Robert D. Christensen

Robert D. Christensen, MD

Languages spoken: English

Academic Information

Departments Primary - Pediatrics

Divisions: Neonatology

Board Certification

  • American Board of Pediatrics (Pediatrics)
  • American Board of Pediatrics (Sub: Neonatal-Perinatal Medicine)
  • National Board of Medical Examiners

Robert D. Christensen, MD is a Professor in the Department of Pediatrics, Division Chief of Neonatology and Division of Hematology/Oncology Dr. Christensen received his medical degree from Columbia University College of Physicians and Surgeons in New York City, he completed his Pediatric residency at Stanford University Hospital, and his Neonatology and Hematology fellowships at the University of Utah. He was Chief of the Division of Human Development and Aging at the University until 1993 when he was appointed Chief of the Division of Neonatology at the University of Florida. After 9 years he was appointed Lewis A. Barness Professor and Chairman of Pediatrics at the University of South Florida College of Medicine in Tampa, and Physician-in-Chief of All Children’s Hospital in St. Petersburg, Florida. Before being recruited back to the University of Utah School of Medicine in January 2015, Dr. Christensen served as Director of Neonatology Research for Intermountain Healthcare and Medical Director of Neonatology for the Urban North Region.

His research involves Clinical Neonatal Hematology and Transfusion Medicine. Dr. Christensen was funded by the NIH for over 20 years for his studies in fetal and neonatal hematopoiesis, and he has served as a March of Dimes Study Section Member continuously for the past 22 years. He is the author of two textbooks on neonatal hematology, has written over 150 book chapters for medical books, and has published over 350 peer-reviewed articles in medical journals.

Education History

Fellowship University of Utah
 Fellow
Fellowship University of Utah
 Fellow
Residency Stanford University Hospital
 Resident
Professional Medical Columbia University College of Physicians and Surgeons
 MD
Undergraduate University of Utah
 BS

