
laboratory experiments are the most heavily controlled form of experimental research. participants can also be randomly allocated to experimental conditions, to avoid experimenter bias (i.e. the experimenter cannot be accused of choosing who will be in each experimental condition, which could affect the results). - high control over extraneous,clinical laboratory fee schedule,jan 01, 2016 outpatient clinical laboratory services are paid based on a fee schedule in accordance with section 1833(h) of the social security act. payment is the lesser of the amount billed, the local fee for a geographic area, or a national limit. in accordance with the statute, the national limits are set at a percent of the median of all local fee