- You have to be healthy, fit, and not suffering from a current illness.
- Avoid donating blood if you have a cold, a cold sore, a cough, a virus, or an upset stomach.
- Certain prescribed medications, such as antibiotics, can make you ineligible to donate blood.
- You must weigh at least 110 pounds or 50 kg.
- You have to be old enough. In many jurisdictions, parental permission is required for the ages 16–17 to give blood. .
- You can only donate blood every 56 days.
- If you have donated blood more recently than that, then you are not eligible again.
- Do not give blood if you have had simple dental work done within 24 hours or major dental work in the past month.
- Dental work in general can place one at risk for dislodging bacteria. This bacteria can get into blood stream and cause systemic infection.