Under 50 kg, why the scale says wait

The scale at the donation camp is not judging you, it’s doing arithmetic. A standard donation takes 350,450 ml, and that volume is calibrated to body weight. Below 50 kg, the safe amount becomes too small to process into a usable unit. The rule exists to protect you, full stop. ## The math, briefly Blood is roughly 7,8% of body weight. At 50 kg, that’s about 3.5,4 litres, meaning a 450 ml draw is a meaningful slice of your circulating volume. Below that weight, the same draw is a bigger slice than your body should comfortably spare, and a smaller draw often can’t yield a full usable unit. So the floor protects two people at once: you, and the patient. ## “I’m 48 kg and perfectly healthy” You may well be. But eligibility isn’t about healthy, it’s about safe-to-draw today. Plenty of healthy people are deferred: low haemoglobin that day, a recent fever, under 50 kg. Deferral is the system declining to take a risk on your behalf. ## What you can do 1. Build weight the real way, calorie-dense nutritious food: nuts, dairy, eggs, bananas, rice, dal with ghee. Strength exercise converts it to the right kind of weight. 2. Get help if weight won’t move, a doctor’s check can catch thyroid or absorption issues. 3. Come back, the register doesn’t expire. When you cross 50 kg, your two minutes count as much as anyone’s. And meanwhile: you can still recruit. Persuading one eligible friend to register does more good today than an ineligible donation ever could. Register when you’re ready →, the couch knows how to wait. ## Explore The full eligibility hub → · what happens at donation → · how much blood is taken →