Selected Publications

Journal Article

  1. Bishara N, Bahr TM, Woodbury A, Christensen RD, Ohls RK (2026). Assessment of iron sufficiency in premature infants treated with darbepoetin using conventional and novel erythrocyte metrics. J Perinatol.
  2. Zeiler BB, Bahr TM, Doyle K, Henry E, Carlson LC, Davenport P, Sola-Visner MC, Ohls RK, Christensen RD (2026). Redefining neonatal thrombocytopenia: an evidence-based approach, improved by the refineR algorithm. J Perinatol.
  3. Zeiler BB, Bahr TM, Lai KV, Addams JL, Stone EF, Swenson EA, Ohls RK, Christensen RD (2026). The risk of developing severe bronchopulmonary dysplasia: evaluating associations with the nucleated red blood cell count at birth and volume of transfusions received. Front Pediatr, 14, 1880763.
  4. Christensen RD, Doyle K, Henry E, Bennett ST, Zeiler BB, Ilstrup SJ, Swenson EA, Bahr TM, Ohls RK (2026). Reference intervals for circulating nucleated red blood cell counts of neonates, improved by the refineR algorithm. J Perinatol, 46(5), 780-785.
  5. Zeiler BB, Bahr TM, Ohls RK, Christensen RD (2026). Kernicterus Continues to Occur in the USA Despite Concerted Preventive Efforts. Case Rep Pediatr, 2026, 5545697.
  6. Zeiler BB, Hartnett ME, Addams JL, Stone EF, Ilstrup SJ, Bahr TM, Ohls RK, Christensen RD (2026). Transfusion Histories of Neonates Who Developed Severe Retinopathy of Prematurity. Neonatology, 1-6.
  7. Bahr TM, Ohls RK, Christensen TR, Monson MC, Page JM, Dabling HA, Elliott JC, Ilstrup SJ, Christensen RD (2025). Three studies needed to inform the design of the U-BET (umbilical cord blood for extremely low-gestational-age transfusions) clinical trial. J Perinatol, 46(1), 55-60.
  8. Tweddell SM, Morelli TM, Bahr TM, Krueger A, Christensen RD, Ohls RK (2025). Identifying barriers to complying with new restrictive NICU transfusion guidelines. J Perinatol, 45(12), 1820-1824.
  9. Zeiler B, Bahr TM, Esplin SD, Hartnett ME, Ilstrup SJ, Ohls RK, Christensen RD (2025). The nucleated red blood cell count at birth, the volume of red cell transfusions received, and the risk of developing retinopathy of prematurity. J Perinatol, 45(12), 1809-1815.
  10. Bahr TM, Doyle K, Ohls RK, Christensen RD (2025). Using the refineR algorithm to generate indirect reference intervals for newborn infants for the parameters "Micro-R" and "HYPO-He". J Perinatol, 45(11), 1624-1626.
  11. Weber Z, Yost CC, Cody M, King JM, Henderson C, Christensen RD, Carr NR (2024). Acquired ineffective erythropoiesis in pediatric ECMO patients: Higher than anticipated serum EPO levels and lower than anticipated reticulocytes counts were associated with mortality. Perfusion, 40(6), 1423-1430.
  12. Bahr TM, Christensen RD, Weaver-Lewis KA, Scott DM, Gerday E, Tuttle JJ, Ohls RK (2025). A prospective randomized pilot trial comparing weekly vs. biweekly Darbepoetin administration to preterm infants. J Perinatol, 45(7), 951-956.
  13. Bahr TM, Ohls RK, Henry E, Davenport P, Ilstrup SJ, Kelley WE, Yoder BA, Sola-Visner MC, Christensen RD (2024). The number of blood transfusions received and the incidence and severity of chronic lung disease among NICU patients born >31 weeks gestation. J Perinatol, 45(2), 218-223.
  14. Bahr TM, Moise KJ Jr, Lowry K, Monson MA, Hammad IA, Goteti S, Ilstrup SJ, Vanasco P, Ohls RK, Christensen RD (2024). Duration of hemolysis among infants with hemolytic disease of the fetus and newborn. J Perinatol, 45(2), 268-270.
  15. Christensen RD, Bahr TM, Christensen TR, Ohls RK, Krong J, Carlton LC, Henry E, Sheffield MJ, Gerday E, Ilstrup SJ, Kelley WE (2023). Banked term umbilical cord blood to meet the packed red blood cell transfusion needs of extremely-low-gestational-age neonates: a feasibility analysis. J Perinatol, 44(6), 873-879.
