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| Type of intervention | Definition |
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| Motivational | Interventions aimed at increasing motivation toward blood donation |
| Cognitions-based | Interventions targeting psychosocial cognitions related to motivation, such as social norms, attitudes, and barriers |
| Foot-in-the door/door-in-the-face | Interventions using the foot-in-the-door, the door-in-the-face, or a combination of both techniques to motivate individuals to give blood. Foot-in-the-door involves asking a small request that should be accepted and then asking a critical large request. Door-in-the-face involves asking a large request that should be refused and then asking a critical small request |
| Altruism | Interventions using altruistic motives to motivate individuals to give blood |
| Modelling | Interventions showing another person giving blood to motivate individuals to give blood |
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| Reminders/asking | Interventions using direct requests or reminders about the next eligibility date and/or the next appointment to give blood (e.g., telephone call prompt) |
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| Measurement of cognitions | Interventions using the completion of a questionnaire about the intention to give blood to activate cognitions about blood donation (e.g., question-behaviour effect) |
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| Incentives | Interventions using incentives for donating blood such as a T-shirt, money, prizes, tickets, and other |
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| Preventing vasovagal reactions | Interventions to avoid dizziness and fainting, including applied muscle tension during donation, predonation salt loading, on-site stomach distension with liquids, donor distraction techniques, more stringent estimated blood volume requirements for donors under age 23, salty postdonation snacks, intensive education for individuals with higher fear scores |
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