Red cell count is carried out byA.HaemocytometerB.HaemoglobinometerC.SphygmomanometerD.Electrocardiogram

The correct answer is A. Haemocytometer.

A haemocytometer is a specialized device used for counting red blood cells (RBCs) and other blood cells. It consists of a glass microscope slide with a calibrated grid pattern etched into its surface. The haemocytometer is used in conjunction with a microscope to count the number of cells in a known volume of blood sample.

To perform a red cell count using a haemocytometer, a small amount of blood is diluted with a special solution to ensure accurate counting. The diluted blood is then placed on the haemocytometer slide, and the RBCs within a specified number of squares on the grid are counted under a microscope. By knowing the volume of blood and the number of cells counted, the concentration of red blood cells can be calculated.

Haemoglobinometer (B) is used to measure the concentration of hemoglobin in the blood. Sphygmomanometer (C) is used to measure blood pressure. Electrocardiogram (D) is a test that records the electrical activity of the heart. None of these devices are specifically used for red cell count.