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Physicians may order more diagnostic tests than necessary primarily due to the concern of potentially missing a diagnosis and facing malpractice lawsuits. This fear is rooted in the high stakes associated with healthcare; a missed diagnosis, particularly in serious conditions, can lead to detrimental outcomes for patients and significant legal repercussions for healthcare providers. As a result, some physicians adopt a more cautious approach, opting for additional tests as a means of safeguarding against any omissions in their assessments. This practice is often referred to as "defensive medicine," where the fear of litigation inadvertently influences medical decision-making, leading to an increase in the number of diagnostic tests ordered.

While ensuring a comprehensive diagnosis, increasing hospital revenue, and following professional guidelines may also play roles in the decision-making process, they are not as compelling as the concern for malpractice fears that can drive physicians to order extra tests.