Paid Research Studies PPA provides disease researchers with the biological specimens they need by compensating blood donors, patients and physicians for their help in participating in, or referring others to participate in, paid research studies. Through use of PPA's plasmapheresis center, physician networks, and expertise, PPA is able to provide disease researchers with precisely the patient specimens they require to achieve their disease research goals. All studies and products are FDA-regulated to ensure only the highest quality products, and HIPAA-compliant to ensure patient and blood donor personal information is protected.