Are Your Labs "Normal" or Optimal?

Ever been told “your labs look fine”… but deep down you know something’s off?
That’s the gap between “normal” and optimal—and it’s where root cause medicine thrives.

Conventional medicine uses lab ranges to rule out disease.
Functional medicine uses them to reveal imbalance before it becomes disease.

If you’re stuck in the cycle of:

• Brain fog and bloating
• Mood swings or low libido
• Weight that won’t budge
• “Perfect labs” but zero answers...

...it’s time to stop guessing. Let’s decode what your labs are really saying—and how your body’s been waving red flags all along.

Conventional range: 20–50 ng/mL
Optimal range: 60–80 ng/mL

Vitamin D regulates over 200 genes—affecting your immune system, inflammation, hormones, and mental health.

Even “low-normal” levels are associated with:

• Depression
• Autoimmunity
• Insulin resistance
• Chronic pain

Study: Magnesium enhances vitamin D status

Conventional range: 1.5–2.6 mg/dL
Optimal range: 2.0–2.5 mg/dL

Magnesium powers over 300 enzyme reactions—including those for energy, digestion, and hormone balance.

Low magnesium is linked to:

• Constipation
• Anxiety
• Sleep disturbances
• Hormone detox issues

Yet serum tests often miss it, because most magnesium lives in your cells—not your blood.

Conventional range: 2.6–24.9 µIU/mL
Optimal range: 2–6 µIU/mL
(HOMA-IR under 1.5 is ideal)

Insulin is your fat storage hormone. High fasting insulin—even when glucose is normal—signals early metabolic dysfunction.

This is the trap where so many women gain belly fat, feel inflamed, and crash mid-afternoon—with “normal” A1C.

💡 This is one of the key markers explained inside the Core Health Toolkit—including how to calculate HOMA-IR from your own labs

TSH “normal” range: 0.5–4.5
Functional optimal range: 1.0–2.0
Add-ons you NEED: Free T3, Free T4, Reverse T3

If you’ve been told your thyroid is “fine” based only on TSH—run, don’t walk.
You need the full picture to detect:

• Slowed metabolism
• Hair thinning
• Cold hands & feet
• Low motivation

The Core Health Toolkit walks you through exactly what to ask for and how to interpret it.

CRP (hs-CRP) – signals inflammation

• Optimal: < 1.0 mg/L
• Elevated = chronic inflammation, even if you feel “fine”

Ferritin – storage form of iron

• Too low = fatigue
• Too high = inflammation, sluggish liver, oxidative stress
• Optimal = 50–80 ng/mL (not just >10!)

👉 Together, these two markers tell us whether your fatigue is from deficiency, overload, or inflammation—and they're often completely overlooked.

1. Functional Lab Ranges vs. Conventional – Kresser Institute
2. Magnesium and Vitamin D Synergy – AJCN
3. Why Serum Magnesium Misses Deficiency – Rupa Health
4. Insulin Resistance, Metabolism & HOMA-IR – NIH