Normal Cholesterol Levels

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Cholesterol levels

Cholesterol is a substance that is mainly produced by the liver and is made up of fats. It is found naturally throughout the human body and it is required in order for the systems of the body to function properly. The cells of the body use cholesterol to build their membranes, cholesterol aids in digestion, and the body uses it to make bile salts, vitamin D, and hormones.

As the cholesterol travels through the bloodstream the cells take what they need and the excess remains in the bloodstream. It is this extra cholesterol left in the bloodstream that can cause clogged blood vessels and can bring about various heart diseases.

Total Cholesterol
Blood Level Explanation
Less than 200 mg/dL Normal. Lower risk for heart disease.
200 to 239 mg/dL Borderline. More that 200 mg/dL increases your risk.
240 mg/dL and above High. More than doubles the risk for heart disease.

Elevated blood cholesterol has been shown to be a risk factor for the development of heart disease, stroke, and atherosclerotic vascular disease. Some cholesterol is produced by the body while the remainder is received through the diet. Cholesterol is a building block for the adrenal and sex hormones, cell membranes, and bile acids so it is required for proper health, however, it is a fatty substance that is not dissolved in blood and must be carried by protein complexes known as lipoproteins.

Lipoproteins are a combination of a protein and a fat. Total cholesterol is a combined measurement of the three most common lipoprotein carriers: high density lipoprotein (HDL), low density lipoprotein (LDL), and very low density lipoprotein (VLDL).

HDL Cholesterol (good)
Blood Level Explanation
60 mg/dL and above Normal. Considered protective against heart disease.
40 to 59 mg/dL Moderate risk.
Less than 40 mg/dL Low. A major risk factor for heart disease.

HDL is "good cholesterol" because it lowers your risk of atherosclerosis. The body actually makes its own HDL, which can help to remove the excess cholesterol from the bloodstream and tissues.

LDL Cholesterol (bad)
Blood Level Explanation
Less than 100 Normal level. Lowest risk for heart disease.
100 - 129 Low borderline. Low risk.
130 - 159 Borderline. Possible risk.
160 - 189 High borderline. Increased risk for heart disease.
over 190 High. Major risk for heart disease.

LDL is "bad cholesterol" and is associated with atherosclerotic vascular disease. The body cannot use LDL so it can become plaque and clog the arteries.

A healthy diet is very important in the treatment of elevated and unbalanced cholesterol and is an important measure in limiting the risk of heart disease. Patients are encouraged to eat foods low in cholesterol. Foods high in saturated fat should be avoided.

Increased Cholesterol Levels May Be Seen In:

Atherosclerotic vascular disease Familial hyperlipidemias
Uncontrolled diabetes Myocardial infarction
High cholesterol diet Nephrotic syndrome
Primary biliary cirrhosis Hypothyroidism

Drugs That May Increase Blood Cholesterol Levels Include:

ACTH Anabolic steroids
Beta-blockers Thiazide diuretics
Corticosteroids Epinephrine
Phenytoin Birth control pills
Sulfa drugs  

Abnormally Low Cholesterol Levels May Indicate:

Liver impairment Malnutrition
Hyperthyroidism Pernicious anemia
Malabsorption Sepsis

Drugs That May Decrease Blood Cholesterol Measurements Include:

Allopurinol Captopril
Chlorpropamide Colchicine
Colestipol Chlorpropamide
Clofibrate Niacin
Erythromycin Isoniazid
Lovastatin Mao Inhibitors
Neomycin Nitrates
Pravastatin Sodium Probucol
Simvastatin Gemfibrozil
Fluvastatin Cholestyramine
Statins Zetia

Triglycerides

Triglycerides are other fatty substances often measured at the same time as cholesterol, in order to evaluate cardiac risk. They are also carried in the bloodstream via the lipoprotein, very low density lipoprotein (VLDL). Triglycerides can vary from 50 to over 500 mg/dL. An American Heart Association (AHA) study in 1996 found that men and women with triglyceride levels at or above 100 mg per deciliter of blood were 50 percent more likely to have heart conditions than those with lower triglyceride levels. Triglycerides tend to increase with weight gain and decrease with activity.

Normal Triglyceride Levels

Serum Triglyceride Level mg/dl
Less than 150 mg/dL Normal
150 to 199 mg/dL Borderline
200 to 499 mg/dL High
500 mg/dL or more Very High

Elevated Triglycerides May Be Seen in the Following:

Familial hyperlipoproteinemia Poorly controlled diabetes
Cirrhosis Nephrotic syndrome
Hypothyroidism Pancreatitis
Low protein and High carbohydrate diet  

Drugs That May Increase Blood Triglycerides Include:

Cholestyramine Birth control pills
Estrogen  

Low Triglyceride Levels May Be Seen in the Following:

Malabsorption Hyperthyroidism
Malnutrition Low fat diet

Drugs That May Decrease Blood Triglyceride Levels Include:

Ascorbic acid Clofibrate
Asparaginase Colestipol

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