How do I print out lab results?

You should be able to click on the printer icon of the window that shows your test results or result letters. If the printer icon is no longer showing you can make the printer icon reappear by moving your cursor or by pressing the Ctrl and P keys (Ctrl+P) on your keyboard at the same time. 

Clicking the print icon or using Ctrl+P will bring up a box that allows you to select your printer and print your results.