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16 J. Fam. L. 543 (1977-1978)
Resolution by HLA Testing of 1000 Paternity Cases Not Excluded by ABO Testing

handle is hein.journals/branlaj16 and id is 551 raw text is: RESOLUTION BY HLA TESTING OF
1000 PATERNITY CASES NOT
EXCLUDED BY ABO TESTING
by Paul I. Terasaki*
I. INTRODUCTION
A revolution in paternity testing is currently underway
with the introduction of HLA testing. The HLA system of
tissue types is so powerful in determining the probability of
paternity that many of the older rules of evidence for blood
tests in disputed paternity cases now require complete revi-
sion.
Generally, it has been assumed by American courts that
blood testing is only valid for exclusion of paternity. This
conclusion is based on the fact that when the putative father
is not excluded by ABO testing, his chances of actually being
the father are not usually high. Thus, for purposes of blood
test evidence, any random male could have been the father
almost as easily as the nonexcluded putative father. With
HLA testing, the probability of a nonexcluded male being
the actual father is usually over 90%.
This high degree of discrimination in either excluding or
including, with a high probability, a given male is a result
of the extreme diversity of HLA types in the population.
* B.A., 1950; M.A., 1952; Ph.D., 1956; University of California at Los Angeles,
Professor of Surgery, School of Medicine, UCLA; member World Health Organiza-
tion Nomenclature Committee for Leukocyte Antigens; member of editorial boards
of several scientific journals including the Journal of Immunogenetics. The author
is an internationally recognized authority on histocompatibility immunology and
has written over 350 papers on HLA. He was the 1977 recipient of the Philip Levine
Award of the American Society of Clinical Pathology for outstanding contributions
to the field of blood grouping immunology.
The author wishes to acknowledge the critical aid in performing this work and
in gathering the data received from Dr. Domenico Bernoco, Dr. M.R. Mickey, Mr.
David Gjertson, Ms. Judy Bond, and Mrs. Sondra Perdue.
For the legal implications of HLA testing for paternity, see introductory mate-
rial 16 J. FAM. L. 537 (1977-78) (in this issue).

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