Cuckle H, Arbuzova S, Spencer K, Crossley J, Barkai G, Krantz D, Muller F, Nikolenko M, Aitken D, Hallahan T, Macri J, Buchanan P (2003). Frequency and Clinical Consequences of Extremely High Maternal Serum PAPP-A Levels.  Prenat Diagn 23:385-8

Cusick W, Buchanan P, Hallahan TW, Krantz DA, Larsen JW Jr., Macri JN (2003). Combined First Trimester Versus Second Trimester Serum Screening for Down Syndrome: a Cost Analysis.  Am J Obstet Gynecol 188: 745-51

Orlandi F, Rossi C, Allegra A, Krantz D, Hallahan T, Orlandi E, Macri J (2002).  First Trimester Screening with Free beta-hCG, PAPP-A and Nuchal Translucency in Pregnancies Concieved with Assisted Reproduction.  Prenat Diagn 22: 718-21

Melancon SB, Demczuk S, Zaor S, Pelletier M, Krantz DA, Hallahan TW, Macri JN (2002)  Screening for Aneuploidy Using Maternal Blood Spots in the First Trimester.  Am J Human Genet 71: 558 (suppl.)

Rossi C, Orlandi E, Orlandi F, Krantz D, Hallahan T, Macri J (2002).  Evaluation of Ductus Venosus Blood Flow as a Screening Marker for Down Syndrome.  Am J Hum Genet 71: 559 (suppl.)

Hallahan TW, Krantz DA, Macri JN (2001). First Trimester Screening in Ransom SB, Dombrowski MP, Evans MI, Ginsburgh KA  (Eds.) Contemporary Therapy in Obstetrics and Gynecology, pp 225-228. Philadelphia: W. B. Saunders Co.

Krantz DA, Hallahan TW, Orlandi E, Rossi C, Larsen JW, Buchanan PD, Klein V, Macri JN (2001). First Trimester Down Syndrome Screening in Twins: Moving from "Pseudo-Risk to Real Risk. Am J Human Genet 69, Suppl. A2837.

Melancon SB, Demczuk S, Mercier S, Khalife S, Chiu L, Pelletier M, Miron P, Krantz DA, Hallahan TW, Macri JN, BenKhalifa M (2001). Prenatal Screening for Aneuploidy using Maternal Blood Spots on Filter Paper in the First and Second Trimester. Am J Human Genet 69, Suppl. A2823.

Cusick W, Buchanan P, Hallahan T, Krantz D, Larsen J, Macri JN (2001). A Cost-Effectiveness Analysis of Fetal Down Syndrome Screening: First versus Second Trimester. Am J Obstet Gynecol 184,S112 (Abstract).

Chik L, Chik K, Spencer K, Sokol RJ, Krantz D, Macri JN, Evans MI (2001). Variation in Population Distribution and Its Impact on Likelihood Ratios for Down Syndrome Screening. Am J Obstet Gynecol 184,S111 (Abstract). 

Hallahan T, Krantz D, Orlandi F, Rossi C, Curcio P, Macri S, Larsen J, Buchanan P, Macri J (2000). First Trimester Biochemical Screening for Down Syndrome: Free Beta hCG versus Intact hCG. Prenat Diagn 20:785-89.

Krantz DA, Hallahan TW, Orlandi F, Buchanan P, Larsen JW, Macri JN (2000). First-Trimester Down Syndrome using Dried Blood Biochemistry and Nuchal translucency. Obstet Gynecol 96, 207-213

Orlandi F, Allegra A, Curcio P, Krantz D, Hallahan T, Larsen J, Buchanan P, Macri J (2000). The Effect of In Vitro Fertilization on First Trimester Free Beta hCG and PAPP-A Levels. Am J Obstet Gynecol 182, S191 (Abstract).

