Identical twins have the same blood type.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that identical twins have the same blood type?

Yes. A 1930s study of 35 twin pairs reports that monozygotic (identical) twins had the same blood group type in all cases, and a 1973 study notes identical twins' similarity in ABO type. A single case report also describes identical twins sharing red blood cell antigens.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked 3 Oct 2026

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Evidence for · 3

Quantitative Studies on Salivary Blood Group Substances III.: In Identical Twins 1

1973

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Quantitative Studies on Salivary Blood Group Substances III.: In Identical Twins 1. (1973). doi.org. https://doi.org/10.1111/j.1423-0410.1973.tb05211.x

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More for · 2

Systemic lupus erythematosus in identical twins: a case report

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Systemic lupus erythematosus in identical twins: a case report. (n.d.). cir.nii.ac.jp. https://doi.org/10.1007/s10165-004-0365-7

雙胎ノ生物學的知見増補其1 雙胎ノ血液型

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雙胎ノ生物學的知見増補 其1 雙胎ノ血液型. (n.d.). ousar.lib.okayama-u.ac.jp. https://ousar.lib.okayama-u.ac.jp/46060

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