Claim: Your blood type determines your personality

First requested: April 30, 2026 at 10:14 AM
19%

IsItCap Score

Truth Potential Meter

Not Credible

AI consensusWeak

Grader consensus is weak.
Range 10%–50% (spread Δ40).
The graders diverge. Treat the combined score as uncertain and read the sources carefully.
Read analysis summary

OpenAI Grade

0%
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80%
10%

Perplexity Grade

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10%

Google Gemini Grade

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50%

Analysis Summary

The claim that your blood type determines your personality is false. This belief, prevalent in some cultures like Japan, is considered a pseudoscience by the scientific community. Researchers emphasize that there is no empirical evidence supporting a link between blood type and personality traits. While some sources may present personality traits associated with blood types, they do so without scientific backing, treating the theory as factual despite its lack of validity. Critics argue that these associations are mere stereotypes rather than scientifically proven facts. The models diverge sharply — treat this as higher-uncertainty. Gemini comes in highest (50%), while OpenAI is lowest (10%). OpenAI expresses higher confidence than Gemini on this claim. Some sources discuss blood type personality traits as if they are factual, listing specific characteristics associated with each blood type. However, these claims lack scientific validation and are often presented in a cultural context rather than as established science. The existence of these alternative views does not change the overall verdict, as the predominant scientific consensus remains that there is no credible evidence linking blood type to personality. The presence of anecdotal claims does not substantiate the theory.
Jump to source analysis

Source quality

Truth (from sources)1.00 / 10
Source reliability3.00 / 10
Source independence4.00 / 10

Claim checks

Fits established facts2.00 / 10
Logical consistency3.00 / 10
Expert consensus1.00 / 10
Related fact checks

Source Analysis

Common arguments
Supporting the claim
  • Theory is culturally popular in Japan, used for compatibility and fun stereotypes.
  • Blogs list consistent traits like Type A as shy/organized across sources.
  • Some sites cite famous people examples matching blood type personalities.
Against the claim
  • Wikipedia calls it pseudoscience, superstition with no empirical support.
  • NHS Blood Donation implies skepticism, notes no scientific backing.
  • Scientific community rejects link between blood type and personality.

Mainstream Sources

Publication

en.wikipedia.org

Title

Blood type personality theory - Wikipedia

Summary

Describes blood type personality theory as a pseudoscientific belief prevalent in East Asia, considered a superstition by the scientific community, originating from 1970s publications and lacking empirical support.

Source details

Type: Major Media
Secondary Reporting

URL

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Publication

www.blood.co.uk

Title

Is your personality linked to your blood group? - NHS Blood Donation

Summary

Discusses the Japanese belief in blood type personality links but implies skepticism through reference to a self-assessment survey, without endorsing scientific validity.

Source details

Type: Primary
Secondary Reporting

URL

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Alternative Sources

Publication

notesofnomads.com

Title

Blood Type Personality: What does your blood type say about you?

Summary

Popular blog outlining personality traits for each blood type (A: organized, shy; B: easy-going; O: confident; AB: creative), treating the theory as factual with compatibility notes.

Source details

Type: Blog
Low EvidenceOpinion

URL

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Publication

www.betterhelp.com

Title

Is Blood Type Personality Real? - BetterHelp

Summary

Describes traits for each blood type (e.g., A: sensitive; B: adventurous; O: optimistic; AB: rational) as per the theory, questioning if it's real but listing traits extensively.

Source details

Type: Blog
Low Evidence

URL

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Publication

www.masksheets.com

Title

Korean Blood Type Personality Traits - Masksheets

Summary

Details Korean cultural stereotypes for blood types (B: passionate, selfish; AB: rational; O: confident), noting they are generalizations for fun.

Source details

Type: Blog
Low Evidence

URL

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Analysis Breakdown

True/False Spectrum (1.0)Source Credibility (3.0)Bias Assessment (4.0)Contextual Integrity (2.0)Content Coherence (3.0)Expert Consensus (1.0)23%

How to read the breakdown

Weakest areas
Truth1.0/10Consensus1.0/10
  • Truth: how well sources support the core claim.
  • Source reliability: whether the sources have a strong track record.
  • Independence: whether coverage looks one-sided or recycled.
  • Context: missing details (timeframe, definitions, scope) that change meaning.
  • Tip: if graders disagree, rely more on the summary + sources than the single number.

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Methodology