The meaning and the normal range of blood test indicators

Glucose
Glucose is the basic sugar needed to provide energy for all parts of the body. Glucose is the primary source of energy for the body's cells, and blood lipids (in the form of fats and oils) are primarily a compact energy store. Glucose is transported from the intestines or liver to body cells via the bloodstream, and is made available for cell absorption via the hormone insulin, produced by the body primarily in the pancreas.

if blood sugar levels drop too low, a potentially fatal condition called hypoglycemia develops. Symptoms may include lethargy, impaired mental functioning; irritability; shaking, twitching, weakness in arm and leg muscles; pale complexion; sweating; paranoid or aggressive mentality and loss of consciousness. brain damage is even possible.

Clinical Adult Range : 70 mg/dL - 115 mg/dL
Sodium
A sodium test checks how much sodium (an electrolyte and a mineral) is in the blood. Sodium is both an electrolyte and mineral. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body. Sodium is also important in how nerves and muscles work.

Sodium is an essential nutrient that regulates blood volume, blood pressure, osmotic equilibrium and pH; the minimum physiological requirement for sodium is 500 milligrams per day.

Clinical Adult Range : 135 mmol/L - 145 mmol/L
Potassium
A potassium test checks how much potassium is in the blood. Potassium is both an electrolyte and a mineral. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body.

Potassium is also important in low nerves and muscles work. This element is found primarily inside the cells of the body. Low levels in the blood may indicate severe diarrhea, alcoholism, or excessive use of water pills.
Clinical Adult Range : 3.5 mmol/L - 5.0 mmol/L
Magnesium
A magnesium test checks the level of magnesium in the blood. Magnesium is an important electrolyte needed for proper muscle, nerve, and enzyme function. It also helps the body make and use energy and is needed to move other electrolytes (potassium and sodium) into and out of cells.

A magnesium test is used to measure the level of magnesium in the blood. Abnormal levels of magnesium are most frequently seen in conditiona or diseases that cause impaired or excessive excretion.

Clinical Adult Range : 1.7 mg/dL - 2.4 mg/dL
Chloride
A chloride test measures the level of chloride in your blood or urine. Chloride is one of the most important electrolytes in the blood. It helps keep the amount of fluid inside and outside of your cells in balance. It also helps maintain proper blood volume, blood pressure, and pH of your body fluids. Tests for sodium, potassium, and bicarbonate are usually done at the same time as a blood test for chloride. 

Clinical Adult Range : 96 mmol/L - 110 mmol/L
Blood Urea Nitrogen
The blood urea nitrogen (BUN, pronounced "B-U-N") test is a measure of the amount of nitrogen in the blood in the form of urea, and a measurement of renal function. Urea is a by-product from metabolism of proteins by the liver and is removed from the blood by the kidney.

BUN is a waste product derived from protein breakdown in the liver. 

Clinical Adult Range : 10 mg/dL - 26 mg/dL