Post COVID Health Checkup near me in Greater Noida

The Bilirubin Total measures the amount of bilirubin present in the blood of a person. Bilirubin is an orange-yellow waste pigment produced by the normal breakdown of heme. The heme is a component of hemoglobin and is found in red blood cells. The liver processes the bilirubin and eliminates it from the body. 

The life span of red blood cells is about 120 days. The heme which is released from the hemoglobin is converted into bilirubin which is called unconjugated bilirubin. It is then carried to the liver by proteins, where it gets attached to sugars and becomes conjugated bilirubin. This conjugated bilirubin enters the bile from the liver and passes to the small intestine. Here, it gets broken down by the bacteria and further gets eliminated in the stool. These breakdown products of bilirubin are responsible for giving the characteristic brown color to the stool.

A healthy adult body produces approximately 250 - 350 mg of bilirubin daily. About 85% of bilirubin comes from damaged or degraded RBCs while the remaining amount comes from the bone marrow or liver.

Small amount of unconjugated bilirubin is released in the blood normally, but there is no virtual presence of conjugated bilirubin in the blood. 

Both the forms of bilirubin can be measured or evaluated by the laboratory tests, and total bilirubin (sum of conjugated or unconjugated bilirubin) may be reported. In case there is an increase in levels of bilirubin, there will be yellowing of the skin and white of the eyes, giving the appearance of jaundice.  

Alanine Transaminase test measures the levels of alanine transaminase in the blood.  Alanine Transaminase is an enzyme which is found in liver and kidney cells. However, this enzyme, in less quantity, can be found in the muscles and the heart. Its function is to convert alanine (an amino acid found in proteins) to pyruvate (intermediate in cellular energy production). 

Generally, these levels of alanine transaminase in the blood remain low in healthy individuals. However, if there is any damage to the liver, alanine transaminase is released in the blood. This process helps in early detection of any damage to the liver. 

The function of the liver is to process the nutrients of the body. It also produces bile which helps in digesting fats along with the production of other important proteins such as blood clotting factors and albumin. The liver breaks the potentially toxic substances into harmless products which can be used or eliminated by the body. 

This test is done with another liver enzyme, aspartate aminotransferase (AST) as a part of the liver panel. In case of damage to the liver, there is a sudden rise in levels of both enzymes. However, alanine transaminase is more specific for the liver. In some cases, it is possible that only one of them is increased. The AST/ALT ratio can be calculated to differentiate between various causes and severity of the liver injury. This can also help to distinguish whether the injury is from damage to the liver or heart or muscles.

The alkaline phosphatase, serum test measures the alkaline phosphatase levels in the blood. Alkaline phosphatase (ALP) is an enzyme which is found in various tissues throughout the body. The maximum concentrations of ALP are present in cells of bone and liver. Usually, raised levels of ALP are caused due to liver disease or bone disorders.

ALP is found in the liver on the cell edges that join to form bile ducts. The bile ducts are the tiny tubes which drain bile from the liver to the bowels. The bile juice formed is required by the small intestine to help digest fat in the diet.

ALP is produced by osteoblasts cells in the bone which are involved in bone formation. The various tissue types produce distinct forms of ALP which are known as isoenzymes.

The levels of ALP generally increase to a great extent if one or more bile ducts get blocked. The reason could be inflammation of the gallbladder which is known as cholecystitis or the presence of gallstones. The small amount of increase of ALP in the blood can be seen in liver cancer and cirrhosis. These high levels can also be observed if there is intake of medications toxic to the liver and hepatitis.

In conditions, where there is formation of excessive bones such as Paget’s disease one can also have increased levels of ALP. Along with that, higher blood ALP levels can be seen in children and adolescents, as they are in the growing stage and so are their bones.

Aspartate aminotransferase (AST) is an enzyme which is found in most of the body cells but mainly in the heart and liver. It is also present in kidneys and muscles but in smaller amounts. Normally, the levels of AST are low, but the levels rise when there is an injury to cells of the liver or muscle. 

The function of the liver is to process the nutrients of the body. It also produces bile which helps in digesting fats along with the production of other important proteins such as blood clotting factors and albumin. The liver breaks the potentially toxic substances into harmless products which can be used or eliminated by the body. 

The rise in levels of AST can be due to conditions causing liver damage such as hepatitis, drugs which are toxic to liver, cirrhosis, or alcoholism. The AST test is not specific for the liver. Its levels may also rise in conditions which affect other parts of the body.

This test is done with alanine aminotransferase (ALT) test. Both the enzymes are found in the liver and their levels rise in case of liver damage. The ratio of AST/ALT helps in differentiating between the causes of liver damage in case of injury to heart or muscle. 

