Pneumothorax - In a pneumothorax, air collects in the pleural cavity. It may be caused by trauma to the chest, chest surgery, and COPD among other causes. When a pneumothorax is small, it may simply be observed to see if the air is reabsorbed.
This ratio is determined by dividing the HDL cholesterol into the total cholesterol. If a person has a total cholesterol of 200 mg/dL and an HDL cholesterol of 40 mg/dL, his or her total/HDL cholesterol ratio would be 5:1. The goal is to keep this ratio below 5:1, with the ideal being below 3.5:1.his ratio is determined by dividing the HDL cholesterol into the total cholesterol. If a person has a total cholesterol of 200 mg/dL and an HDL cholesterol of 40 mg/dL, his or her total/HDL cholesterol ratio would be 5:1. The goal is to keep this ratio below 5:1, with the ideal being below 3.5:1.
Adding your LDL and HDL levels, and then adding 20% of your triglyceride level will give you your total cholesterol level. The optimal total cholesterol level is less than 200 milligrams per deciliter while 200 to 239 is bordering on high risk. Those with a total cholesterol level of 240 or more are at very high risk.