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An Absolute Lymphocyte Count test measures the total number of lymphocytes in the blood. Lymphocytes are a type of white blood cells that play an important role in your immune system and help 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 pathogens.

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 helps prevent certain diseases.

An Absolute Neutrophil Count test measures the percentage of neutrophils per microliter of blood. Neutrophils are a type of WBC and play an integral part in the body's immune system. They help fight off bacterial infections in the body by identifying and destroying foreign invaders, such as disease-causing microorganisms. 

There are five types of WBCs: neutrophils, lymphocytes, monocytes, eosinophils, and basophils. A Differential Leukocyte Count test measures the percentage of each type of WBC in the blood. Leukocytes or WBCs 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.

This further contains

• Differential Neutrophil Count
• Differential Lymphocyte Count
• Differential Monocyte Count
• Differential Eosinophil Count
• Differential Basophil Count

A 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.

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.

A 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. 

A 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.

An Absolute Basophil Count test measures the total number of basophils in the blood. Basophils are small, spherically-shaped cells that originate from bone marrow and make up almost 1% of the total white blood cells in the body. They attack a foreign substance and release proteins like histamine and heparin to destroy harmful substances, such as 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 to avoid blood clotting at that site.

An Absolute Monocyte Count test measures the total number of monocytes in the blood. Monocytes are a type of WBC that originate from bone marrow and travel to different tissues via the blood. Once they are inside the tissue, these cells get converted to macrophages (a type of cell that digest harmful substances). Monocytes are the second line of defense mechanism of the human body after neutrophils. These cells are also responsible for the removal of injured or dead cells, microorganisms, and other insoluble particles from the blood. 

An Absolute Eosinophil Count test measures the number of eosinophils in the blood and provides important information about the functioning of the immune system. 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. Other functions of these cells include movement to the inflammation areas, trapping substances, killing cells, and bactericidal and antiparasitic activities. They also help in the treatment of immediate allergic reactions and modulation of inflammatory responses. By measuring the number of eosinophils in the blood, this test provides important information about the functioning of the immune system.

A 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.

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.

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 MPV test measures the average size of the platelets in your 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 bleeding whenever there is an injury or trauma to a tissue or blood vessel by adhering and accumulating at the injury site, and by releasing chemical compounds that stimulate the gathering of more platelets. After these steps, 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, 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 are not functioning properly, a stable clot might not form. These unstable clots can result in an increased risk of excessive bleeding. 

A PDW test reflects variability in platelet size, and is considered a marker of platelet function and activation (clot formation in case of an injury). This marker can give you additional information about your platelets and the cause of a high or low platelet count. Larger platelets are usually younger platelets that have been recently released from the bone marrow, while smaller platelets may be older and have been in circulation for a few days. Higher PDW values reflect a larger range of platelet size, which may result from increased activation, destruction and consumption of platelets.

An 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.

A Potassium test measures the levels of potassium in your body. Potassium is one of the key electrolytes that helps in the functioning of the kidneys, heart, nerves, and muscles. It also balances the effect of sodium and helps keep your blood pressure normal. The body absorbs the required amount of potassium from the dietary sources and eliminates the remaining quantity through urine. Potassium level is typically maintained by the hormone aldosterone. Aldosterone acts on the nephrons present in the kidneys and activates the sodium-potassium pump that helps the body reabsorb sodium and excrete potassium. This aids in maintaining a regular and steady potassium level in the blood.

A Chloride test measures the amount of chloride in your body. Chloride is present in all body fluids and is found in the highest concentration in the blood and extracellular fluid (fluid present outside the cells). The body gets most of the chloride through dietary salt (sodium chloride or NaCl) and a small amount through other food items. The required amount of chloride is absorbed in the body and the excess amount is excreted by the kidneys through urine. When the chloride is combined with sodium it is mostly found in nature as salt. Chloride generally increases or decreases in direct relationship to sodium but may also change without any changes in sodium levels when there are problems with the body's pH. Usually, the normal blood chloride level remains steady with a slight fall after meals (because the stomach produces hydrochloric acid using chloride from the blood after we eat food).

A Sodium test is used to measure the amount of sodium in your body. Sodium is present in all body fluids and is found in the highest concentration in the extracellular fluid. The body absorbs the required amount of sodium through dietary salts and the remaining is eliminated through the kidneys. The body keeps your blood sodium within a normal and steady range by following three mechanisms:

• By producing hormones that control the elimination of sodium through urine, such as natriuretic peptides and aldosterone.

• By producing hormones that prevent water loss, such as antidiuretic hormone (ADH) or vasopressin.

• By controlling thirst (an increase in blood sodium level can make you thirsty and cause you to drink water, returning your sodium to normal).

These mechanisms regulate the amount of water and sodium in the body and control blood pressure by keeping the amount of water in check. When the level of sodium in the blood changes, the water content in your body changes. These changes can be associated with dehydration, edema, and change in blood pressure.

The Albumin/Globulin Ratio, Serum test is performed if a liver or kidney disease is suspected. It quantifies the concentrations of two essential blood proteins, albumin and globulin. The test is a comparison figure in which albumin present in your body is divided by the amount of globulin to get the Albumin/Globulin) ratio. This ratio helps assess how well these two proteins are balanced and helps evaluate liver or kidney health.

A Globulin, Serum test measures the levels of globulin protein in the blood. Globulin is one of the major proteins (about 40% of the total protein) found in the body and is produced by the liver and immune cells. It usually exists in different forms: alpha globulins, beta globulins, and gamma globulins. These forms play an important role in liver and kidney functioning, blood clotting, and fighting off infections. 

A Serum Albumin test measures the level of albumin protein in your blood. Albumin is one of the major proteins found in your body; about 60% of the total protein is made up of albumin, which is produced by the liver. It helps carry small molecules, such as hormones, vitamins, minerals, and medicines, throughout the body. It also serves as a source of amino acids for tissue metabolism. Albumin helps stop the fluid from leaking out of the blood vessels. When the albumin level is insufficient, the fluid can leak out of your blood vessels and build up in your lungs, belly, or other parts of your body.

The Protein Total test measures the total amount of major proteins in your body, namely, albumin and globulin. It is also used to detect diseases related to improper protein metabolism and diseases that affect the liver, kidneys, or immune system. A higher than normal level of protein total in your body may indicate medical conditions such as viral hepatitis, cirrhosis, HIV/AIDS, multiple myeloma, etc. On the other hand, a lower-than-normal level can indicate conditions like liver disease, malnutrition, kidney disease, or an autoimmune disorder.