Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.

• Aa condition when it is present and indicate that there is one  
• Bwhen a condition is present and indicate that there is one  
• Ca condition when it is present and indicate that it is present  
• Dwhen a condition is present and indicate its presence  
• Ethe presence of a condition when it is there and indicate its presence