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.
Total Cholesterol. Total cholesterol is the sum of all cholesterol in the blood. Even if your total cholesterol is below 200 mg/dL, you may still be at risk for heart disease if your individual lipid measures are not within recommended levels.otal Cholesterol. Total cholesterol is the sum of all cholesterol in the blood. Even if your total cholesterol is below 200 mg/dL, you may still be at risk for heart disease if your individual lipid measures are not within recommended levels.