Serum iron — lab reference
In the reference guideMorning fasting collection is preferred when practical. Day-to-day variation is substantial.
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What’s searchable?Morning fasting collection is preferred when practical. Day-to-day variation is substantial.
<4.0 suggests deficiency. Recent intake or supplementation may raise serum values.
Normal serum magnesium does not exclude tissue depletion.
Measured and calculated values may differ. Review osmolal gap when indicated.
Interpret with iron, transferrin saturation, and ferritin.
Fasting, time of day, inflammation, albumin, and trace-metal collection technique matter.
Estrogen, pregnancy, inflammation, liver function, and ceruloplasmin affect values.
Trace-metal collection and geographic/dietary context matter.
Collect at a defined time. Assay-specific; dynamic testing may be required.
Time-specific and assay-specific.
Consider altitude and iron/B12/folate status. Pregnancy requires trimester-specific ranges.
Serum chemistry value. Do not substitute arterial blood-gas bicarbonate ranges.
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