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Calcium test: what it can tell you about your health
Calcium is more than just a building block for bones and teeth. It is critical for muscle contraction, heart rate regulation, nerve impulse transmission, blood clotting, and hormonal activity. Despite its wide-ranging importance, calcium metabolism disorders can go unnoticed for a long time. That's why calcium test — is an important tool for detecting non-obvious, but potentially serious malfunctions in the body.
Why is a calcium test prescribed?
This test allows you to detect not only a deficiency or excess of calcium, but also to assess overall mineral metabolism. It may be prescribed for the following reasons:
prolonged muscle spasms or cramps
changes in heart function (arrhythmia, tachycardia)
frequent fractures or suspected low bone density
nervous system disorders (numbness, tingling, unsteady gait)
kidney, thyroid, or parathyroid disease
monitoring calcium levels in patients receiving vitamin D, calcium supplements, or anticonvulsant medications
assessment of electrolyte balance in chronic diseases
What is the peculiarity of calcium metabolism?
Only about 1% of calcium circulates in the blood, and it is divided into:
ionized calcium — active form that directly participates in physiological processes
bound calcium — in complex with proteins (mainly albumin)
calcium in the form of salts — in combination with phosphates, citrates
Therefore, sometimes, to get a complete picture, the doctor prescribes several tests at once: total calcium, ionized calcium, and also checks the level albumin й phosphorus.
Clinical significance of changes in calcium levels
| Body condition | Consequences | Possible causes |
|---|---|---|
| Hypocalcemia (↓) | Cramps, tingling, blood pressure instability, brittle nails, irritability | Vitamin D deficiency, hypoparathyroidism, intestinal malabsorption |
| Hypercalcemia (↑) | Weakness, thirst, nausea, bone pain, frequent urination | Hyperparathyroidism, malignant tumors, vitamin D or calcium overdose |
How to prepare for the analysis
Donate blood on an empty stomach (at least 8 hours without food)
The day before the study do not consume alcohol, fatty foods, calcium supplements
If possible, stop taking medications that may affect the result (after consulting with your doctor)
The sample is taken from a vein, and the result is usually ready within 1 business day.
What can affect the result?
Blood protein level (especially albumin)
pH level — in alkalosis, ionized calcium may be low
Taking medications: thiazide diuretics, lithium, anticonvulsants, vitamins
Patient's physical condition — dehydration, prolonged fasting or intense physical exertion
In which cases is the analysis especially important?
After fractures, especially in the elderly
In women during menopause — for early detection of osteopenia
Patients with chronic renal failure — due to impaired calcium-phosphorus metabolism
People who take corticosteroids for a long time
In children — if rickets, growth retardation or convulsive states are suspected
Food as a source of calcium
Calcium enters the body with food, but its absorption depends on many factors. The daily requirement for an adult is 800–1200 mg.
| Product | Calcium (mg/100 g) |
|---|---|
| Hard cheese | 700–1000 |
| Sesame seeds | 975 |
| Sardines with bones | 380 |
| Boiled white beans | 160 |
| Spinach | 99 |
| Poppy | 1440 |
Calcium absorption is promoted by vitamin D, lactose, magnesium, but they interfere oxalic acid, caffeine, phosphates from carbonated drinks.
A calcium test is a basic but extremely informative test. It not only helps to detect hidden disorders, but also prevents serious complications. If you have characteristic symptoms or risk factors, do not postpone the test.
