Business Logo for AHA

The company name is Allied Health Assessments. The business is rehabilitation consultancy and medico legal assessment services. Words that describe the product include : expert comprehensive and objective opinions. The customer base is insurers (workers compensation, compulsory third party, income protection) employers and personal injury Iawyers. I would like the logo and brand design to be conservative, but modern and incorporate a dark charcoal grey, white (maybe for the text) and a bright yellow colour scheme. The yellow to represent the positive health and rehab aspect. Prefer to not use the image of people, workplaces (this has been done to excess) or stick figures in branding as this is often used to represent treatment providers such as physiotherapists. Medical symbol also not appropriate. Want something more symbolic, maybe circles and perhaps something that incorporates the initials AHA, with emphasis on the A. Font preference is basic sans serif or arual (saw these on dafont website) or a combination of these. For the business card I envision the front to be grey with the contact details and business name, and on the back, yellow with maybe circle links in contrasting grey and white with the logo design. Something along those lines..