Can a routine blood test detect anemia?
Sep 23, 2025
Source: Cainiu Health
Dr. Liu Feng
Introduction
In general, a routine blood test can detect anemia, but a comprehensive assessment should take into account specific indicators and the type of anemia. Fasting is usually not required before a routine blood test; however, if other tests with special requirements are performed simultaneously, instructions from the physician should be followed. After the test results are available, a qualified doctor should interpret them in combination with the individual's symptoms and medical history.
In general, a routine blood test can detect anemia, but a comprehensive assessment based on specific indicators and the type of anemia is required. The detailed analysis is as follows:
A complete blood count (CBC) includes key indicators such as red blood cell (RBC) count and hemoglobin concentration. Anemia essentially refers to a reduction in peripheral blood RBC volume below the normal range. Hemoglobin, the vital substance within red blood cells responsible for oxygen transport, directly reflects the oxygen-carrying capacity of red blood cells through its concentration levels. When anemia occurs, the RBC count may decrease and hemoglobin concentration typically declines accordingly. These values can be accurately measured using CBC testing equipment, and by comparing the results with standard reference ranges, the presence of anemia can be determined.
Fasting is generally not required before a CBC test; however, if other tests with special requirements are performed simultaneously, medical instructions should be followed. After obtaining the test results, a professional physician must evaluate them in conjunction with the individual's symptoms and medical history. Self-diagnosis of anemia type or indiscriminate use of medication based solely on a single indicator is not recommended. If anemia is confirmed, further examinations should be conducted to identify the underlying cause, followed by targeted interventions.
