Iterative model for the calculation of oxyhemoglobin, methemoglobin, and bilirubin in absorbance spectra of cerebrospinal fluid.

References 1. Bianchi DW, Flint AF, Pizzimenti MF, Knoll JH, Latt SA. Isolation of fetal DNA from nucleated erythrocytes in maternal blood. Proc Natl Acad Sci U S A 1990;87:3279–83. 2. Lo YMD, Corbetta N, Chamberlain PF, Rai V, Sargent IL, Redman CWG, Wainscoat JS. Presence of fetal DNA in maternal plasma and serum. Lancet 1997;350:485–7. 3. Lo YMD, Tein MSC, Lau TK, Haines CJ, Leung TN, Poon PMK, et al. Quantitative analysis of fetal DNA in maternal plasma and serum: implications for noninvasive prenatal diagnosis. Am J Hum Genet 1998;62:768–75. 4. Livak KJ, Flood SJA, Marmaro J, Giusti W, Deetz K. Oligonucleotides with fluorescent dyes at opposite end provide a quenched probe system useful for detecting PCR product and nucleic acid hybridization. PCR Methods Appl 1995;4:357–62. 5. Lo YMD, Lau TK, Zhang J, Leung TN, Chang AMZ, Hjelm NM, et al. Increased fetal DNA concentrations in the plasma of pregnant women carrying fetuses with trisomy 21. Clin Chem 1999;45:1747–51. Iterative Model for the Calculation of Oxyhemoglobin, Methemoglobin, and Bilirubin in Absorbance Spectra of Cerebrospinal Fluid, Hendrik J. Duiser, Freek W.C. Roelandse, Eef G.W.M. Lentjes, Jenny van Loon, John H.M. Souverijn, and Augueste Sturk (Department of Clinical Chemistry, Leiden University Medical Centre, Albinusdreef 2, 2333 ZA Leiden, The Netherlands; * author for correspondence: fax 31-71-5266753, e-mail froelandse@ lumc.nl)