The number of medical surveys you can participate in monthly will depend on your specialty and experience. Medical survey companies will pair you with surveys that they have that match your experience and specialty.  Specialties that conduct extensive medical research will receive significantly more survey opportunities than specialties that don’t. For example, oncology neurology, rheumatology, cardiology, gastroenterology, and pulmonology are specialties that perform frequent market research, and thus experience a higher medical survey demand.