Editorial and medical-review policy
How content is written
- Every medical statement cites a source we read: peer-reviewed research (PubMed abstracts and Cochrane reviews), guidelines, and pages from public health bodies (WHO, NIH, NHS) and hospital programs. Sources were last checked on Nov 7, 2026.
- We prefer conservative wording. We quote numbers only when the cited source states them, and we point out when evidence is mixed.
- We describe people's reasons for declining blood respectfully and neutrally. We don't debate religious beliefs.
Medical review: not done yet
Honest status: this content has not yet been reviewed by a clinician. We plan to have it reviewed by a qualified medical professional and will name the reviewer and review date on each page when that happens. Until then, treat it as a reading guide to the sources, not as medical advice.
Not medical advice
Nothing on this site is medical advice. Decisions about tests, treatment and transfusion should be made with your own care team, who know your health and your wishes.
Independence
We aren't affiliated with or funded by any hospital, manufacturer, medical society or religious organization. Hospital programs we link to are examples, not endorsements. We don't currently carry advertising or sponsorship; if that changes, we'll say so here.
Corrections
If you spot an error or an outdated source, let us know and we'll check it against the original and update the page.
Talk to your care team. This page summarizes published research and patient information for general education. It is not medical advice and has not yet been reviewed by a clinician. Your surgeon, anesthesiologist or doctor can tell you what applies to you.