Low-Density Lipoprotein Cholesterol (LDL-C) from Serum

Why This Test Matters

LDL cholesterol is often called the 'bad' cholesterol because high levels increase your risk of plaque buildup in your arteries, which can lead to heart attacks or strokes. Your doctor may order this test to assess your cardiovascular health, especially if you have risk factors like high blood pressure, diabetes, or a family history of heart disease.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test. Bring any medications you’re currently taking, as some (like statins) may affect your results. Your blood will be drawn from a vein in your arm, similar to a routine blood test.

What the Results Mean

Results help doctors determine if your LDL cholesterol is within a healthy range. While exact reference ranges vary by lab, higher levels may signal the need for lifestyle changes or medications to lower cholesterol. Your doctor will discuss these findings with you in detail.

Common Causes of Abnormal Results

High LDL cholesterol can result from poor diet (high in saturated fats), lack of physical activity, obesity, smoking, or genetic factors. Conditions like diabetes or hypothyroidism may also influence levels. Low LDL may occur if your body naturally breaks down cholesterol efficiently or if certain medications are affecting it.