Chik L, Chik K, Spencer K, Sokol RJ, Krantz D, Johnson A, Macri JN, Evans MI (2000). An Evaluation of Likelihood Ratios for Downs Syndrome from Maternal Age, Alpha-fetoprotein, and Free Beta Human Chorionic Gonadotrophin. Am J Obstet Gynecol 182, S191 (Abstract).

Macri JN, Krantz DA, Hallahan TW, Larsen JW, Buchanan PD, Orlandi F, Rossi C, Dugoff L (1999). Nuchal Translucency Measurement in Twin Pregnancy. Am J Human Genet 65 (4) Suppl., A367 (Abstract).

Krantz DA, Hallahan TW, Larsen JW, Buchanan PD, Snijders RJM, Klein V, Macri JN (1999). Use of Chorionicity to Refine the Risk of Chromosomal Abnormalities in Twin Pregnancy. Am J Human Genet 65 (4) Suppl., A179 (Abstract).

Hallahan TW, Krantz DA, Buchanan PD, Larsen JW, Macri JN (1999). The Effect of Gravidity and Maternal Age on the First Trimester Down Syndrome Biochemical Markers Free Beta hCG and PAPP-A. Am J Human Genet 65 (4) Suppl., A176 (Abstract).

Hallahan TW, Krantz DA, Tului L, Alberti E, Buchanan PD, Orlandi F, Klein V, Larsen JW, Macri JN (1998) Comparison of Urinary Free Beta (hCG) and Beta-Core (hCG) in Prenatal Screening for Chromosomal Abnormalities. Prenatal Diagn 18, 893-900.

Macri J, Krantz D, Hallahan T, Orlandi F, Rossi C, Curcio P, Macri S, Buchanan P, Larsen J (1998). Down Syndrome Screening with Nuchal translucency: Correlation with Biochemical and Other Maternal Factors. Am. J. Human Genet. 63(4) Suppl. 953 (Abstract).

Hallahan T, Krantz D, Khabbaza E, Orlandi F, Rossi C, Curcio P, Macri S, Larsen J, Buchanan P, Macri J (1998). First Trimester Maternal Serum Screening for Down Syndrome: Intact hCG vs free Beta hCG. Am. J. Human Genet. 63(4) Suppl. 932 (Abstract).

Geifman-Holtzman, O., Krantz, D.A., Hallahan, T.W. and Macri, J.N. (1998) Maternal Excercise and Serum Alpha-fetoprotein Levels: Potential Additional Step in Prenatal Diagnosis. Am. J. Human Genet. 63(4) Suppl. 927 (Abstract).

Dugoff, L., Shultz, L., Hallahan, T., Krantz, D. Macri J. and Hobbins J.C. (1998) Free β-hCG and PAPP-A may Increase the Positive Predictive Value of Nuchal Translucency Measurements at 10-14 Week's Gestation in Patients with Fetal Aneuploidy. Am. J. Human Genet. 63(4) Suppl. 915 (Abstract).

Krantz, D.A., Hallahan, T.W., Orlandi, F., Rossi, C., Larsen, J.W., Buchanan, P.D. and Macri, J.N. (1998) First Trimester Down Syndrome Screening. Am. J. Obstet. Gynecol. 178(1) Part 2, 48 (Abstract).

Orlandi F, Damiani G, Hallahan TW, Krantz DA, Macri JN (1997) First-trimester screening for fetal aneuploidy: biochemistry and nuchal translucency. Ultrasound Obstet Gynecol. 10, 381-386.

Brambati, B., Macri, J.N., Tului, L., Hallahan, T.W., Krantz, D.A., and Alberti, E. (1997) First-Trimester Fetal Aneuploidy Screening: Maternal Serum PAPP-A and free β-hCG. in Grudzinskas, J. and Ward, T. (Eds.) Screening For Down Syndrome in the First Trimester, pp. 135-147. London: RCOG Press.

