Final answer:
The main advantage of conducting laboratory tests in a physician's office laboratory is the faster turnaround time for obtaining test results, enabling quicker diagnosis and treatments.
Step-by-step explanation:
The primary advantage of completing laboratory tests in the physician's office laboratory is a) Faster turnaround time. This benefit is significant because it allows for quick diagnostics and immediate patient management. Having an on-site laboratory means that tests can be processed and interpreted rapidly, often within the same visit, leading to quicker treatment decisions. While some might argue that in-house labs could potentially offer lower costs due to the elimination of third-party fees, the main advantage clearly rests with the immediacy of test results, which could be critical in acute care scenarios. On the other hand, greater test variety and higher test accuracy are not guaranteed in a physician's office lab as these are often related to larger, specialized facilities that can invest in a broader range of equipment and have staff specialized in various tests.