Context a clinician may consider
Blood and nutrient context
CBC, ferritin, B12, folate, and related tests can be relevant when the history suggests anemia, blood loss, or nutritional issues.
Hormonal and metabolic context
TSH, free T4, glucose, A1C, and selected hormones may be useful for specific symptoms and risk factors.
Sleep, mood, illness, and medicines
Normal lab tests do not exclude sleep disorders, stress, depression, post-infectious symptoms, pain, or medicine effects.
Questions that can make an appointment more useful
- What changed when the fatigue began?
- Which results are truly abnormal using this laboratory's units and ranges?
- Could sleep, mood, pain, infection, medicines, blood loss, or nutrition be contributing?
Translation with careful boundaries
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Common questions about fatigue
Can low ferritin cause fatigue before anemia?
Reduced iron stores can be relevant before hemoglobin falls, but fatigue is non-specific and other causes may coexist.
Does high TSH explain all fatigue?
No. A thyroid pattern may contribute, but free T4, symptoms, medicines, repeat results, and other causes need review.
What if the basic tests are normal?
Normal basic tests do not make fatigue insignificant. Sleep, mood, pain, medications, post-infectious illness, and other clinical factors may still need assessment.