Question 1

When can I donate blood again?

Accepted Answer

It depends on your country and donation type. For whole blood: the American Red Cross allows donation every 56 days; the UK NHSBT allows men every 12 weeks (84 days) and women every 16 weeks (112 days); India's NBTC allows men every 3 months (90 days) and women every 4 months (120 days). donorbook adds your interval to your last-donation date to give the exact next-eligible date. The blood bank's on-site screening always decides.

Question 2

Am I eligible to donate blood?

Accepted Answer

Common baseline criteria are a minimum age (17 in the US and UK, 18 in India), a minimum weight (about 50 kg / 110 lb in the US and UK, 45 kg in India) and adequate haemoglobin. Recent tattoos, illness, pregnancy, travel to malaria areas, surgery and many medications can defer you. donorbook runs a pre-check against the published general rules, but any medication or detailed-history question resolves to 'ask the blood bank' — it never confirms eligibility.

Question 3

Does donorbook send my donation history anywhere?

Accepted Answer

No. donorbook runs entirely in your browser and its Content-Security-Policy sets connect-src 'none', so the page cannot make any network request even if it tried. Your logbook lives only in this browser's localStorage; clearing site data erases it, so the CSV and print exports are your only backup.

Blood donation eligibility check & next-donation-date calculator — a private donor logbook

When can I donate blood again?

Guided eligibility pre-check

Your private donor logbook

Blood-group compatibility explorer

Can donate to

Can receive from

The full ruleset & its sources