Some laboratories report a ratio of total cholesterol to HDL cholesterol. The ratio is obtained by dividing the total cholesterol by the HDL cholesterol. For example, if a person has a total cholesterol result of 200 mg/dL and an HDL cholesterol level of 50 mg/dL, the ratio would be stated as 4 (or 4:1). A desirable ratio is below 5 (5:1); the optimum ratio is 3.5 (3.5:1).
https://labtestsonline.org/understanding/analytes/hdl/tab/test
An ideal LDL HDL ration is 3.5:1. A higher ration indicates a higher risk of getting a heart attack while a lower ratio shows a lower risk. The calculation is necessary for knowing the risk of getting a heart attack, but it is not important is determining the appropriate treatment to use, as stated by Mayo Clinic.
https://www.reference.com/health/ideal-ldl-hdl-ratio-714bc012fae3ff2b
The test for high-density lipoprotein cholesterol (HDL-C) is used as part of a lipid profile to screen for unhealthy levels of lipids and to determine an individual's risk of developing heart disease and to help make decisions about what treatment to use if there is borderline or high risk.
https://labtestsonline.org/understanding/analytes/hdl/tab/test
How do you calculate the risks of an LDL and HDL cholesterol ratio? The important things used in treatment include the total cholesterol of a person and low density lipoprotein. A person can know his or her cholesterol ratio by dividing total cholesterol by low density lipoprotein. For effective treatment, it is necessary for a person to know his or her exact number of cholesterol levels. A person with low HDL level or elevated LDL level may be at a higher risk.
https://www.reference.com/health/ideal-ldl-hdl-ratio-714bc012fae3ff2b
When using it, the goal is to keep the ratio of HDL/LDL above 0.3, with the ideal being above 0.4. The medical community is divided on the effectiveness of using the ratio to predict the chances of developing heart disease.
http://cholesterol.emedtv.com/hdl/hdl-ldl-ratio.html
To determine how your cholesterol levels affect your risk of heart disease, your doctor will also take into account other risk factors such as age, family history, smoking and high blood pressure. Your total cholesterol score is calculated using the following equation: HDL + LDL + 20 percent of your triglyceride level. HDL (good) cholesterol. With HDL cholesterol, higher levels are better. Low HDL cholesterol puts you at higher risk for heart disease.
http://www.heart.org/HEARTORG/Conditions/Cholesterol/AboutCholesterol/What-Your-Cholesterol-Levels-Mean_UCM_305562_Article.jsp
The ratio of HDL/LDL looks at the ratio of good cholesterol (HDL) to bad cholesterol (LDL). The ratio is determined by dividing the LDL cholesterol into the HDL cholesterol. For example, if a person has an HDL cholesterol of 50 mg/dL and an LDL cholesterol of 150 mg/dL, the HDL/LDL ratio would be 0.33. The goal is to keep the ratio above 0.3, with the ideal HDL/LDL ratio being above 0.4.
http://cholesterol.emedtv.com/hdl/hdl-ldl-ratio.html
People with very low HDL levels or higher LDL levels, even though those levels are in the optimal range may have the ratio out our range and therefore be at substantial risk to Coronary heart disease (heart attacks) . Your blood test only examines the HDL, LDL and Triglycerides level. The Total Cholesterol (TC) and ratio are calculated from the three values. mg/dL (US, Japan, Singapore, India, Israel, most of Asia) mmol/L (UK, Canada, Australia, Ireland, most of Europe)
https://cholesterol-calculator.com/cholesterol-ratio-calculator/
To calculate your cholesterol ratio, divide your high-density lipoprotein (HDL, or good) cholesterol number into your total cholesterol number. An optimal ratio is less than 3.5-to-1. A higher ratio means a higher risk of heart disease. Non-HDL cholesterol, as its name implies, simply subtracts your HDL cholesterol number from your total cholesterol number. So it contains all the bad types of cholesterol. An optimal level of non-HDL cholesterol is less than 130 milligrams per deciliter (mg/dL), or 3.37 millimoles per liter (mmol/L).
http://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/expert-answers/cholesterol-ratio/FAQ-20058006
HDL LDL desired level. Ideally, you want your HDL score to be high, and your LDL and triglyceride scores to be low. The higher your HDL (good Cholesterol), the lower your risk of coronary artery disease. HDL levels greater than 60 mg/dL are optimal. for LDL Less than 100mg/dL is the best.
https://cholesterol-calculator.com/cholesterol-ratio-calculator/
what is your hdl ratio
Your High-Density Lipoprotein ratio is less than 3.5 to 1.