Only a blood test can detect vitamin D deficiency . It is impossible to determine the level of this nutrient "by eye" or by general well-being. The body does not give serious alarm signals, since vitamin deficiency is asymptomatic. If symptoms are present, it is quite difficult to find out their cause due to non-specificity. Constant fatigue, weakness, irritability, frequent colds, brittle hair and nails are usually attributed to stress or lack of sleep. At the same time, a lack of vitamin D negatively affects immunity, bone strength, energy level and psycho-emotional state.
25-OH vitamin D: what is the number on the analysis form?
Vitamin D obtained from the sun or food undergoes a complex transformation in the liver, resulting in the formation of the compound “25-OH vitamin D” or “25-hydroxyvitamin D”. This is the main transport form of vitamin D that circulates in the blood. It is this that is indicated in the results of laboratory tests . This compound has a fairly long half-life (about 2–3 weeks), due to which it most accurately reflects the actual reserves of vitamin D in the body. The active form of vitamin D (1,25-dihydroxyvitamin D) is formed later, in the kidneys, does not remain in the blood for long and fluctuates greatly depending on other factors, so it is not suitable for assessing the body's supply.
Norms for children, adults and pregnant women: where is the line between deficiency and norm?
In laboratories, test results can be reported in two units: ng/mL (nanograms per milliliter) or nmol/L (nanomoles per liter). To convert to nmol/L, multiply ng/mL by 2.5. To convert to ng/mL, divide nmol/L by 2.5.
| ng/ml | nmol/l | |
|---|---|---|
| Deficit | below 20 | below 50 |
| Insufficiency | 20-29 | 50-75 |
| Norm | 30-100 | 75-250 |
| Excess | above 100 | above 250 |
Important! For 25-OH vitamin D, the norm depends on age and physiological characteristics of the body:
Infants. During this period, the skeleton is actively forming, so even a slight deficiency of vitamin D in a child significantly increases the risk of developing rickets and impaired tooth growth. The optimal level is considered to be 40–60 ng/ml. Pediatricians usually prescribe preventive intake of the nutrient to infants.
Children under 5 years of age. The risk of deficiency is increased due to rapid growth and limited exposure to the sun (especially in winter), which negatively affects the condition of the musculoskeletal system.
Adolescence. This is a period of active growth and hormonal changes, resulting in an increased need for calcium and vitamin D. Vitamin deficiency often manifests itself in chronic fatigue and skin problems.
Pregnant women. The need for vitamin D increases, as it is necessary not only for the expectant mother, but also for the fetus for the formation of the skeleton and immune system. Therefore, it is important to monitor the level of the nutrient and respond immediately if it drops below 30 ng/ml.
Vitamin D deficiency often has no specific symptoms, so you shouldn't rely solely on how you feel. The most reliable way to assess your body's supply is to measure the level of 25-OH vitamin D in the blood and interpret the result together with your doctor.
My level is below normal - what to do next
If the analysis showed a deficiency or insufficiency of the vitamin, do not panic and try to solve the problem yourself, focusing on the dosage from the Internet or the packaging in the pharmacy. The specific dose, duration of administration and form of the drug should be selected by a doctor, as they depend on age, degree of deficiency, concomitant diseases and other individual factors.
It is important to clearly follow the specified algorithm:
Consultation with a doctor. A therapist , endocrinologist, or pediatrician evaluates the results of the analysis, taking into account age, weight, general health, chronic diseases, and concomitant complaints.
Selection of the form of the drug. Vitamin D is available in the form of drops, capsules, and tablets - the choice of form depends on age, condition of the gastrointestinal tract, ease of administration, and individual tolerance.
Dosage. Therapeutic doses differ significantly from prophylactic doses and are determined by the doctor individually.
Taking the course. It is important to strictly adhere to the prescribed regimen.
Monitoring. After 2-3 months, a blood test is repeated to assess how the body is responding to therapy and adjust the dose if necessary.
Can You Have Too Much Vitamin D: When to Stop?
Vitamin D is fat-soluble. Unlike water-soluble nutrients, which are quickly excreted from the body, it accumulates in tissues, which can lead to intoxication. Overdose most often occurs if a person takes high doses “as a backup”, without tests and medical supervision.
Symptoms of too much vitamin D (hypervitaminosis) may include nausea, vomiting, loss of appetite, weakness, increased thirst, frequent urination, muscle weakness, and joint pain. In severe cases, kidney failure may occur. Therefore, you should not take vitamin D for prevention without consulting your doctor.
You can take a vitamin D test in Kharkiv at the Mamyn Dim polyclinic. Based on the results, the doctor will give an accurate answer to the question: is there a deficiency, how pronounced is it, how to increase vitamin D, and what dosage is needed for you. A timely analysis will help you choose the right dose that will support your immunity and energy without posing a threat to the body.