What happens when you give blood
summary
About 40–60 donations totaling roughly two gallons lead into a routine: stop taking aspirin 48 hours before, make an appointment or walk in, show photo ID, and fill a confidential questionnaire about travel and disease exposure (mad cow, HIV, UK residency). A nurse checks vitals, does a finger prick for hematocrit, finds and sterilizes a vein, applies a cuff, inserts a needle and collects a pint while an automated scale shuts off after a pint. Tubes get tested, then bandage, rest with snacks for 5–10 minutes, hydrate, and avoid heavy lifting or alcohol for a couple days.
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