Our standards
Every article and calculator on this site aims to be accurate, current, clearly sourced and easy to understand. We describe the standard ABO/Rh model faithfully, state its limits explicitly, and avoid overstating what blood type can tell you.
Editorial responsibility
Bobby Litmon operates BloodTypeCalc.com and is responsible for publishing, maintenance and the correction process. The site byline identifies our educational publication; it is separate from a credentialed clinical review. Source links identify where a statement comes from and should not be read as an endorsement of this site by those organizations.
Sourcing
We rely on primary and authoritative secondary sources: national blood services (American Red Cross), government health libraries (MedlinePlus), professional bodies (ACOG) and peer-reviewed journals. Sources are listed at the end of each article and collected on the sources page. Where evidence is weak or contested, as with blood type personality and diet theories, we say so.
Review
Content is published by BloodTypeCalc.com and fact-checked against the sources cited. We do not currently claim independent clinical review, and we do not list named reviewers or credentials we cannot substantiate. A reviewer byline will appear on a page only when a named, credentialed reviewer has actually checked it.
Calculator accuracy
Calculation logic is implemented as a standalone library with automated checks for known ABO/Rh inheritance examples, genotype enumeration, probability ranges, unknown inputs, reverse lookups and compatibility rules. Software tests check the implementation against the stated model; they are not independent clinical validation. The methods and worked examples explain why uncertain genotypes produce ranges rather than a single averaged figure.
Updates
Each page shows its publication and last-updated dates. We review content when guidelines change or when readers report an issue.
October 12, 2026: added the named publisher, a detailed calculator-methods page and worked genotype examples, clarified software testing versus clinical review, and corrected the About page's contact instructions. This is an editorial and methods update; it does not establish a new clinical review of all articles.
Advertising
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Corrections
If you find an error, please contact us. We correct factual errors promptly and note substantive changes by updating the page date.