Prenatal Diagnosis of Fetal RhD Status by Molecular Analysis of Maternal Plasma
Y.M. Dennis Lo, M.R.C.P., N. Magnus Hjelm, F.R.C.Path., Carrie Fidler, Ph.D., Ian L. Sargent, Ph.D., Michael F. Murphy, F.R.C.Path., Paul F. Chamberlain, M.D., Priscilla M.K. Poon, Ph.D., Christopher W.G. Redman, F.R.C.P., and James S. Wainscoat, F.R.C.Path.
Background The ability to determine fetal RhD status noninvasivelyis useful in the treatment of RhD-sensitized pregnant womenwhose partners are heterozygous for the RhD gene. The recentdemonstration of fetal DNA in maternal plasma raises the possibilitythat fetal RhD genotyping may be possible with the use of maternalplasma.
Methods We studied 57 RhD-negative pregnant women and theirsingleton fetuses. DNA extracted from maternal plasma was analyzedfor the RhD gene with a fluorescence-based polymerase-chain-reaction(PCR) test sensitive enough to detect the RhD gene in a singlecell. Fetal RhD status was determined directly by serologicanalysis of cord blood or PCR analysis of amniotic fluid.
Results Among the 57 RhD-negative women, 12 were in their firsttrimester of pregnancy, 30 were in their second trimester, and15 were in their third trimester. Thirty-nine fetuses were RhD-positive,and 18 were RhD-negative. In the samples obtained from womenin their second or third trimester of pregnancy, the resultsof RhD PCR analysis of maternal plasma DNA were completely concordantwith the results of serologic analysis. Among the maternal plasmasamples collected in the first trimester, 2 contained no RhDDNA, but the fetuses were RhD-positive; the results in the other10 samples were concordant (7 were RhD-positive, and 3 RhD-negative).
Conclusions Noninvasive fetal RhD genotyping can be performedrapidly and reliably with the use of maternal plasma beginningin the second trimester of pregnancy.
Source Information
From the Department of Chemical Pathology, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (Y.M.D.L., N.M.H., P.M.K.P.); and the Department of Hematology (C.F., M.F.M., J.S.W.) and the Nuffield Department of Obstetrics and Gynecology (I.L.S., P.F.C., C.W.G.R.), John Radcliffe Hospital, Oxford, United Kingdom.
Address reprint requests to Dr. Lo at the Department of Chemical Pathology, Rm. 38023, Clinical Sciences Bldg., Prince of Wales Hospital, 3032 Ngan Shing St., Hong Kong, China.
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