**Question:** The normal mean corpuscular hemoglobin (MCH) is:

A. 27 pg
B. 28 pg
C. 28 pg
D. 30 pg

**Core Concept:**
Mean Corpuscular Hemoglobin (MCH) is a fundamental laboratory parameter that represents the average amount of hemoglobin (Hb) per red blood cell (RBC). In clinical practice, MCH is obtained by dividing the mean corpuscular hemoglobin concentration (MCHC) by the mean corpuscular volume (MCV).

**Why the Correct Answer is Right:**
The correct answer (C) is 28 pg, which is the normal value for MCH when measured. The normal range for MCH is typically between 26 and 30 pg. This value is derived from the normal range of MCV (mean corpuscular volume), which is approximately between 80 and 100 fL (femtoliters).

**Why Each Wrong Option is Incorrect:**
A) 27 pg: This is slightly lower than the normal range and may indicate anemia or abnormal RBCs.
B) 30 pg: This is higher than the normal range and could suggest polycythemia or abnormal RBCs.
D) 30 pg: This is higher than the normal range, similar to option B, and could indicate polycythemia or abnormal RBCs.

**Clinical Pearl:**
The mean corpuscular hemoglobin (MCH) is a crucial value in diagnosing anemia or polycythemia. An elevated or decreased MCH can help narrow down the type of anemia or indicate the need for further diagnostic tests. For example, a low MCH (26 pg) is suggestive of iron deficiency anemia, while a high MCH (30 pg) points to vitamin B12 or folate deficiency anemia.

**Correct Answer:** C) 28 pg