Red cell count is carried out by

Options

A. haemocytometer
B. haemoglobinometer
C. sphygmomanometer
D. electrocardiogram

Answer

To determine which apparatus is used for carrying out the red cell count, we will analyze each option provided in the question:

1. **Hemocytometer**:
- The term "hemo" refers to blood, and a hemocytometer is specifically designed to count blood cells, including red blood cells (RBCs) and white blood cells (WBCs). It is a specialized microscope slide that allows for the counting of cells in a defined volume of blood.

2. **Hemoglobinometer**:
- The term "hemoglobin" refers to the protein in red blood cells that carries oxygen. A hemoglobinometer is used to measure the concentration of hemoglobin in the blood, not the count of red blood cells.

3. **Sphygmomanometer**:
- This device is used to measure blood pressure. It does not have any relation to counting blood cells.

4. **Electrocardiogram (ECG)**:
- An electrocardiogram records the electrical activity of the heart. It is not used for counting blood cells.

After analyzing all the options, we can conclude that the correct apparatus for carrying out the red cell count is the **hemocytometer**.

### Final Answer:
The red cell count is carried out by a **hemocytometer**.