Jiwark guides
Guides to blood donation and blood types
Short, clear answers to what people ask most about giving blood and blood types, based on international medical sources listed at the end of each guide.
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Donating Blood While Fasting in Ramadan: Is It OK and When Is Best?
Can you give blood in Ramadan? The Saudi Ministry of Health advises donating after iftar. The best time, tips before and after, and when to wait.
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Donating Blood With High Blood Pressure or Diabetes
Can you give blood with high blood pressure or diabetes? The blood pressure limit, and whether BP medicine or insulin stops you, per the Red Cross.
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What to Eat and Do After Giving Blood: Iron, Fluids and Rest
After giving blood: rest 15 minutes, drink extra fluids, avoid hard exercise and eat iron-rich food with vitamin C. The food list, and what blocks iron.
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How Blood Donation Works: Each Step and How Long It Takes
Giving blood step by step: registration, a quick check-up, about half a litre drawn in 8 to 10 minutes, then rest. About an hour in all, with tips.
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Is Giving Blood Safe? Side Effects and Common Myths
Is donating blood bad for you? It is safe for healthy donors: new sterile needles, a check-up each time, and the body replaces it. Side effects and myths.
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The Rarest and Most Common Blood Types, and the Universal Donor
O negative is the universal red cell donor, AB the universal plasma donor, AB positive the universal recipient. How common each type is, and why it varies.
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Rh-Negative Mother, Rh-Positive Father: Risks and the Anti-D Injection
When does an Rh difference between mother and baby matter? Why a first baby is usually fine, and when the anti-D injection (such as RhoGAM) is given.
Free tools for donors
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Can I donate blood today?
Answer a few short questions and see whether you can donate now, and if not, why and when.
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When can I donate again?
Enter your last donation date and see the day you can donate again.
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Child’s blood type predictor
Pick both parents’ blood types to see which types the child can and cannot have.
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Blood type compatibility chart
Pick a blood type to see who it can help and who it can receive from. Share the link with a type picked to show someone their matches.