Question

proper checking of blood before blood donation what can be achieved/prevented

Answer 1

prevention of donation of your disease to the receiver and realisation of your health condition

Answer 2

Eat a healthy meal before your donation. Avoid fatty foods, before donating. Tests for infections done on all donated blood can be affected by fats that appear in your blood for several hours after eating fatty foods. As a bonus, try to ensure that the foods you are eating are iron-rich