Surround optical-fiber immunoassay
Surround optical-fiber immunoassay (SOFIA) is an ultrasensitive, in vitro diagnostic platform incorporating a surround optical-fiber assembly that captures fluorescence emissions from an entire sample. The technology's defining characteristics are its extremely high limit of detection, sensitivity, and dynamic range.
Source: Wikipedia — Surround optical-fiber immunoassay (CC BY-SA 4.0)