Blood tests for triglycerides are usually part of a lipid profile that is used to help identify an individual's risk of developing heart disease and to help make decisions about what treatment may be needed if there is borderline or high risk. As part of a lipid profile, it may be used to monitor people who have risk factors for heart disease, those who have had a heart attack, or those who are being treated for high lipid and/or high triglyceride levels.

Results of the cholesterol test and other components of the lipid profile are used along with other known risk factors of heart disease to develop a plan of treatment and follow-up. Treatment options may include lifestyle changes, such as diet or exercise programs, or lipid-lowering drugs, such as statins.

Adults

A lipid profile, which includes triglycerides, is recommended every 4 to 6 years to evaluate risk of heart disease in healthy adults. Children should have a lipid profile screening at least once between the ages of 9 and 11 and once again between the ages of 17 and 21.

Testing may be ordered more frequently when people have identified risk factors for heart disease. Some risk factors for heart disease include:

• Cigarette smoking
• Being overweight or obese
• Unhealthy diet
• Being physically inactive—not getting enough exercise
• Age (men 45 years or older or women 55 years or older)
• High blood pressure (hypertension—blood pressure of 140/90 or higher or taking high blood pressure medication)
• Family history of premature heart disease (heart disease in an immediate family member—male relative under age 55 or female relative under age 65)
• Pre-existing heart disease or already having had a heart attack
• Diabetes or prediabetes

For diabetics, it is especially important to have triglycerides measured as part of any lipid testing since triglycerides increase significantly when blood glucose levels are not well-controlled.

Youth

Screening for high cholesterol as part of a lipid profile is recommended for children and young adults. They should be tested once between the ages of 9 and 11 and then again between the ages of 17 and 21. Earlier and more frequent screening with a lipid profile is recommended for children and youths who are at an increased risk of developing heart disease as adults. Some of the risk factors are similar to those in adults and include a family history of heart disease or health problems such as diabetes, high blood pressure, or being overweight.

High-risk children should have their first cholesterol test between 2 and 8 years old, according to the American Academy of Pediatrics. Children younger than 2 years old are too young to be tested.

Monitoring

As part of a lipid profile, triglycerides tests may be ordered at regular intervals to evaluate the success of lipid-lowering lifestyle changes, such as diet and exercise, or to determine the effectiveness of drug therapy such as statins. Guidelines from the American College of Cardiology and the American Heart Association recommend that adults taking statins have a fasting lipid profile done 4 to 12 weeks after starting therapy and then every 3 to 12 months thereafter to assure that the drug is working.

In general, healthy lipid levels help to maintain a healthy heart and lower the risk of heart attack or stroke. A healthcare practitioner will take into consideration the results of each component of the lipid profile as well as other risk factors to help determine a person's overall risk of heart disease, whether treatment is necessary and, if so, which treatment will best help to lower the person's risk.

In 2002, the National Cholesterol Education Program (NCEP) Adult Treatment Panel III (ATPIII) provided the guidelines for evaluating lipid levels and determining treatment. In 2013, the American College of Cardiology and the American Heart Association issued guidelines for adults that made recommendations on who should receive cholesterol-lowing therapy. (For more details, see the Lipid Profile article).

However, use of the updated guidelines remains controversial. Many still use the older guidelines from the NCEP ATP III to evaluate lipid levels and cardiovascular disease risk:

For adults, triglyceride test results are categorized as follows:

• Desirable: Less than 150 mg/dL (1.7 mmol/L)
• Borderline high: 150 to 199 mg/dL (1.7-2.2 mmol/L)
• High: 200 to 499 mg/dL (2.3-5.6 mmol/L)
• Very high: Greater than 500 mg/dL (5.6 mmol/L)

For children, teens and young adults:

From newborn to age 9

• Acceptable: Less than 75 mg/dL (0.85 mmol/L)
• Borderline high: 75-99 mg/dL (0.85-1.12 mmol/L)
• High: Greater than 100 mg/dL (1.13 mmol/L)

For ages 10-19 years

• Acceptable: Less than 90 mg/dL (1.02 mmol/L)
• Borderline high: 90-129 mg/dL (1.02-1.46 mmol/L)
• High: Greater than 130 mg/dL (1.47 mmol/L)

For young adults older than 19

• Acceptable: Less than 115 mg/dL (1.30 mmol/L)
• Borderline high: 115-149 mg/dL (1.30-1.68 mmol/L)
• High: Greater than 150 mg/dL (1.7 mmol/L)

When triglycerides are very high (greater than 1000 mg/dL (11.30 mmol/L)), there is a risk of developing pancreatitis in children and adults. Treatment to lower triglycerides should be started as soon as possible.

If you are diabetic and your blood sugar (glucose) is out of control, triglycerides may be very high.

Triglycerides change dramatically in response to meals, increasing as much as 5 to 10 times higher than fasting levels just a few hours after eating. Even fasting levels vary considerably day to day. Therefore, modest changes in fasting triglycerides measured on different days are not considered to be abnormal.

Certain drugs such as corticosteroids, protease inhibitors for HIV, beta blockers, and estrogens can increase blood triglyceride levels.

There is increasing interest in measuring triglycerides in people who have not fasted. The reason is that a non-fasting sample may be more representative of the "usual" circulating level of triglyceride since most of the day blood lipid levels reflect post-meal (post-prandial) levels rather than fasting levels. However, it is not yet certain how to interpret non-fasting levels for evaluating risk so, at present, there is no change in the current recommendations for fasting prior to tests for lipid levels.