Laboratory medicine subject-based

There are a number of disciplines in addition to geochemistry where judgment guided by experience is required to reach the desired objective. These include medicine, where a diagnosis of the cause of an illness may be based on a physician s subjective evaluation of symptoms as well as on the objective results of laboratory tests. Likewise, in economic geology, a decision of where to drill for mineral deposits depends on the skill of the exploration geologist as well as on data from cores and seismic lines, and on structural, sedimentologic or tectonic conceptual models. 

Medical devices are always tested for medianical and/or electrical safety before they are used on/in people, but, utilike medicines, they are not automatically subject to a clinical trial This is because it is often imjHactical and utmecessary to test diem in this way and safety and poformance can be based on laboratory tests. Whether a device is subject to a clinical trial or not depoids on the type of device, its intended use, and how newVdifferent it is. Clinical trials are phased and may take sevoal years to complete. 

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