⚠️
What Is Ferritin and Why Is Low Ferritin a Problem?
Your iron levels might be 'normal' while your ferritin is so low your hair is falling out.
Search for categories, articles, and products
Independent research on health testing & biomarkers — what's safe, what's not, and what to buy.
16 topics
Your iron levels might be 'normal' while your ferritin is so low your hair is falling out.
Standard lab ranges say you're fine at 30 ng/mL, but optimal health requires much higher levels.
Your HbA1c reveals your 90-day blood sugar average, but the conventional 'normal' range of 5.7% might already be too high.
A normal cholesterol test won't catch hidden heart disease—but this specific inflammation marker might.
Elevated homocysteine is a stealthy blood marker that damages blood vessels and doubles your risk of Alzheimer's—yet it's rarely checked at an annual physical.
Your fasting insulin can quietly creep up decades before your blood sugar looks abnormal on a standard lab test.
A Complete Blood Count (CBC) is the ultimate inventory check for your body, measuring the exact cells responsible for your immunity, oxygen, and healing.
Explains what a CMP tests (kidney, liver, electrolytes, blood sugar) and what abnormal results mean.
Your annual physical is missing five critical blood markers that detect disease years before you feel sick.
Your doctor’s basic blood panel is missing the early warning signs for metabolic dysfunction, thyroid issues, and heart disease.
Your lab results might be 'normal,' but that doesn't mean your hormones are balanced.
TSH is the brain's signal, T4 is the storage supply, and T3 is the active energy engine—and most doctors only test one of them.
If your doctor only checked your TSH and told you your thyroid is 'normal,' they missed the majority of the picture.
Once a year is the baseline, but if you're actively trying to fix a deficiency, you're flying blind without quarterly testing.
Function Health tests over 100 advanced biomarkers for $365 a year, making it the most cost-effective way to track your metabolic and hormonal health.
You no longer need a doctor's permission or a fight with insurance to get comprehensive blood work—but choosing the wrong service can cost you hundreds in hidden fees.