In the context of health, especially for a 33-year-old male, EF typically stands for Ejection Fraction. This is a measurement used to assess how well the heart is pumping blood. It represents the percentage of blood that is pumped out of the heart's left ventricle with each heartbeat.

1. Normal EF Range:

   • Usually between 50% to 70%, indicating good heart function.

2. Lower EF:

   • May suggest heart problems such as heart failure or cardiomyopathy.

If you have come across 'EF' in your medical reports or discussions, it is often related to an echocardiogram or other heart function tests. If you have concerns about your EF or heart health, it is best to discuss the results with your healthcare provider for personalized advice and management.