  16. Tuttle JJ, Bahr TM, Tweddell SM, Christensen RD, Ohls RK (2024). A survey of iron supplementation, iron status surveillance, and erythropoiesis stimulating agent use in level III NICUs in the United States. J Perinatol, 44(6), 905-907.
  17. Bahr TM, Tweddell SM, Zalla JM, Dizon-Townson D, Ohls RK, Henry E, Ilstrup SJ, Kelley WE, Ling CY, Lindgren PC, OBrien EA, Christensen RD (2023). Neonatal and Obstetrical Outcomes of Pregnancies Complicated by Alloimmunization. Pediatrics, 153(6).
  18. Bahr TM, Ohls RK, Ilstrup SJ, Christensen RD (2023). Neonatal Intensive Care Unit Patients Receiving More Than 25 Platelet Transfusions. Am J Perinatol, 41(S 01), e1769-e1774.
  19. Laohajeeraphan C, Tantanate C, Christensen RD, Ngerncham S (2023). Hyperferritinemia among very-low-birthweight infants in Thailand: a prospective cohort study. J Perinatol, 44(5), 709-716.
  20. Bahr TM, Snow GL, Christensen TR, Davenport P, Henry E, Tweddell SM, Ilstrup SJ, Yoder BA, Ohls RK, Sola-Visner MC, Christensen RD (2023). Can Red Blood Cell and Platelet Transfusions Have a Pathogenic Role in Bronchopulmonary Dysplasia? J Pediatr, 265, 113836.
  21. Christensen RD, Bahr TM, Davenport P, Sola-Visner MC, Kelley WE, Ilstrup SJ, Ohls RK (2023). Neonatal Thrombocytopenia: Factors Associated With the Platelet Count Increment Following Platelet Transfusion. J Pediatr, 263, 113666.
  22. Bahr TM, Tan S, Smith E, Beauman SS, Schibler KR, Grisby CA, Lowe JR, Bell EF, Laptook AR, Shankaran S, Carlton DP, Rau C, Baserga MC, Flibotte J, Zaterka-Baxter K, Walsh MC, Das A, Christensen RD, Ohls RK, Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network (2023). Serum ferritin values in neonates 29 weeks' gestation are highly variable and do not correlate with reticulocyte hemoglobin content. J Perinatol, 43(11), 1368-1373.
  23. Bahr TM, Christensen TR, Cheatham LS, Page JM, Christensen RD (2023). Feasibility of a non-invasive method to assess fetal hemolysis in utero during the third trimester. J Perinatol, 43(11), 1437-1439.
  24. Bahr TM, Christensen TR, Henry E, Judkins AJ, Bennett ST, Pysher TJ, Lawrence SM, Ohls RK, Christensen RD (2022). Fragmented red blood cell counts of neonates with new-onset gastrointestinal disturbances. J Perinatol, 43(9), 1173-1175.
  25. Song J, Sundar KM, Horvathova M, Gangaraju R, Indrak K, Christensen RD, Genzor S, Lundby C, Divoky V, Ganz T, Prchal JT (2023). Increased blood reactive oxygen species and hepcidin in obstructive sleep apnea precludes expected erythrocytosis. Am J Hematol, 98(8), 1265-1276.
  26. Bahr TM, Christensen TR, Tweddell SM, Henry E, Rees T, Astin ME, Kelley WE, Ilstrup SJ, Ohls RK, Christensen RD (2023). Associations between blood donor sex and age, and outcomes of transfused newborn infants. Transfusion, 63(7), 1290-1297.
  27. Tweddell SM, Bahr TM, Henry E, Page JM, Ilstrup SJ, Ohls RK, Christensen RD (2023). Placental abruption and neonatal anemia. J Perinatol, 43(6), 782-786.
  28. Bahr TM, Christensen TR, Henry E, Astin M, Ilstrup SJ, Ohls RK, Christensen RD (2023). Platelet Transfusions in a Multi-Neonatal Intensive Care Unit Health Care Organization Before and After Publication of the PlaNeT-2 Clinical Trial. J Pediatr, 257, 113388.
  29. Christensen TR, Bahr TM, Henry E, Ling CY, Hanton TH, Page JM, Ilstrup SJ, Carr NR, Ohls RK, Christensen RD (2022). Neonatal subgaleal hemorrhage: twenty years of trends in incidence, associations, and outcomes. J Perinatol, 43(5), 573-577.
  30. Bahr TM, Albertine KH, Christensen RD, Dahl MJ, Rebentisch A, Dawson E, Major E, Foreman H, Headden D, Vordos Z, Nabi A, Pettet L, Badrov P, Addison C, Christensen DR (2022). Nucleated Red Blood Cell Emergence-Time in Newborn Lambs Following a Dose of Darbepoetin Alfa. Curr Pediatr Rev, 19(4), 425-428.
