Case Report
A Reversible Cause of Skin Hyperpigmentation and Postural Hypotension
Table 1
Summary of patient’s laboratory results.
| Investigation | Pretreatment | Posttreatment | Reference range* |
| Hemoglobin (gm/dL) | 10.9 | 10.8 | 12–16 gm/dL | Hematocrit % | 31.6 | 31.1 | 43.3%–46.6% | Mean corpuscular volume: MCV (fL) | 113 | 86.4 | 80–100 fL | Serum vitamin B12 (pg/mL) | 67 | 412 | 200–950 pg/mL | Thyroid-stimulating hormone: TSH (milli-int units/L) | 1.36 | | 0.4–4.0 mIU/L | Free thyroxine (microgm/dL) | 1.47 | | 0.7–2.0 mcg/dL | Plasma morning cortisol (microgm/dL) | 7.1 | | | Post-adrenocorticotropic hormone (ACTH) plasma cortisol (microgm/dL) | 27.3 | | Normal > 18 |
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Reference values are affected by multiple variables, including patient population and laboratory method used.
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