze much lower gas flows through the skin.
- Measure with higher resolution without heating.
- Measure continuously.
- Measure more than 10 times faster than current methods to detect emergencies.

Our Partners


We are actively seeking discussion and collaboration with all stakeholders in the field of transcutaneous blood gas monitoring, so please contact us with any questions, comments or ideas!


We really think that we are on to something that could have a great impact on transcutaneous blood gas monitoring, and we are hoping to make this journey together with partners from both industry and healthcare.

Anders Persson - CEO