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 numbers (as the name implies) measure the total amount of cholesterol in the bloodstream. These numbers combine levels for HDL, LDL, and another type of cholesterol known as VLDL, or very low-density lipoprotein. However, these numbers can be misleading because a person can have a healthy total cholesterol reading and still have low HDL or high LDL. Therefore, most cholesterol treatment decisions are based on HDL and LDL cholesterol numbers, not total numbers.