A sedimentation rate is performed by measuring the rate at which red blood cells (RBCs) settle in a test tube. The RBCs become sediment in the bottom of the test tube over time, leaving the blood serum visible above. The classic sedimentation rate is simply how far the top of the RBC layer has fallen (in millimeters) in one hour.
The scope of genealogy, however, goes well beyond family trees; extending into areas of law, technology, event planning and medicine. Hiring a genealogist can be costly, so you must conduct your own research before hiring someone to do research on your behalf.
There are also forestry consultants. I got my first start in forestry as an employee of a large consulting forestry firm who generally works for anyone needing forestry assistance. They do it all, either for a flat fee or a percentage of the sale of timber.