Exams and Tests You will need a blood test to check whether you
have high cholesterol. A total cholesterol test measures whether
your cholesterol is high or low. You can have this test done at
any time, even if you recently had a meal or snack. A lipoprotein
analysis is a more thorough test. It measures your total cholesterol
as well as your LDL, HDL, and triglyceride levels.
It is called a fasting test because you are not supposed to
eat for 12 hours before having your blood drawn. While knowing
your total cholesterol level is important, a lipoprotein test
will help your doctor make certain decisions about your treatment.
Knowing the levels of your good cholesterol (HDL), bad cholesterol
(LDL), and triglycerides will help your doctor decide whether
to prescribe medicine right away or whether you first can try
making changes in your diet and lifestyle to lower your cholesterol.
The following will help you understand the results of your test:
Total cholesterol
|
Best
|
Less than 200 milligrams per deciliter (mg d/L) |
|
Borderline high
|
200 to 239 |
|
High
|
240 or above |
LDL (bad) cholesterol
|
Best
|
Below 100 mg/dL |
|
Near best
|
100 to 129 |
|
Borderline high
|
130 to 159 |
|
High
|
160 to 189 |
|
Very high
|
190 and above |
HDL (good) cholesterol
|
Best
|
60 mg/dL or higher protects against heart disease |
|
Good
|
Above 40 |
|
Bad
|
Below 40 |
Triglycerides
|
Borderline high
|
150 to 199 mg/dL |
|
High
|
200 or more |
During your doctor visit, it will be important to discuss other
things that increase your risk for heart problems, such as smoking,
diabetes, high blood pressure, and a family history of high cholesterol.
You may need other tests to determine whether another health problem,
such as low thyroid, is causing your high cholesterol.
Some medicines may also cause high cholesterol, so it is important
to tell your doctor about everything you take. Along with your
cholesterol levels, your doctor will use this information to determine
your risk for coronary artery disease (CAD) and heart attack.
If you have a high risk of heart disease, or if you already have
heart problems, your doctor will be more likely to prescribe medicine.
For more information, see the topic Coronary Artery Disease. If
you have high cholesterol or high blood pressure, you should get
tested regularly for diabetes. Recent studies show that finding
and treating diabetes early can lower the risk of heart attack.
2
Recently, the American Heart Association (AHA) and the U.S. Centers
for Disease Control and Prevention (CDC) released recommendations
for C-reactive protein (CRP) testing. The AHA/CDC panel recommends
that CRP testing be done on some people who are at risk for developing
coronary artery disease. Ask your doctor if CRP testing would
be helpful in guiding your treatment. 3
Two new studies on CRP levels and statin treatment show that
testing CRP levels may help predict heart attack risk even when
a person has a normal or low level of LDL cholesterol. 4, 5
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