According to 2021 consensus recommendations, these routine diagnostic tests are recommended for all patients with suspected ME/CFS:
Complete blood count with differential
Comprehensive metabolic panel
Four-point salivary cortisol (eg, upon waking, at noon, at 4:00 PM, and at bedtime)
Thyroid-stimulating hormone, free thyroxine
Erythrocyte sedimentation rate
25-dihydroxy vitamin D
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Cite this: Michael Stuart Bronze. Fast Five Quiz: Chronic Fatigue Syndrome (Myalgic Encephalomyelitis) - Medscape - Jan 01, 2022.