Hallahan, T.W., Krantz, D.A., Buchanan, P.D., Larsen, J.W., and Macri, J.N. (1997) Is Unconjugated Estriol Low in Trisomy 18? Am. J. Human Genet. 61(4) Suppl. 877 (Abstract).

Hallahan, T.W., Krantz, D.A., Brambati, B., Tului, L., Buchanan, P.D., Orlandi, F., Klein, V., Larsen, J.W., and Macri, J.N. (1997) Maternal Urine Screening using Dried Specimen Technology: Comparison of Free-Beta hCG and Beta Core Fragment. Am. J. Obstet. Gynecol. 176(1) Part 2, 300 (Abstract).

Krantz, D.A., Hallahan, T.W., Buchanan, P.D., Larsen, J.W., and Macri, J.N. (1997) Second-Trimester Detection of Trisomy 18 Using Free-Beta hCG and AFP. Am. J. Obstet. Gynecol. 176(1) Part 2, 293 (Abstract).

Orlandi, F., Krantz, D.A., Hallahan, T.W., Larsen, J.W,,, and Macri, J.N. (1997) Prospective First-Trimester Screening: Analysis of Nuchal Translucency and Correlation with Biochemical Markers. Am. J. Obstet Gynecol. 176(1) Part 2, 211 (Abstract).

Hallahan, T.W., Dewey, P., Carlin, M., Macri, J.N., Krantz, D.A., and Larsen, J.W. (1996) Prenatal Maternal Serum HIV-1 Antibody Screening. Amer. College Obstet. Gynecol. Annual Meeting Presentation.

McPherson, J.T., Rumbough, R., Hallahan, T.W., Dewey, P., Carlin, M., Macri, J.N., Krantz, D.A., and Larsen, J.W. (1997) Prenatal Maternal Serum HIV-1 Antibody Screening: Comparison of OTC Vironostika HIV-1 EIA with Abbott HIV AB HIV-1 EIA. CDC/ASTPHLD Annual Conference on Human Retrovirus Testing.

Spencer K, Aitken DA, Macri JN, Buchanan PD (1996) Urine Free Beta hCG and Beta Core in Pregnancies Affected by Down Syndrome. Prenat Diagn 16: 605-13.

Tului, L., Brambati, B., Krantz, D.A., Hallahan, T.W., and Macri, J.N. (1996) Effect of Maternal Weight and Smoking on First-Trimester Down Syndrome Screening with Maternal Serum free-Beta/PAPP-A. Am. J. Human Genet. 59(4) Suppl. 1931 (Abstract).

Orlandi, F., Jakil, M., Krantz, D.A., Hallahan, T.W., and Macri, J.N. (1996) First-Trimester Prenatal Screening Utilizing Dried Blood Technology: Effect of Maternal Weight on Free-Beta/PAPP-A. Am. J. Human Genet. 59(4) Suppl. 1904 (Abstract).

Larsen. J.W., Krantz, D.A., Hallahan, T.W., Buchanan, P.D. and Macri, J.N. (1996) Prenatal Screening of Consecutive Pregnancies in the Same Patient. Am. J. Human Genet. 59(4) Suppl. 1890 (Abstract).

Krantz, D.A., Orlandi, F., Rossi, C., Brambati, B., Tului, L., , Larsen, J.W., Anderson, R., Hallahan,T.W., and Macri, J.N. (1996) Prospective First-Trimester Screening: Free-Beta / PAPP-A Analysis Utilizing Dried Blood Technology. Am. J. Human Genet. 59(4) Suppl. 1888 (Abstract).

Hallahan, T.W., Anderson, R., Brambati, B., Tului, L., Krantz, D.A., Larsen, J.W., Buchanan, P.D., Orlandi, F., and Macri, J.N. (1996) Correlation of Maternal Blood and Maternal Urinary Free-Beta hCG using Dried Specimen Technology. Am. J. Human Genet. 59(4) Suppl. 1876 (Abstract).

