Thyroperoxidase antibody (TPO Ab) — lab reference
Some search terms matchedAssay-specific. Positive result supports thyroid autoimmunity but does not determine treatment alone.
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What’s searchable?Assay-specific. Positive result supports thyroid autoimmunity but does not determine treatment alone.
Assay-specific. Also affects thyroglobulin tumor-marker interpretation.
Use the exact assay cutoff. Helpful in selected Graves disease questions.
Not a general thyroid wellness target. Use tumor follow-up, thyroid anatomy, and antibody status.
Morning fasting collection is preferred when practical. Day-to-day variation is substantial.
Interpret with iron, transferrin saturation, and ferritin.
Negative acute-phase reactant; affected by liver function and nutrition.
Calculated from iron and TIBC. Fasting and timing improve consistency.
Acute-phase reactant. Menstruation, menopause, inflammation, liver disease, and iron therapy matter.
<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.
<4.0 suggests deficiency. Recent intake or supplementation may raise serum values.
More specific for cellular B12 deficiency; kidney impairment can elevate.
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