Chronic Fatigue Syndrome Practice Test 2025 - Free Practice Questions and Study Guide

Question: 1 / 400

How long must fatigue persist to consider a diagnosis of CFS?

At least one month

At least three months

At least six months

The correct duration for diagnosing Chronic Fatigue Syndrome (CFS) is six months. This timeframe is critical because it helps distinguish CFS from temporary fatigue or exhaustion that may occur due to other factors like stress, illness, or lifestyle changes. A persistent state of debilitating fatigue lasting at least six months, along with other specific symptoms, is essential for arriving at a diagnosis of CFS. The requirement for this duration emphasizes the chronic nature of the condition, as it manifests over an extended period, affecting a person's physical and mental health significantly. This standard helps healthcare professionals establish a clear diagnosis and exclude other conditions that may cause fatigue that is shorter in duration.

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At least twelve months

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