Mentzer index more than 13 suggests a diagnosis of
**Core Concept**
The Mentzer index is a hematological parameter used to differentiate between iron deficiency anemia and anemia of chronic disease. It is calculated as the mean corpuscular volume (MCV) divided by the serum iron concentration. This index helps clinicians distinguish between the two conditions based on their distinct laboratory profiles.
**Why the Correct Answer is Right**
The Mentzer index is a useful tool in diagnosing iron deficiency anemia (IDA) versus anemia of chronic disease (ACD). A value greater than 13 suggests IDA, whereas a value less than 13 is more indicative of ACD. This is because in IDA, the body's iron stores are depleted, leading to low serum iron levels despite a relatively normal or high MCV. In contrast, ACD is characterized by inflammation and hepcidin-mediated sequestration of iron, resulting in low serum iron levels despite a low MCV.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the clinical significance of the Mentzer index. While it may be a distractor, it does not provide a clear alternative diagnosis or condition.
**Option B:** This option is incorrect because it misrepresents the threshold value for the Mentzer index. A value greater than 13 is actually indicative of IDA, not anemia of chronic disease.
**Option C:** This option is incorrect because it is a distractor that does not relate to the Mentzer index or its clinical application.
**Clinical Pearl / High-Yield Fact**
Remember that the Mentzer index is a useful tool in differentiating between iron deficiency anemia and anemia of chronic disease. However, it should be interpreted in conjunction with other laboratory parameters, such as serum ferritin and transferrin saturation, to ensure accurate diagnosis.
**Correct Answer:** C.