SERUM ZINC (By Photometry)
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Measures the concentration of zinc in the blood serum using photometric methods
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🧪 What is Serum Zinc Test (By Photometry)?
The Serum Zinc test measures the concentration of zinc in the blood serum using photometric methods, typically atomic absorption spectrometry or colorimetric photometry. Zinc is an essential trace element involved in numerous biological functions including immune response, wound healing, and enzymatic reactions.
❓ Why is the Test Done?
To:
- Diagnose zinc deficiency or excess
- Evaluate causes of growth retardation, immune dysfunction, or delayed wound healing
- Monitor zinc status in patients with malnutrition, chronic liver disease, renal disorders, or malabsorption syndromes
- Guide zinc supplementation therapy
📊 Normal Range
Serum Zinc Level | Reference Range |
|---|---|
Adults | 70 – 120 µg/dL (10.7 – 18.4 µmol/L) |
Normal ranges may vary slightly by laboratory and method.
📈 Interpretation of Results
Serum Zinc Level | Clinical Significance |
|---|---|
Low Zinc (<70 µg/dL) | Zinc deficiency – malnutrition, malabsorption, chronic illness |
Normal Zinc | Adequate zinc status |
High Zinc (>120 µg/dL) | Possible zinc toxicity or excess supplementation |
🧠 Associated Conditions
Condition | Details |
|---|---|
Zinc deficiency | Impaired immune function, growth failure, dermatitis |
Chronic liver or renal disease | Altered zinc metabolism |
Malabsorption syndromes | Celiac disease, Crohn’s disease |
Excess zinc intake | Gastrointestinal symptoms, copper deficiency |
🔄 Related / Follow-Up Tests
- Serum copper – to evaluate trace element balance
- Complete blood count (CBC) – assess anemia related to deficiencies
- Nutritional assessment
- Liver and renal function tests
✅ Fasting Required?
Test | Fasting Required |
|---|---|
Serum Zinc | ✅ Yes, 8-12 hours fasting recommended |
📝 Summary Table
Parameter | Details |
|---|---|
What | Measures zinc concentration in serum via photometry |
Why | Assess zinc deficiency or toxicity |
Normal Range | 70 – 120 µg/dL |
Low Levels | Zinc deficiency from malnutrition or illness |
High Levels | Zinc toxicity or supplementation excess |
Associated Conditions | Immune dysfunction, growth retardation, malabsorption |
Follow-up Tests | Serum copper, CBC, nutritional and organ function tests |
Fasting Required | ✅ Yes (8–12 hours fasting recommended) |
How our test process works!
