Complete Blood Count (CBC)

An Hb (Hemoglobin) test measures the concentration of hemoglobin protein in your blood. Hemoglobin is made up of iron and globulin proteins. It is an essential part of RBCs and is critical for oxygen transfer from the lungs to all body tissues. Most blood cells, including RBCs, are produced regularly in your bone marrow. The Hb test is a fundamental part of a complete blood count (CBC) and is used to monitor blood health, diagnose various blood disorders, and assess your response to treatments if needed.

The Differential Basophil Count test measures the relative percentage of basophils in the blood. Basophils are spherically shaped small cells that originate from bone marrow and make up almost 1% of the total white blood cells in the body. These cells attack a foreign substance and release proteins, like histamine and heparin, to destroy harmful substances like allergens, pathogens, or parasites. Histamine helps widen the blood vessels and make space for more immune cells to come to the site of infection or injury, whereas heparin acts as a blood-thinning agent and helps avoid blood clotting at the infection or injury site.

An MCHC test measures the average amount of hemoglobin in a given volume of RBCs. MCHC is calculated by dividing the amount of hemoglobin by hematocrit (volume of blood made up of RBCs) and then multiplying it by 100. 

An MCH test measures the average amount of hemoglobin in a single red blood cell (RBC). Hemoglobin is an iron-containing protein in RBCs, and its major function is to transport oxygen from the lungs to all body parts. This test provides information about how much oxygen is being delivered to the body by a certain number of RBCs.

The Differential Eosinophil Count test measures the proportion of eosinophils in relation to other types of white blood cells (WBC), such as neutrophils, lymphocytes, basophils, and monocytes. Eosinophils originate from bone marrow and have a lifespan of 8-18 hours. These cells are involved in fighting certain types of infections and responding to allergic reactions in the body. The eosinophils have varied functions that include the physiological role in organ formation, such as the development of post-gestational mammary glands. Other functions include its movement to the areas of inflammation, trapping the substances, and killing the cells with bactericidal and antiparasitic activities. It also helps in the treatment of immediate allergic reactions and modulation of inflammatory responses.

The Platelet Count test measures the average number of platelets in the blood. Platelets are disk-shaped tiny cells originating from large cells known as megakaryocytes, which are found in the bone marrow. After the platelets are formed, they are released into the blood circulation. Their average life span is 7-10 days. 

Platelets help stop the bleeding, whenever there is an injury or trauma to a tissue or blood vessel, by adhering and accumulating at the injury site and releasing chemical compounds that stimulate the gathering of more platelets. A loose platelet plug is formed at the site of injury and this process is known as primary hemostasis. These activated platelets support the coagulation pathway that involves a series of steps, including the sequential activation of clotting factors; this process is known as secondary hemostasis. After this step, there is a formation of fibrin strands that form a mesh incorporated into and around the platelet plug. This mesh strengthens and stabilizes the blood clot so that it remains in place until the injury heals. After healing, other factors come into play and break the clot down so that it gets removed. In case the platelets are not sufficient in number or not functioning properly, a stable clot might not form. These unstable clots can result in an increased risk of excessive bleeding. 

The Differential Lymphocyte Count test measures the proportion of different types of lymphocytes in the blood. Lymphocytes are a type of white blood cells that play an important role in the functioning of your immune system, which helps your body fight disease and infection. 

There are two main types of lymphocytes:

• T lymphocytes (T cells): T cells control your body’s immune system response and directly attack and kill infected cells and tumor cells.

• B lymphocytes (B cells): B cells make antibodies. Antibodies are proteins that target viruses, bacteria, and other foreign invaders.

Lymphocytes help your immune system remember every antigen (a foreign substance) it comes in contact with. After an encounter, some lymphocytes turn into memory cells. When these memory cells run into an antigen again, they recognize it and quickly respond. It is also the reason why getting vaccinated can help prevent certain diseases.

The Hematocrit test measures the proportion of red blood cells (RBCs) in your blood as a percentage of the total blood volume. It is a crucial part of a complete blood count (CBC) and helps in assessing your blood health. RBCs are responsible for carrying oxygen from the lungs to different parts of the body. The hematocrit test provides valuable information about your blood's oxygen-carrying capacity.

Higher-than-normal amounts of RBCs produced by the bone marrow can cause the hematocrit to increase, leading to increased blood density and slow blood flow. On the other hand, lower-than-normal hematocrit can be caused by low production of RBCs, reduced lifespan of RBCs in circulation, or excessive bleeding, leading to a reduced amount of oxygen being transported by RBCs. Monitoring your hematocrit levels is essential for diagnosing and managing various blood-related disorders.

The Red Blood Cell Count test measures the total number of red blood cells in your blood. RBCs are the most abundant cells in the blood with an average lifespan of 120 days. These cells are produced in the bone marrow and destroyed in the spleen or liver. Their primary function is to help carry oxygen from the lungs to different body parts. The normal range of RBC count can vary depending on age, gender, and the equipment and methods used for testing.

The Differential Neutrophil Count test measures the total percentage of neutrophils in the blood. This test helps your doctor determine the underlying cause of symptoms like fever, inflammation, or infection by identifying the type of infection, i.e., bacterial or viral.

The Total Leukocyte Count test measures the numbers of all types of leukocytes, namely neutrophil, lymphocyte, monocyte, eosinophil, and basophil, in your blood. Leukocytes or WBCs are an essential part of our immune system. These cells are produced in the bone marrow and defend the body against infections and diseases. Each type of WBC plays a unique role to protect against infections and is present in different numbers.

The Peripheral Smear Examination test is performed to check the characteristics of blood cells including:

1. Red blood cells (RBCs)
2. White blood cells (WBCs)
3. Platelets

By placing the blood sample on a specifically treated slide, these blood components are analyzed under a microscope for their shape, size, and number. Any irregularity in these cells indicates blood disorders or abnormality, the presence of parasites in the blood, etc. This test is also a beneficial tool in monitoring a blood disease or deciding whether a certain medication or therapy is working effectively or not.

A Differential Monocyte Count test measures the relative percentage of monocytes in the blood.

Monocytes are the type of white blood cells that originate from bone marrow and travel to different tissues via blood. Once they are inside the tissue, they get converted into macrophages (a type of cell that digests harmful substances). These cells are the second line of defense in the human body after neutrophils. Monocytes are responsible for the removal of injured or dead cells, microorganisms, and other insoluble particles from the blood. 

The RDW CV test which is part of red cell indices, helps identify characteristics of red blood cells. RDW (red cell distribution width) measures the variations in the sizes of red blood cells, indicating how much they differ from each other in a blood sample. RDW is expressed as RDW-CV, a coefficient of variation. A higher RDW may suggest more variation in red cell sizes, while a lower RDW indicates more uniform red cell sizes.