Blood plasma is the colorless, liquid part of the blood and lymphatic fluid that contains life-saving antibodies and proteins. To earn extra cash and possibly to help them out of a pinch in a tough economy, people have discovered they can make an extra $200 to $400 a month selling plasma to blood centers.

Step 1

Determine if you are a candidate. You must be 18 years old and at least 110 lbs. You must have state-issued identification, a Social Security card or legal certification from the Department of Social Services.

Step 2

Go to a local plasma center. Before selling plasma, you will go through a screening process, which takes about two hours. You present medical history and are tested for blood-borne diseases. The actual process of giving plasma takes about an hour.

Step 3

Receive compensation. The compensation for giving plasma is from $25 to $50 per donation depending on location and amount.

Step 4

If you receive $25 per donation and if you give plasma twice during a seven day period (the maximum) you would receive $200 a month. If you receive $30 per plasma donation and you donate plasma twice a week, you would receive $240 a month. If you receive $50 per plasma donation and you give plasma twice every seven days you could receive $400 a month.