Chronic Fatigue Vitamin Differential & Lab Triage Workbench

1. Patient Baseline & Exposures

Representative Preset Active

Midday Sun Exposure (Minutes/Day): 15 mins

0m (Fully Indoors) ≥ 30m Recommended

Dietary Pattern:

Nightly Sleep Duration (Hours): 8.5 hrs

Sleep Architecture / Restoration:

Discriminative Clinical Symptoms (Check all that apply):

Brain fog / Cognitive sluggishness Proximal muscle weakness & bone ache Paresthesia (pins & needles in feet/hands) Brittle spoon nails / Restless legs Severe cold intolerance & dry skin Afternoon glycemic crashes & shakiness

2. Clinical Differential & Diagnostic Radar

High Vitamin D & B12 Probability

Differential Highlight: Vitamin D Index: 85% (High) · Vitamin B12: 68% (Moderate)

Target Etiology	Probability	Primary Clinical Lab Biomarker	Action Tier

Epidemiological Reality: The "80% Tiredness" Viral Claim

Viral internet posts claim "one single vitamin is making 80% of people exhausted." Epidemiological studies (e.g., NHANES) indicate that while 42% of U.S. adults are Vitamin D insufficient (<20 ng/mL) and vegetarians face up to 60% subclinical B12 depletion, true chronic exhaustion is rarely solved by single high-dose multivitamins. Clinicians evaluate multi-causal overlap—specifically ruling out unrefreshing sleep (sleep apnea) and thyroid hypofunction before assuming fatigue is purely nutritional.

Doctor Consultation & Lab Requisition Brief: