Complement C4 — lab reference
In the reference guideAsk your clinician to use performing-lab range and trend.
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What’s searchable?Ask your clinician to use performing-lab range and trend.
Ask your clinician to use performing-lab range and trend with C4/CH50 and disease activity.
Your lab may use its own range. Symptoms, medicines, and the types of white blood cells also matter.
Altitude, smoking, hydration, androgen therapy, and pregnancy may shift values.
Ask your clinician to consider altitude and iron/B12/folate status. Pregnancy requires trimester-specific ranges.
Hydration and altitude are major modifiers. Ask your clinician to review alongside hemoglobin and RBC indices.
Macrocytosis and microcytosis require cause-specific interpretation.
The test method matters. Ask your clinician to review with MCV and MCHC.
Analyzer-specific; hemolysis and cold agglutinins may interfere.
Useful with MCV for mixed nutrient deficiencies and evolving anemia.
Local analyzer range governs. Ask your clinician to review trends and collection artifacts.
Highly analyzer- and handling-specific. Ask your clinician to consider trend rather than isolated value.
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