  31. Bahr TM, Lawrence SM, Henry E, Ohls RK, Li S, Christensen RD (2022). Severe Anemia at Birth-Incidence and Implications. J Pediatr, 248, 39-45.e2.
  32. Lieberman L, Lopriore E, Baker JM, Bercovitz RS, Christensen RD, Crighton G, Delaney M, Goel R, Hendrickson JE, Keir A, Landry D, La Rocca U, Lemyre B, Maier RF, Muniz-Diaz E, Nahirniak S, New HV, Pavenski K, Dos Santos MCP, Ramsey G, Shehata N, International Collaboration for Transfusion Medicine Guidelines ICTMG (2022). International guidelines regarding the role of IVIG in the management of Rh- and ABO-mediated haemolytic disease of the newborn. Br J Haematol, 198(1), 183-195.
  33. Bahr TM, Ohls RK, Baserga MC, Lawrence SM, Winter SL, Christensen RD (2022). Implications of an Elevated Nucleated Red Blood Cell Count in Neonates with Moderate to Severe Hypoxic-Ischemic Encephalopathy. J Pediatr, 246, 12-18.e2.
  34. Carr NR, Henry E, Bahr TM, Ohls RK, Page JM, Ilstrup SJ, Christensen RD (2021). Fetomaternal hemorrhage: Evidence from a multihospital healthcare system that up to 40% of severe cases are missed. Transfusion, 62(1), 60-70.
  35. Khashu M, Dame C, Lavoie PM, De Plaen IG, Garg PM, Sampath V, Malhotra A, Caplan MD, Kumar P, Agrawal PB, Buonocore G, Christensen RD, Maheshwari A (2022). Current Understanding of Transfusion-associated Necrotizing Enterocolitis: Review of Clinical and Experimental Studies and a Call for More Definitive Evidence. Newborn (Clarksville), 1(1), 201-208.
  36. Christensen RD, Bahr TM, Ward DM (2022). Iron deficiency in newborn infants: global rewards for recognizing and treating this silent malady. Newborn (Clarksville), 1(1), 97-103.
  37. Bahr TM, Agarwal AM, Meznarich JA, Prince WL, Wait TWP, Prchal JT, Christensen RD (2021). Thirty-five males with severe (Class 1) G6PD deficiency (c.637G>T) in a North American family of European ancestry. Blood Cells Mol Dis, 92, 102625.
  38. Pakdeeto S, Christensen TR, Bahr TM, Gerday E, Sheffield MJ, Christensen KS, Supapannachart S, Nuntnarumit P, Sukwiset S, Ohls RK, Christensen RD (2021). Reference intervals for end-tidal carbon monoxide of preterm neonates. J Perinatol, 42, 116-120.
  39. Bahr TM, Carr NR, Christensen TR, Wilkes J, OBrien EA, German KR, Ohls RK, Ward DM, Christensen RD (2021). Early iron supplementation and iron sufficiency at one month of age in NICU patients at-risk for iron deficiency. Blood Cells Mol Dis, 90, 102575.
  40. Bahr TM, Henry E, Christensen RD, Minton SD, Bhutani VK (2021). A New Hour-Specific Serum Bilirubin Nomogram for Neonates ≥35 Weeks of Gestation. J Pediatr, 236, 28-33.e1.
  41. Bahr TM, Christensen TR, Henry E, Wilkes J, Ohls RK, Bennett ST, Ward DM, Pysher TJ, Christensen RD (2021). Neonatal Reference Intervals for the Complete Blood Count Parameters MicroR and HYPO-He: Sensitivity Beyond the Red Cell Indices for Identifying Microcytic and Hypochromic Disorders. J Pediatr, 239, 95-100.e2.
  42. Bahr TM, Shakib JH, Stipelman CH, Kawamoto K, Lauer S, Christensen RD (2021). Improvement Initiative: End-Tidal Carbon Monoxide Measurement in Newborns Receiving Phototherapy. J Pediatr, 238, 168-173.e2.
  43. Gerday E, Brereton JB, Bahr TM, Elmont JO, Fullmer S, Middleton BA, Ward DM, Ohls RK, Christensen RD (2020). Urinary ferritin; a potential noninvasive way to screen NICU patients for iron deficiency. J Perinatol, 41(6), 1419-1425.
  44. Shah P, Cannon DC, Lowe JR, Phillips J, Christensen RD, Kamath-Rayne B, Rosenberg A, Wiedmeier S, Patel S, Winter S, Baker S, Ohls RK (2021). Effect of blood transfusions on cognitive development in very low birth weight infants. J Perinatol, 41(6), 1412-1418.
