To evaluate the usability and utility of the device, % agreement between the PID-RDT and the referent assay (serum/plasma), and % agreement between capillary blood and venous blood samples using the PID-RDT within confirmed PID patients prior to receipt of their monthly IV-Ig treatment.
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To evaluateusability among end users of the PID rapid screening tests using capillary blood samples obtained from PID patients, prior to receipt of IV-Ig treatment.
Timeframe: 3 month
To evaluate % agreement between the PID RDT(using capillary blood)and the referent test (serum/plasma).
Timeframe: 3 months