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The Labs That Lied
12 min readarticle
Tamsin is sitting in an exam room. The fluorescent light hums. The paper on the table crinkles when she shifts. She has been here for eleven minutes and the doctor has been in the room for four of them. He has her lab results on the screen. CBC: normal. TSH: 3.4, within range. Ferritin: 18, within...
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In this lesson you will learn:
- Ferritin of 18 is 'lab normal' but functionally depleted — target is above 50 for symptom resolution
- TSH depends on which lab machine runs the test — a 40% variance exists between major assays
- The standard fatigue workup (CBC, BMP, TSH) misses iron deficiency without anemia, subclinical thyroid, and hormonal baseline
- +1 more takeaway
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