Is hsCRP useful for fatigue?

Whether hsCRP (high-sensitivity C-reactive protein) is useful for fatigue cannot be directly answered from the provided contexts, as none address hsCRP or fatigue. hsCRP is a well-established but non-specific marker of systemic inflammation. Chronically elevated levels may indicate underlying inflammation, which can contribute to fatigue in conditions like autoimmune diseases, chronic infections, or metabolic disorders. However, fatigue is a highly heterogeneous symptom with numerous causes (sleep deprivation, stress, depression, nutrient deficiencies, thyroid dysfunction, medications, etc.). The sole hsCRP value is neither diagnostic nor specific for fatigue. In clinical practice, hsCRP is sometimes used as part of a basic workup when an inflammatory etiology is suspected. The evidence for routine use in fatigue without additional symptoms is weak and rests mainly on mechanistic reasoning and association studies. A normal hsCRP does not rule out inflammatory causes, and an elevated level requires further investigation. For consumers: a standalone DNA test or home hsCRP test provides no clear action plan; interpretation must be in a clinical context. Evidence: mechanistic; no direct interventional trials from the given material.