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Serum Zinc Analysis – Measuring Zinc Levels in Blood
Serum zinc analysis is a blood test used to measure zinc levels in the serum. It helps diagnose zinc deficiency or zinc toxicity and is essential for assessing zinc metabolism.
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Serum zinc analysis is a blood test used to measure zinc levels in the serum. It helps diagnose zinc deficiency or zinc toxicity and is essential for assessing zinc metabolism.
What is Serum Zinc Analysis?
Serum zinc analysis is a laboratory diagnostic procedure that measures the concentration of zinc in the blood serum. Zinc is an essential trace element that supports numerous bodily functions, including immune defense, wound healing, cell metabolism, and the activity of many enzymes and hormones. The test is performed when zinc deficiency or zinc toxicity is suspected, or when at-risk individuals require routine monitoring.
How Does the Test Work?
A venous blood sample is drawn for serum zinc analysis, ideally in the morning and in a fasted state, as zinc concentrations in the blood can fluctuate depending on the time of day and recent food intake. The serum is then analyzed in the laboratory using atomic absorption spectrometry (AAS) or inductively coupled plasma mass spectrometry (ICP-MS). These methods enable precise measurement of zinc concentrations at the nanomolar or microgram level.
Reference Values and Interpretation
In adults, normal serum zinc levels are generally between 70 and 120 µg/dL (approximately 10.7–18.4 µmol/L), although exact reference ranges may vary slightly between laboratories. Results should always be interpreted in clinical context:
- Low (<70 µg/dL): Indicates zinc deficiency; possible causes include inadequate dietary intake, malabsorption, chronic illness, or increased demand.
- Normal (70–120 µg/dL): No abnormalities in zinc metabolism.
- Elevated (>120 µg/dL): May indicate zinc toxicity, for example due to excessive supplementation or occupational exposure.
When is Serum Zinc Analysis Used?
The test is ordered in a variety of clinical situations:
- Suspected zinc deficiency presenting with symptoms such as recurrent infections, growth retardation in children, skin changes, hair loss, loss of appetite, or impaired wound healing
- Monitoring of at-risk groups including older adults, pregnant or breastfeeding women, vegans, and individuals with chronic inflammatory bowel disease
- Follow-up during zinc supplementation therapy
- Suspected zinc toxicity or overdose from zinc supplements
- In patients with conditions such as liver cirrhosis, renal insufficiency, diabetes mellitus, or malabsorption syndromes
Limitations of the Test
Serum zinc analysis has several limitations that must be considered when interpreting results. Serum zinc levels can be affected by acute inflammation (acute-phase reaction), stress, recent meals, time of day, hemolysis of the blood sample, and certain medications. Since most of the body's zinc is stored intracellularly, serum values do not always accurately reflect total body zinc status. If there is a discrepancy between the laboratory value and the clinical picture, additional markers such as zinc in red blood cells (erythrocytes) or metallothionein may be used as complementary indicators.
Clinical Significance
Zinc is involved in more than 300 enzymatic reactions in the human body and plays a central role in immune function, DNA synthesis, growth, and reproduction. Regular monitoring of zinc status through serum zinc analysis is especially valuable in high-risk populations, enabling early detection and targeted treatment of zinc deficiency.
References
- World Health Organization (WHO): Zinc supplementation in the management of diarrhoea. WHO, Geneva, 2023. Available at: https://www.who.int
- Linus Pauling Institute, Oregon State University: Zinc. Micronutrient Information Center, 2023. Available at: https://lpi.oregonstate.edu/mic/minerals/zinc
- Maywald M, Wessels I, Rink L.: Zinc Signals and Immunity. International Journal of Molecular Sciences, 2017; 18(10):2222. DOI: 10.3390/ijms18102222
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