differential diagnosis of anemia types; diagnostics of the activity of erythrocyte formation processes; monitoring of iron deficiency treatment; determining the severity of anemia ("reticulocyte index" is used).

Blood for analysis is given exclusively on an empty stomach, before giving blood it is desirable to rest for 15 minutes. 12 hours before the study, you should exclude food, limit physical activity, and stop taking medications. If it is impossible to cancel the medication, it is necessary to inform the laboratory about this. Children under 5 years of age must drink boiled water (portions of up to 150-200 ml within 30 minutes) before donating blood.