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Thyroid Stimulating Hormone (TSH) test measures the amount of TSH in your blood which helps to find out if the thyroid gland is working normally or not. Low TSH levels indicate hyperthyroidism and high TSH levels indicate hypothyroidism.

In case of hyperthyroidism, the thyroid gland produces very high amounts of thyroid hormones (T3 and T4) and you may experience symptoms of weight loss, rapid heartbeat, tremors, sweating, anxiety, increased sensitivity towards heat, etc. In case of Hypothyroidism, there is a decrease in the production of thyroid hormones (T3 and T4) which may cause weight gain, fatigue, slow heart rate, increased sensitivity towards cold, depression, dry and thin hair, etc.

There is a feedback system in the body to maintain stable amounts of the thyroid hormones (T3 and T4) in the blood. TSH signals the thyroid gland to make and release the thyroid hormones (T3 & T4) into the blood when the level of thyroid hormones is low and can also signal the thyroid gland to lower the production of thyroid hormones when the level of thyroid hormones is very high. So, when the thyroid hormone (T3 and T4) levels decrease, the pituitary gland is stimulated to release TSH and this high TSH level, in turn, stimulates thyroid gland to release more thyroid hormone (T3 & T4) from the thyroid gland and the vice-versa happens when the thyroid hormone levels are very high.

Cholesterol is essential for life, as it is required by the body to work properly. It plays a role in the formation of cell membranes in all organs and tissues in the body. It is associated with the formation of hormones which are important for development, growth, and reproduction. It forms bile acids, which help to absorb nutrients from food. 

In the blood, a small amount of cholesterol circulates in the form of lipoproteins which contains protein, cholesterol, triglyceride, and phospholipid molecules. These are classified according to their density into HDL (high-density lipoproteins), LDL (low-density lipoproteins), and VLDL (very low-density lipoproteins). HDL cholesterol is also known as good cholesterol, as it carries excess cholesterol away for disposal while LDL cholesterol is also known as bad cholesterol, as it deposits cholesterol in tissues and organs. 

It is important to maintain and monitor the levels of cholesterol for a healthy lifestyle. The source of cholesterol is diet as well. If a person is taking too much of cholesterol-rich foods, it can cause a rise in levels of cholesterol in the blood. The amount of cholesterol which is not required by the body starts to deposit in the form of plaques on the walls of blood vessels. These plaques can narrow or block the blood vessels opening which can lead to the hardening of arteries known as atherosclerosis. Also, with an increase in cholesterol levels, there is an increased risk of various conditions such as heart disease and stroke. 

Glycosylated Hemoglobin Test measures the percentage of glycosylated hemoglobin in blood which reflects the average blood glucose over a period of past two to three months (8 - 12 weeks).

Hemoglobin is the protein found in Red Blood Cells and is responsible for transporting oxygen. Of the different types of hemoglobin, Hemoglobin A is predominant. With the elevation of blood sugar levels, some glucose binds spontaneously to Hemoglobin A (this binding is called Glycosylation or Glycation) and remains bound for the complete lifetime of the RBC, which is 120 days normally. Higher the level of glucose in the blood, greater is the amount of it binding to Hemoglobin A. Hemoglobin A1c is the dominant form of Glycated Hemoglobin. As RBCs die and are replaced, Hemoglobin A1c is cleared and slowly replaced with non-glycosylated hemoglobin. Measurement of HbA1c level over a period of time gives an indication of the level of glucose in the blood over the specified period of time. This helps in the diagnosis of Diabetes and is useful for monitoring the effectiveness of measures taken to reduce blood sugar levels.