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Serum Zinc Level – Normal Values, Deficiency & Treatment

The serum zinc level measures the concentration of zinc in the blood serum and is used to diagnose zinc deficiency or zinc excess. It is a key laboratory parameter in nutritional and metabolic medicine.

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The serum zinc level measures the concentration of zinc in the blood serum and is used to diagnose zinc deficiency or zinc excess. It is a key laboratory parameter in nutritional and metabolic medicine.

What Is the Serum Zinc Level?

The serum zinc level is a laboratory value that measures the concentration of zinc in the blood serum. Zinc is an essential trace element that the human body cannot produce on its own and must therefore obtain through the diet. The serum zinc level serves as a diagnostic marker to assess whether the body has an adequate zinc supply.

Zinc plays numerous vital roles in the body: it is involved in the activity of more than 300 enzymes, supports the immune system, promotes wound healing, is essential for growth and development, and contributes to the health of skin, hair, and nails.

Reference Values for Serum Zinc

Normal values for serum zinc levels may vary slightly between laboratories. Generally accepted reference ranges are:

Adult males: 70–120 µg/dl (10.7–18.4 µmol/l)
Adult females: 65–110 µg/dl (9.9–16.8 µmol/l)
Children: 65–105 µg/dl (9.9–16.0 µmol/l)

Values below the reference range indicate zinc deficiency, while values above may point to zinc toxicity (zinc intoxication).

Causes of a Low Serum Zinc Level

A serum zinc level that is too low can have various causes:

Insufficient dietary zinc intake (e.g., vegan or vegetarian diet without adequate supplementation)
Increased zinc requirements (e.g., during pregnancy, breastfeeding, or growth phases)
Reduced intestinal absorption (e.g., in Crohn disease, celiac disease, or after gastric surgery)
Increased zinc loss (e.g., through chronic diarrhea, burns, or excessive sweating)
Liver diseases (e.g., liver cirrhosis)
Chronic conditions such as diabetes mellitus or renal insufficiency
Use of certain medications (e.g., diuretics, corticosteroids, proton pump inhibitors)

Causes of an Elevated Serum Zinc Level

An elevated serum zinc level is less common and usually occurs due to:

Excessive intake of zinc supplements or zinc-containing dietary supplements
Occupational or environmental zinc exposure
Certain metabolic disorders

Symptoms of Abnormal Zinc Levels

Symptoms of Zinc Deficiency

Weakened immune system and frequent infections
Delayed wound healing
Hair loss and brittle nails
Skin changes (e.g., eczema, dry skin)
Impaired sense of taste and smell
Growth delays in children
Fatigue and difficulty concentrating

Symptoms of Zinc Overdose

Nausea and vomiting
Abdominal cramps and diarrhea
Headaches
With chronic overdose: copper deficiency and neurological symptoms

Diagnosis and Test Procedure

The serum zinc level is measured through a simple blood draw. Since zinc is also found in platelets and red blood cells, blood must be collected under standardized conditions to avoid contamination and inaccurate results. Ideally, blood is drawn in the morning after fasting, as serum zinc levels are subject to daily fluctuations and can be influenced by meals.

It is important to note that the serum zinc level reflects only approximately 0.1% of total body zinc and therefore provides limited information about overall zinc status. When zinc deficiency is suspected, additional markers such as zinc levels in red blood cells or urine may be measured.

Treatment for Abnormal Zinc Levels

Treating Zinc Deficiency

When zinc deficiency is confirmed, dietary adjustments are the first step. Zinc-rich foods include:

Meat (especially beef and pork)
Seafood (especially oysters)
Legumes (lentils, chickpeas)
Nuts and seeds (pumpkin seeds, sunflower seeds)
Whole grain products
Dairy products and eggs

In cases of significant deficiency or impaired absorption, zinc supplements (e.g., zinc sulfate, zinc gluconate, zinc bisglycinate) may be prescribed. Dosage should always be managed by a healthcare professional to prevent overdose.

Treating Zinc Overdose

When elevated levels are caused by supplementation, zinc intake should be reduced or discontinued. In cases of acute poisoning, medical treatment is required.

References

World Health Organization (WHO): Trace Elements in Human Nutrition and Health. WHO Press, Geneva, 1996.
Wessels I, Maywald M, Rink L: Zinc as a Gatekeeper of Immune Function. Nutrients. 2017;9(12):1286. PubMed PMID: 29186856.
Hambidge KM, Krebs NF: Zinc Deficiency: A Special Challenge. Journal of Nutrition. 2007;137(4):1101–1105. PubMed PMID: 17374687.

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