Blood test for minerals: what indicators to check, how to prepare and what they mean

Minerals — are the basis of life processes in the body. They participate in the functioning of the heart, nervous system, muscles, bone formation, and even in the transmission of signals between cells.
A blood test for minerals allows you to assess the balance of these elements and timely detect a deficiency or excess. This article focuses on patients, who want to understand, how the test is performed, what it shows and how to decipher the results.

When to get a blood test for minerals

You should check your mineral levels if you notice:

• muscle spasms or cramps;

• weakness, fatigue, apathy;

• brittle nails, hair loss;

• frequent headaches, dizziness;

• heart rhythm disturbances;

• increased nervousness or insomnia;

• suspected anemia or osteoporosis.

The analysis is also recommended during pregnancy, during intensive training, during rehabilitation after illness, or with special diets (vegetarian, gluten-free, protein).

What minerals are tested?

How the research is conducted

1. Blood sampling from a vein — standard procedure.

2. Preparation:

   • do not eat for 8–12 hours before the analysis (water is allowed);

   • do not take vitamin complexes or mineral supplements for 2–3 days;

   • avoid physical activity and alcohol the day before.

3. Ready time — usually from 1 to 3 days.

During the study, atomic absorption spectrophotometry or ion-selective electrode methods are used, which allow determining the concentration of elements with high accuracy.

How to interpret the results

• Understated indicators indicate a mineral deficiency due to insufficient intake from food, loss from bleeding, or problems with absorption in the intestines.

• Increased indicators may indicate kidney or liver dysfunction, endocrine diseases, or excessive use of supplements.

Interpretation should always be done by a doctor. He evaluates not only laboratory data, but also the clinical picture, diet, medication intake, and accompanying tests (e.g., protein, ferritin, albumin).

What additional tests may be ordered?

• Ferritin analysis — shows iron reserves.

• Parathyroid hormone (PTH) — evaluates calcium regulation.

• Vitamin D — affects the absorption of calcium and phosphorus.

• Electrolytes (Na, K, Cl) — are important for fluid balance and heart function.

How to maintain mineral balance

• Eat foods rich in micronutrients: fish, eggs, dairy products, legumes, nuts, and greens.

• Combine them with sources of vitamin C (citrus fruits, sauerkraut) - this improves iron absorption.

• Limit excess coffee, black tea, and carbonated drinks — they reduce the absorption of minerals.

• Get regular laboratory tests, especially if you have chronic diseases or are on a diet.

Who is at risk?

• Women with heavy menstruation.

• Pregnant and nursing mothers.

• People with celiac disease, gastritis, colitis.

• Athletes.

• Teenagers during a period of active growth.

• Older people with limited nutrition.

Why is it important to do this analysis?

Mineral deficiency often has no obvious symptoms—the body simply gradually depletes itself. A timely blood test for minerals helps prevent anemia, osteoporosis, heart rhythm disorders, nervous disorders, and loss of energy.
Monitoring your micronutrients is a simple but effective way to take care of your health.

Sources

1. World Health Organization (WHO). Micronutrient deficiencies: global report, 2024.

2. Mayo Clinic. Mineral and electrolyte blood tests: overview and interpretation.

3. US Food and Drug Administration (FDA). Nutrient labeling and mineral intake guidelines, 2023.