COMPENDIUM ON FUNCTIONAL MEDICINE - Flipbook - Page 113
Ferritin
15-150 ng/mL
(women)
40-90
ng/mL
Values from 15-40 may
indicate functional iron
deficiency [1,3]
Vitamin D
30-100 ng/mL
50-80
ng/mL
Values from 30-50 may be
insufficient for optimal
immune function [1,3]
By identifying biomarkers in these gray zones, practitioners can
implement targeted interventions before frank disease develops
[2,7,8].
Case Study: The Seemingly "Normal" Patient
Let's consider a hypothetical 39-year-old male patient presenting
with:
● Low energy and fatigue
● Weight gain, especially around the abdomen
● Decreased libido
● Frequent minor illnesses
● Muscle aches and pains
● Poor sleep quality
His conventional blood test shows nearly everything within normal
ranges, with only three values flagged as abnormal:
● Total bilirubin (slightly elevated)
● Direct bilirubin (slightly elevated)
● DHEA sulfate (slightly low)
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