The Solsten SARS-CoV-2 Antigen ELISA Kit is a CE-marked in vitro diagnostic product with unique characteristics:

  • It quantifies the nucleocapsid protein antigen of SARS-CoV-2 in blood samples
  • It demonstrates COVID-19 at the same early stage of infection as PCR-analysis
  • It has an accuracy, specificity and sensitivity at the level of PCR-analysis of throat swabs


These characteristics makes the Solsten SARS-CoV-2 Antigen ELISA Kit particularly suitable for:

Screening for SARS-CoV-2 hospital (nosocomial) infections, since:

  • The blood samples have already been collected for other analytical purposes
  • Additional sampling by staff is avoided.
  • One technician can analyse several hundred blood samples by ELISA in one batch.
  • The analysis time of the ELISA is 2 hours per batch, and it is easy to automate.
  • The price of ELISA-screening is at least 4x lower per patient than testing by PCR.

Sensitivity, Specificity and Pos./Neg. Predictive Values (PPV/NPV) vs PCR:


604 patients:


PCR-tested patientsPredicted (%)


Neg15461476 96.8
Sensitivity (%)89.4    
Specificity (%) 99.8   



Accuracy: ELISA AUC=0,986 vs PCR.