Creatinine is a waste product which is produced by the muscles due to the breakdown of a compound called Creatine. During the cycle of energy production which is required to contract muscles, creatine is produced. Kidneys remove creatinine from the body by filtering it from the blood and then releasing it into the urine. This test measures the amount of creatinine in the blood.

The body produces creatine and creatinine at a relatively same rate. Since kidneys filter most of the creatinine from the blood and release it into the urine, the blood levels can be used as an indicator to know how well the kidneys are functioning. The amount of creatinine produced depends upon the size of the person as well as their muscle mass. That is why levels of creatinine are higher in men as compared to women and children.

The Potassium Test measures the concentration of potassium in the blood.

Potassium is one of the essential body electrolytes along with sodium, chloride, bicarbonate, etc. As an electrolyte, potassium helps to regulate the amount of fluids present in the body and to maintain a correct pH balance. It performs a vital role in cellular metabolism and transport of nutrients and waste products in and out of cells. It is also essential in the transmission of nerve impulses to muscles and muscle activity.

Sufficient amount of potassium required by the body is absorbed from dietary sources, and the remaining unabsorbed potassium is excreted by the kidneys. Body potassium is maintained within a small normal range principally by the hormone aldosterone. Aldosterone acts on the nephrons in the kidneys and activates a sodium-potassium pump which helps the body to reabsorb sodium and excrete potassium. This helps to maintain the potassium concentration in the blood within its normal range. Deviation of potassium concentration from its normal range gives rise to Hyperkalemia (high potassium level in blood), or Hypokalemia (low potassium level in blood). Both these conditions may produce a number of symptoms, and may even be fatal if not controlled.

The Uric acid test measures the levels of uric acid in the blood. Uric acid is a nitrogenous compound produced by the metabolic breakdown of purine. Purines are nitrogenous bases in DNA forming parts of the structural framework of the cells. Breakdown of purines occurs when cells become old and die, forming uric acid. Uric acid is also formed from the metabolic breakdown of some types of food like red meat, seafood, beans, etc.

Most of the uric acid in the blood is filtered and eliminated by the kidneys and a small remaining amount in the stool. The concentration of uric acid in the blood can increase due to overproduction of uric acid or improper elimination of uric acid, and this condition is called Hyperuricemia. Hyperuricemia can also be caused due to cancer treatment by chemotherapy or radiotherapy. These treatment methods kill the cancer cells, which may leak the uric acid into the blood.

Excess uric acid can form crystals in the synovial fluid between the joints causing inflammation and pain. This condition is called gout and can severely damage the joints if left untreated. The Uric Acid Test can indicate the presence of gout, or risk of formation of gout. However, it is not a definitive test for gout. Confirmatory test for gout is performed by analysis of synovial fluid (joint fluid) for monosodium urate crystals. Chronic Hyperuricemia can cause the formation of tophi, which are hard lumpy deposits of uric acid crystals formed under the skin, in the joints, and at the top of the ears. Tophi cause severe damage to the joints and may compress nerves causing chronic pain and disfigurement. The excess uric acid may also deposit and crystallize in the kidneys causing kidney stones and acute renal failure.

Chloride is an essential mineral which acts as an electrolyte along with potassium, sodium, bicarbonate, etc. It helps to maintain the normal fluid and electrolyte balance of the body. It also acts as a buffer to help maintain the pH balance of the body. It also plays essential roles in metabolism. Chloride is used by the stomach to produce hydrochloric acid (HCl) for digestion. Chloride is present in all body fluids and is found in highest concentration in the blood and extracellular fluid (fluid present outside the cells).

Most of the chloride intake is through dietary salt (sodium chloride or NaCl), and a small portion through other food items. The body absorbs the required amount and the kidneys excrete the remaining through urine. The concentration of chloride in blood is maintained within a very narrow range by the body and usually increases or decreases in direct correlation with sodium levels.

The Sodium test measures the concentration of sodium in the blood.

Sodium is an essential body electrolyte which, along with potassium, chloride, bicarbonate, etc., helps to maintain the normal fluid and pH balance in the body. It is also vital for cellular metabolism, and in the activity of nerves and muscles and transmission of impulses between them. Sodium is present in all body fluids and is found in highest concentration in the blood and extracellular fluid.

Sodium is supplied to the body principally through dietary salts (sodium chloride or NaCl), and a small portion of sodium is absorbed through other food items. The required portion is absorbed by the body and the remaining is excreted by the kidneys through urine. The body maintains a very narrow range of sodium concentration by three mechanisms:

·         Secretion of hormones natriuretic peptides and aldosterone to control sodium elimination through urine

·         Secretion of antidiuretic hormone (ADH), also called Vasopressin, to control the volume of water eliminated through urine

·         Induction of thirst

Any disruption in the abovementioned mechanisms gives rise to an imbalance in the concentration of sodium in the blood to produce Hyponatremia (low blood sodium concentration), or Hypernatremia (high blood sodium concentration). Both these conditions produce a number of symptoms and may even lead to death.

