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Diagnosis of iron deficiency: how to detect deficiency in time and prevent anemia
Iron — one of the most important trace elements in the body. It is a part of hemoglobin, participates in oxygen transport, supports the functioning of the immune system, brain and cardiovascular system. When iron is not enough, it develops iron deficiency state, which can go into iron deficiency anemia.
According to estimates WHO, iron deficiency is the most common micronutrient disorder in the world, affecting about 30% of the population, including women, children, and vegetarians. Timely iron deficiency diagnosis helps prevent complications and choose the right treatment.
Why does iron deficiency occur?
The causes can be both external (related to nutrition) and internal (impaired absorption or blood loss).
Low dietary iron intake: meat restriction, vegetarianism, diets.
Chronic blood loss: heavy menstruation, stomach ulcers, hemorrhoids, internal bleeding.
Increased need: pregnancy, lactation, intensive training.
Absorption disorders: intestinal diseases (celiac disease, colitis, gastritis).
Infections and inflammation: affect iron metabolism, blocking its absorption.
Insufficient iron intake does not always manifest itself immediately. First, the body uses up its reserves, and only then symptoms appear. That is why it is important to know, What tests show iron deficiency?.
Symptoms of iron deficiency
In the early stages, symptoms may be subtle, but over time they appear:
constant fatigue, drowsiness;
headache, dizziness;
paleness of the skin and mucous membranes;
dryness, cracks on the lips;
brittle nails, hair loss;
shortness of breath, rapid heartbeat;
irritability, decreased concentration.
These signs can be present not only with anemia, but also with "hidden" iron deficiency, when hemoglobin is still normal, but reserves are already depleted.
What tests show iron deficiency?
For an accurate diagnosis, the doctor prescribes complex of laboratory tests, which allow you to assess not only the level of iron, but also its absorption.
| Indicator | Adult norm | What does it mean? |
|---|---|---|
| Hemoglobin (Hb) | 120–160 g/l in women, 130–170 g/l in men | Shows the blood's ability to carry oxygen |
| Serum iron | 10–30 μmol/L | Reflects the amount of iron circulating in the blood |
| Ferritin | 15–150 ng/ml (women), 30–400 ng/ml (men) | The main indicator of iron reserves |
| Transferrin | 2.0–3.6 g/l | Protein that carries iron in the blood |
| Transferrin iron saturation (TSAT) | 20–45% | If below 15%, there is iron deficiency |
| Total serum iron binding capacity (TIBC) | 40–70 μmol/L | Increases with iron deficiency |
Usually, the doctor analyzes all indicators in a complex. The most sensitive is ferritin — it decreases even before hemoglobin drops.
How to interpret the results
Low ferritin + normal hemoglobin → hidden iron deficiency.
Low ferritin + low hemoglobin → iron deficiency anemia.
Low iron + high transferrin → the body tries to compensate for the deficiency.
Low iron + high ferritin → impaired iron absorption or chronic inflammation.
To accurately determine the cause of the deficiency, the doctor may prescribe additional tests: stool analysis for occult blood, gastroscopy, celiac disease test, and vitamin B12 test.
Who is recommended to check iron levels?
Regular diagnostics are indicated for the following groups:
women of reproductive age (due to blood loss during menstruation);
pregnant and nursing mothers;
children and adolescents during periods of active growth;
people who do not eat meat;
athletes who have high energy expenditure;
patients with chronic gastrointestinal diseases.
For pregnant women ferritin level below 30 ng/ml is considered a risk indicator and requires correction.
How to prepare for the analysis
Blood donation on an empty stomach (don't eat for 8–10 hours).
You should not take iron supplements or vitamins containing iron for 2–3 days.
Avoid excessive physical exertion before the study.
Inform your doctor about taking hormonal drugs or antibiotics.
What to do if you detect iron deficiency
Eliminate the cause: If it is blood loss, treat the source; if it is diet, adjust your diet.
Add iron-rich foods:
meat (beef, liver, chicken);
legumes, spinach, buckwheat, pumpkin seeds;
apples, pomegranates, beets;
combine with vitamin C for better absorption.
Drug therapy: Your doctor may prescribe iron supplements (oral or intravenous) depending on your ferritin level.
Efficiency control: Repeat tests after 4–6 weeks help check whether iron levels are increasing.
Why it is important not to self-medicate
Excess iron is also harmful. Too much of it can lead to hemochromatosis — a condition where iron accumulates in the liver, heart, and pancreas, causing organ damage. Therefore, the dosage of drugs is selected only by a doctor, guided by the results of tests.
Prevention of iron deficiency
Balanced diet with enough protein.
Combining iron-containing foods with sources of vitamin C.
Limit coffee and tea after meals (they reduce iron absorption).
Regular examinations for at-risk groups — especially women and children.
Iron — it is not just an element, but an indicator of the body's vital energy. Timely diagnosis allows you to prevent serious consequences and regain strength, clarity of thinking, and good health.
Sources
World Health Organization (WHO). Iron Deficiency Anemia: Assessment, Prevention and Control, 2023.
Mayo Clinic. Iron deficiency: symptoms, diagnosis and treatment.
US Food and Drug Administration (FDA). Guidelines on iron supplements and monitoring.
