Then, we showcase the potential for a portable point-of-care (POC) device, including a Si PIN photodiode in a custom-built fluorescence reader, which is designed to scan multiplexed SWCNT arrays in the shape of a barcode. Finally, we explore the capability of this combination of nanosensors and low-cost custom reader for levodopa sensing in human blood serum, which highlights the potential for POC Parkinson disease monitoring.