The Blood Urea Nitrogen test measures the amount of urea nitrogen in the blood. Urea is a waste product which is formed in the liver. It is formed when protein is metabolized into amino acids. This leads to the production of ammonia which is further converted into urea which is a less toxic waste product. 

Both ammonia and urea have nitrogen as their component. The liver releases urea into the blood which is then carried out to the kidneys. Here, it is filtered out of the blood and then released into the urine. Since this is a continuous process, a small and stable amount of urea nitrogen always remains in the blood.

In case of kidney or liver diseases, there is a change in the amount of urea present in the blood. If the liver produces urea in increased amounts or if there is any problem in the functioning of the kidneys, there can be difficulty in filtering out wastes of the blood which will lead to rising in urea concentrations in the blood. If due to liver damage or disease there is less production of urea, the concentration of BUN will fall.

The BUN test is done along with creatinine test to evaluate kidney function to diagnose kidney disease and to monitor patients undergoing treatment of kidney disease. 

Blood is made up of different types of cells which are suspended in a fluid called plasma. These include erythrocytes or red blood cells, leukocytes or white blood cells, and platelets. Blood cells are produced by the hematopoietic cells in bone marrow and are then released into circulation. RBCs carry oxygen to the tissues, platelets help in blood clotting at a site of injury, and leukocytes form an integral part of the immune system of the body.

WBCs are of five types, each having a different function and present in different numbers:

1.      Neutrophils: Under normal conditions, the number of neutrophils present is higher than any other type of WBCs.. They provide protection against pathogens, mostly bacteria and sometimes fungi. Neutrophils engulf the pathogens completely and digest them (the process is called phagocytosis). They are usually associated with acute or short-term infections.

2.      Eosinophils: Eosinophils are WBCs that are primarily responsible to fight parasitic infections. They are also involved in allergic reactions and regulation of the extent of immune response.

3.      Basophils: Basophils are WBCs which are present in the lowest numbers in circulation. They are considered to play an important role in allergic response.

[Neutrophils, eosinophils, and basophils are together classified as granulocytes. Granulocytes are the WBCs which contain granules present in their cytoplasm. These granules secrete chemicals during immune response.]

4.      Monocytes: Monocytes are WBCs which are also involved in protection against infectious pathogens by phagocytosis like neutrophils. However, monocytes are more commonly associated with chronic or long-term infections.

5.      Lymphocytes: These are specialized WBCs which are responsible for recognizing and neutralizing foreign (non-self) cells and cancer cells in the body. Lymphocytes are of three types, all of which are differentiated from a common type of lymphocyte progenitor cell:

·         T cells or T lymphocytes are produced in the bone marrow and mature in the thymus gland. They are responsible for differentiating between self and non-self cells of the body. T cells are also responsible for the initiation and extent of immune response, and targeted destruction of cancer cells and virus.

·         B cells or B lymphocytes are control acquired immunity by producing antibodies against antigens found on foreign cells and pathogens like bacteria and viruses.

·         Natural killer cells or NK cells destroy all foreign cells tagged by antibodies, cancer cells and virus-infected cells by phagocytosis.

Depending on various factors like age, gender, health condition, environmental factors, etc., varying amounts of different types of WBCs circulate in the blood. The bone marrow increases production of WBCs in response to an infection or inflammation anywhere in the body, which are then called to the site by a series of chemical signals, where they work to treat the condition. Depending on the condition, the count of one or more types of WBCs remains high in the blood. Once the condition subsides, WBC production by the bone marrow decreases and their count in circulation falls back to normal levels. Elevated amount of one or more types of leukocytes for a long time may be an indication of a chronic condition that is not resolving naturally and might need urgent attention.

Apart from an infection or inflammation, WBC count in blood can also be affected by other conditions like disorders of the immune system, autoimmune conditions, cancer, etc. One or more types of WBC count may be higher or lower than normal in these cases.

Differential Leukocyte Count Test serves as an indication of a condition affecting the body. Further tests are performed to confirm a particular condition and direct treatment.

This further contains

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

The hemoglobin test measures the amount of hemoglobin in the blood.

Hemoglobin (Hb) is a protein found in red blood cells (RBCs) that carries oxygen from the lungs to the body tissues, and to exchange the oxygen for carbon dioxide. Hemoglobin then carries the carbon dioxide back to the lungs and where it is exchanged for oxygen. Iron is an essential part of hemoglobin. Most blood cells, including red blood cells, are produced regularly in your bone marrow (present within the cavities of many of large bones). To produce hemoglobin and red blood cells, your body needs iron, vitamin B12, folate and other nutrients from the foods you eat.

