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How to donate blood: the complete step-by-step (first time to biscuits)

The full donation walkthrough: before, registration, screening, haemoglobin test, the 8-10 minutes of donation, refreshments, after. Know every step before you sit down.

The unknown is scarier than the needle. Here is the entire process, step by step, so nothing surprises you:

Before you arrive

  • Eat a full meal 2-3 hours earlier (never donate empty-stomached)
  • Drink 2-3 glasses of water
  • Carry any photo ID
  • Alcohol-free for 24 hours; feeling well

Step 1 — Registration (5 minutes)

Name, contact, a few history questions on a form. ID checked. You get a donor card or number.

Step 2 — Screening (10 minutes)

A staff member privately reviews your answers: health, medicines, travel, tattoos, last donation. This is where honesty saves two lives — yours and the patient’s.

Step 3 — Haemoglobin + BP (2 minutes)

A finger-prick test (12.5 g/dL to pass) and a BP reading (around 140/90 or lower to pass). Clear both and you are on the donation couch.

Step 4 — The donation itself (8-10 minutes)

A new, sterile, single-use needle goes into your arm — one quick pinch. Then you squeeze a soft ball every few seconds while 350-450 mL fills a bag beside you. Most donors scroll their phones and are surprised when it ends.

Step 5 — Bandage + refreshments (15 minutes)

Needle out, pressure bandage on, and you are walked to the refreshment corner. Take the tea/juice and the biscuits — they are part of the medicine. Sit for 15 minutes; stand up only when you feel steady.

Step 6 — After

Water through the day, a proper meal, no gym or heavy lifting with that arm today, no alcohol today. Log it — the register tracks your interval and calls you back on the right day.

That is the whole thing. Thirty to forty-five minutes, four times a year, for a life.

People also ask

How long does the whole donation take?

About 30-45 minutes end to end. The needle-to-bandage part is only 8-10 minutes; the rest is registration, screening and the refreshments you should not skip.

Does the needle hurt?

A quick pinch for a second at insertion — most donors say the anticipation is the worst part. The 8-10 minutes of collection are painless.

How much blood do they take?

350 or 450 mL — under a tenth of your body's total, which your body fully rebuilds.

About this article

Written by Assam Blood Donor team. Medical review: pending, content follows published national (NBTC/NACO) guidance and is for general education, not personal medical advice. Last updated 5 Sept 2026.

Sources: standard donation-centre process · NBTC donor care

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