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.
When measuring total cholesterol levels, low-density lipoprotein (LDL), high-density lipoprotein (HDL), and triglycerides are used in the measurement. For adults, standard cholesterol levels are: 1  Less than 200 mg/dL is desirable.2  Between 200 - 239 mg/dL is considered borderline. 3  Over 240 mg/dL is considered high.or adults, standard cholesterol levels are: 1  Less than 200 mg/dL is desirable. 2  Between 200 - 239 mg/dL is considered borderline. 3  Over 240 mg/dL is considered high.