What It Measures
This test measures the concentration of iron circulating in your bloodstream, primarily bound to the transport protein transferrin. It reflects recent iron intake and availability rather than total body iron stores, which is why it is typically interpreted alongside ferritin, TIBC, and transferrin saturation for a complete picture.
Serum iron measures the amount of circulating iron in the blood, most of which is bound to transferrin. Iron is essential for oxygen transport via hemoglobin, energy production in mitochondria, and numerous enzymatic reactions. Both deficiency and excess carry significant health risks, making it a critical biomarker for overall health assessment.
Current Value
What High Means
Elevated serum iron may indicate hemochromatosis (hereditary iron overload), excessive iron supplementation, frequent blood transfusions, liver damage (releasing stored iron), or acute iron poisoning. Chronic iron overload generates reactive oxygen species through the Fenton reaction, causing oxidative damage to the liver, heart, pancreas, and joints. It is also associated with increased cardiovascular risk, insulin resistance, and elevated cancer risk due to iron's pro-oxidant effects.
Possible Symptoms
Joint pain, abdominal pain, fatigue, skin bronzing or hyperpigmentation, liver enlargement, irregular heartbeat, erectile dysfunction, loss of libido, brain fog, increased thirst and urination (if pancreas affected)
What Low Means
Low serum iron typically indicates iron deficiency, which can result from inadequate dietary intake, malabsorption (celiac disease, IBD, low stomach acid), chronic blood loss (menstruation, GI bleeding), or increased demand (pregnancy, intense exercise). Iron deficiency impairs oxygen delivery, reduces energy production, and compromises immune function. It is the most common nutritional deficiency worldwide and the leading cause of anemia.
Possible Symptoms
Fatigue and weakness, pale skin, shortness of breath, dizziness, cold hands and feet, brittle nails (koilonychia/spoon nails), restless legs, headaches, poor concentration, pica (craving non-food items like ice), hair loss, frequent infections, tongue soreness
Risk Factors
Iron deficiency anemia, hemochromatosis, chronic fatigue, restless leg syndrome, cardiovascular disease (with overload), liver cirrhosis, type 2 diabetes (with overload), neurodegenerative diseases (with overload), impaired immune function, hypothyroidism, hair loss, cognitive impairment, increased infection susceptibility
Actionable Advice
Supplements
- •Iron bisglycinate
- •Heme iron polypeptide
- •Vitamin C (enhances absorption)
- •Lactoferrin
- •Liver capsules (desiccated)
- •Cooking in cast iron cookware
Diet & Lifestyle
- •Pair iron-rich foods with vitamin C sources (citrus, bell peppers) to enhance absorption
- •Avoid drinking coffee or tea within 1 hour of iron-rich meals as tannins and polyphenols inhibit absorption
- •Separate calcium supplements and dairy from iron-rich meals by at least 2 hours
- •Include heme iron sources (red meat, organ meats, shellfish) which are 2-3x better absorbed than plant sources
- •If iron is high, consider regular blood donation to reduce iron stores
- •Soak, sprout, or ferment grains and legumes to reduce phytates that block iron absorption
- •Get tested in the morning fasting for most accurate results
- •For menstruating women, monitor iron more frequently especially with heavy periods
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Historical Trend
Related Biomarkers
Resources & Studies
All Readings
| Date | Value | Change |
|---|---|---|
| 2026-01-28 | 51 mcg/dL | +6.0 |
| 2025-08-25 | 45 mcg/dL | — |