A decrease in hemoglobin concentration in blood results in anemia. Anemia is a blood disorder characterized by a decrease in the total amount of red blood cells (RBCs) or hemoglobin in the blood or a lowered ability of the blood to carry oxygen to body organs and tissues. Anemia is the most common blood disorder, affecting about a third of the global population and can cause symptoms like tiredness (fatigue), weakness, shortness of breath etc.

The hemoglobin test is usually performed as a part of complete blood count (CBC) test.

The platelet count measures the number of platelets present in the blood. Platelets are also known as thrombocytes which are tiny fragments of cells. These are formed from large cells which are found in the bone marrow known as megakaryocytes. After the platelets are formed, they are released into the blood circulation.

Whenever there is an injury to a tissue or blood vessel, bleeding starts. At this point, platelets help in stopping the bleeding in three ways:

• The platelets will adhere to the injury site

• The platelets will accumulate at the injury site 

• The platelets will release chemical compounds which stimulate gathering of other platelets

With these steps, a loose platelet connection forms at the site of injury. This process is known as primary hemostasis. The activated platelets start to support the coagulation cascade which involves a series of steps that includes the sequential activation of clotting factors. This process is known as secondary hemostasis which results in the formation of fibrin strands that knit through the loose platelet connection to form a fibrin net. After that, the connection is compressed to form a stable clot so that it remains in place until the injury heals. Once the injury is healed, other factors come into play and break it 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. 

Blood is made up of different types of cells suspended in a fluid called plasma. These include erythrocytes or red blood cells, leukocytes or white blood cells, and platelets. Blood cells are produced by the hematopoietic cells in bone marrow and are then released into circulation. RBCs carry oxygen to the tissues, platelets help in blood clotting at a site of injury, and leukocytes form a part of the immune system of the body. WBCs are of five primary types: neutrophils, basophils, eosinophils, monocytes, and lymphocytes. Lymphocytes are further of three types: B-Lymphocytes, T-Lymphocytes, and natural killer (NK) cells. Neutrophils, basophils, eosinophils are collectively called granulocytes since they contain granules in cytoplasm.

Depending on various factors like age, gender, health condition, environmental factors, etc., varying amounts of different types of WBCs circulate in the blood. The bone marrow increases the production of WBCs in response to an infection or inflammation anywhere in the body. These WBCs are called to the site by a series of chemical signals, where they work to treat the condition. During this time, the total leukocyte count remains high in blood. Once the infection or inflammation subsides, WBC production by bone marrow decreases and WBC count in circulation falls back to normal levels. A continuously elevated WBC count may thus be an indication of a chronic condition that is not resolving naturally and might need urgent attention.

Apart from an infection or inflammation, WBC count in blood can also be affected by other conditions like disorders of the immune system, autoimmune conditions, cancer, etc. WBC count may be higher or lower than normal in these cases.

WBC count test serves as an indication of a condition affecting the body. Further tests are performed to confirm a particular condition and direct treatment.

Human blood is made up of erythrocytes or red blood cells, leukocytes or white blood cells, and platelets suspended in a fluid called plasma. Each of the component of blood performs a specific function. The packed cell volume or hematocrit is a ratio of the volume occupied by the RBCs to the total volume occupied by all the blood components or whole blood.

The RBCs transport inhaled oxygen from the lungs to all the cells of the body, and also a small amount of carbon dioxide from the cells to the lungs to be exhaled. The majority of carbon dioxide is transported in solution in plasma as bicarbonate ions. They contain a protein called hemoglobin which binds to oxygen for transport.

RBCs are produced in the erythropoietic cells of the bone marrow in response to the hormone Erythropoietin secreted by the kidneys when oxygen saturation of blood is detected to be low (hypoxia). The average lifespan of RBCs in circulation is 120 days. Hence, the bone marrows continuously produce RBCs to maintain a steady concentration in blood. The Packed Cell Volume Test depends on the count as well as the average size of the RBCs (Mean Corpuscular Volume or MCV). Higher than normal amount of RBCs produced by the bone marrow can cause the hematocrit to increase, leading to increased blood density and slow blood flow. Lower than normal hematocrit can be caused by low production of RBCs, reduced lifespan of RBC in circulation, or excessive bleeding, leading to reduced amount of oxygen reaching the cells.

This further contains

• Absolute Eosinophil Count
• Absolute Neutrophil Count
• Absolute Basophil Count
• Absolute Monocyte Count