Increase in MCHC is associated with
**Core Concept**
MCHC stands for Mean Corpuscular Hemoglobin Concentration, a critical parameter used to assess the average concentration of hemoglobin within red blood cells. It is an essential component of the complete blood count (CBC) and helps clinicians diagnose various hematological disorders.
**Why the Correct Answer is Right**
The MCHC is calculated by dividing the hemoglobin concentration by the hematocrit (the proportion of blood volume occupied by red blood cells). An increase in MCHC indicates that the red blood cells have a higher concentration of hemoglobin, which can be due to conditions such as polycythemia vera, erythrocytosis, or hemoglobinopathies like hemoglobin C disease. This occurs due to an imbalance in the production of hemoglobin or the breakdown of red blood cells.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as an increase in MCHC is not typically associated with hemolytic anemia, which is characterized by the premature destruction of red blood cells. While hemolytic anemia can lead to a decrease in MCHC, it does not cause an increase.
**Option B:** This option is incorrect as an increase in MCHC is not directly related to the presence of spherocytes, which are small, irregularly shaped red blood cells. Spherocytes are more commonly associated with hereditary spherocytosis, a genetic disorder that affects the red blood cell membrane.
**Option C:** This option is incorrect as an increase in MCHC is not typically associated with the presence of microcytosis, which refers to small red blood cells. Microcytosis is more commonly associated with conditions such as iron deficiency anemia or thalassemia.
**Clinical Pearl / High-Yield Fact**
When interpreting MCHC values, it's essential to consider the overall context of the patient's CBC results, including the hematocrit, hemoglobin concentration, and red blood cell indices. A high MCHC can indicate conditions that require prompt medical attention, such as polycythemia vera or hemoglobinopathies.
**Correct Answer:** D.