Buchanan, P.D., Krantz, D.A., Hallahan, T.W., Larsen, J.W., and Macri, J.N. (1996) Detection of Molar Pregnancies within a Down Syndrome Screening Protocol Using Free-Beta hCG and AFP. Am. J. Human Genet. 59(4) Suppl. 1846(Abstract).

Brambati. B., Tului, L., Orlandi, F., Damiani, G., Krantz D.A., Hallahan, T.W., and Macri, J.N. (1996) First-Trimester Down Syndrome Screening with Free Beta and PAPP-A: Observations in Multiple Pregnancies. Am. J. Human Genet. 59(4) Suppl. 1844(Abstract).

Macri JN, Spencer K (1996) Toward the Optimal protocol for Down Syndrome Screening. Am J Obstet Gynecol 174: 1668-69.

Aitken DA, Wallace EM, Crossley JA, Swanston IA, Van-Pareren Y, Van-Maarle-M, Groome NP, Macri JN, Connor JM (1996) Dimeric Inhibin A as a Marker for Down’s syndrome in Early Pregnancy. N Engl J Med 334(19):1231-36.

Krantz DA, Larsen JW, Buchanan PD, Macri JN (1996) First Trimester Down Syndrome Screening: Free Beta-human Chorionic Gonadotropin and Pregnancy-Associated Plasma Protein A. Am J Obstet Gynecol 174:612-616.

Macri JN, Anderson RW, Krantz DA, Larsen JW, Buchanan PD (1996) Prenatal Maternal Dried Blood Screening with Alpha-fetoprotein and Free Beta human Chorionic Gonadotropin for Open Neural Tube Defect and Down Syndrome. Am J Obstet Gynecol 174: 566-72.

Krantz, D., Brambatti, B., Tului, L., Hallahan, T., Buchanan, P., Larsen, J., and Macri, J. (1996) First Trimester Serologic Screening: Additional Detection of Trisomies 18 and 13. Am. J. Ob. Gyn. 174(1) Part 2, 450.

Hallahan, T., Larsen, J., Buchanan, P., Krantz, D., and Macri, J. (1996) Dimeric Inhibin-A in Second Trimester Down Syndrome Screening. Am. J. Ob. Gyn. 174(1) Part 2, 451.

Krantz, D.A., Spencer, K., Buchanan, P.D., Hallahan, T.W., Klein, V.R., and Macri, J.N. (1995) Identifying Triplet Pregnancies at Increased Risk with an Atypicality Index Employing MSAFP and Free Beta (hCG). Am. J. Human Genet. 57(4) Suppl. 2005.

Macri, J.N., Berry, E., Aitken, D., Spencer, K., Larsen, J.W., Buchanan, P.D., Li, L., Krantz, D.A., and Hallahan, T.W. (1995) First Trimester Free Beta (hCG) in Maternal Serum and Maternal Dried Whole Blood Paper Spots. Am. J. Human Genet. 57(4) Suppl. 1649.

Hallahan, T. W., Larsen, J.W., Buchanan, P.D., Krantz, D.A., and Macri, J.N. (1995) Amniotic Fluid AFP and AChE Results in Early and Late Gestation. Am. J. Human Genet. 57(4) Suppl. 1627.

Barnabei VM, Krantz DA, Macri JN, Larsen JW (1995) Enhanced Twin Pregnancy Detection within an Open Neural Tube Defect and Down Syndrome Screening Protocol Using Free Beta hCG and AFP. Prenat Diagn 15:1131-1134.

Macri JN (1994) The measurement of free Beta-hCG in Screening for Down’s syndrome. Screening for Down’s syndrome. Editors: Grudzinskas JG, Chard T, Chapman M, Cuckle H.

Macri JN, Spencer K, Garver K, Buchanan PD, Say B, Carpenter NJ, et al (1994) Maternal Serum Free Beta hCG Screening: Results of Studies Including 480 Cases of Down Syndrome. Prenat Diagn 14:97-103