By: Lili Ryan

HDL (High-Density Lipoprotein)

The "good" cholesterol

  • Removes risk of heart disease
  • Removes harmful cholesterol from where it doesn't belong
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LDL (Low-Density Lipoprotein)

The "bad" cholesterol

  • Raises risk of heart disease
  • Carries fat from the liver to the blood
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  • Particles are more dense
  • The weight in the particle is 20% in cholesterol and 50% in protein


  • Size is bigger
  • The weight in the particle is 50% in cholesterol and 20% in protein



  • Carries cholesterol away from the heart and other organs
  • Deliver to liver where it is passed from your body


  • Bring cholesterol to cells throughout your body and can cause cholesterol to build up within your arteries
  • Can eventually lead to arterial blockage amd increased risk for heart disease

Why do doctors monitor the concentrations of HDL and LDL in patients' blood?

  • Concentrations of HDL and LDL are both monitered to help decrease the patients' risk for heart disease
  • HDL levels should at least be 40mg/dl or closer to 60mg/dl

What other molecules in a patient's blood are monitored along with HDL and LDL?

  • Triglycerides; a type of fat found in the bloodstream inside of cholesterol molecules
  • High levels of triglycerides can cause heart disease