Smoking and Anemia Diagnosis: Hidden Deficiency Under the Guise of Normalcy 🚬🔬
When interpreting a complete blood count in smoking patients, it is important to consider the physiological changes caused by carbon monoxide exposure. Smokers often exhibit a compensatory increase in hemoglobin concentration, which can mask an existing anemia.
What is the core of the problem? 🧪 Tobacco smoke provokes a state of functional hypoxia. In response, the body increases red blood cell production and hemoglobin concentration to maintain oxygen transport. However, this increase is “false” relative to the true needs of the tissues. The World Health Organization recommends using corrective coefficients when assessing hemoglobin levels in smokers to avoid diagnostic errors.
Study Results 📊 The following conclusions were drawn from the analysis of national research data (NHANES):
✅ Increased incidence. With the application of World Health Organization adjustments, the prevalence of anemia among smokers increased from 3.9% to 6.4%. ✅ Hidden risk group. The application of correction allowed for the additional identification of over 1 million adult patients with anemia that had previously gone unnoticed. ✅ Confirmed deficiency. Patients whose diagnosis was established only after hemoglobin level correction had objective signs of iron deficiency: decreased mean corpuscular volume, serum iron and ferritin levels, as well as increased soluble transferrin receptor levels and red cell distribution width.
Clinical Conclusions 🩺 Ignoring the fact of smoking when interpreting analyses can lead to underdiagnosis of anemic conditions. Specialists should consider the patient’s medical history and apply corrective criteria for hemoglobin concentration depending on the intensity of smoking.
Identifying borderline conditions requires not automatic prescription of iron preparations, but a thorough etiological search and confirmation of the diagnosis through iron metabolism assessment.
Source for citation: Huang R, Huang M, Zhang R. Smoking‐Related Distortion of Haemoglobin Concentration May Alter Anaemia Classification and Population Burden Estimates. British Journal of Haematology. 2026.