  45. Bahr TM, Ward DM, Jia X, Ohls RK, German KR, Christensen RD (2021). Is the erythropoietin-erythroferrone-hepcidin axis intact in human neonates? Blood Cells Mol Dis, 88, 102536.
  46. Wiedmeier SE, Bahr TM, Ohls RK, Christensen TR, Baer VL, Ilstrup SJ, Cail K, Christensen RD (2020). Exchange transfusion for hemolytic hyperbilirubinemia: could some be averted by emergent administration of an inhibitor of bilirubin production? J Perinatol, 41(4), 860-864.
  47. Bahr TM, Agarwal AM, Christensen RD (2020). Does heterozygosity for UGT1A1 *28 convey increased risk for severe neonatal jaundice? J Perinatol, 41(4), 658-660.
  48. Bahr TM, Baer VL, Ohls RK, Christensen TR, Ward DM, Bennett ST, Christensen RD (2020). Reconciling markedly discordant values of serum ferritin versus reticulocyte hemoglobin content. J Perinatol, 41(3), 619-626.
  49. DAmato G, Faienza MF, Palladino V, Bianchi FP, Natale MP, Christensen RD, Giordano P, Del Vecchio A (2020). Red blood cell transfusions and potentially related morbidities in neonates under 32 weeks' gestation. Blood Transfus, 19(2), 113-119.
  50. Konana OS, Bahr TM, Strike HR, Coleman J, Snow GL, Christensen RD (2020). Decision Accuracy and Safety of Transcutaneous Bilirubin Screening at Intermountain Healthcare. J Pediatr, 228, 53-57.
  51. Bahr TM, Lozano-Chinga M, Agarwal AM, Meznarich JA, Gerday E, Smoot JL, Taylor A, Christensen RD (2020). Dizygotic twins with prolonged jaundice and microcytic, hypochromic, hemolytic anemia with pyropoikilocytosis. Blood Cells Mol Dis, 85, 102462.
  52. Hulse W, Bahr TM, Fredrickson L, Canfield CM, Friddle K, Pysher TJ, Ilstrup SJ, Ohls RK, Christensen RD (2020). Warming blood products for transfusion to neonates: In vitro assessments. Transfusion, 60(9), 1924-1928.
  53. Hulse W, Bahr TM, Morris DS, Richards DS, Ilstrup SJ, Christensen RD (2020). Emergency-release blood transfusions after postpartum hemorrhage at the Intermountain Healthcare hospitals. Transfusion, 60(7), 1418-1423.
  54. Bahr TM, Henry E, Hulse W, Baer VL, Prchal JT, Bhutani VK, Christensen RD (2020). Early Hyperbilirubinemia in Neonates with Down Syndrome. J Pediatr, 219, 140-145.
  55. Christensen RD (2019). Medicinal Uses of Hematopoietic Growth Factors in Neonatal Medicine. Handb Exp Pharmacol, 261, 257-283.
  56. Bahr TM, Shakib JH, Stipelman CH, Kawamoto K, Cail K, Lauer S, Christensen RD (2020). Improving the Bilirubin Management Program in the Newborn Nursery: Background, Aims, and Protocol. Neonatology, 117(3), 358-364.
  57. Bahr TM, Judkins AJ, Christensen RD, Baer VL, Henry E, Minton SD, Gerday E, Bennett ST (2019). Neonates with suspected microangiopathic disorders: performance of standard manual schistocyte enumeration vs. the automated fragmented red cell count. J Perinatol, 39(11), 1555-1561.
  58. Fustolo-Gunnink SF, Roehr CC, Lieberman L, Christensen RD, Van Der Bom JG, Dame C, Del Vecchio A, Keir AK, Curley A, Stanworth SJ, Lopriore E (2019). Platelet and red cell transfusions for neonates: lifesavers or Trojan horses? Expert Rev Hematol, 12(10), 797-800.
  59. Bahr TM, DuPont TL, Christensen TR, Rees T, OBrien EA, Ilstrup SJ, Christensen RD (2019). Evaluating emergency-release blood transfusion of newborn infants at the Intermountain Healthcare hospitals. Transfusion, 59(10), 3113-3119.
  60. MacQueen BC, Christensen RD, Baer VL, Ward DM, Snow GL (2019). Screening umbilical cord blood for congenital Iron deficiency. Blood Cells Mol Dis, 77, 95-100.
  61. Bahr TM, Christensen RD, Ward DM, Meng F, Jackson LK, Doyle K, Christensen DR, Harvey AG, Yaish HM (2019). Ferritin in serum and urine: A pilot study. Blood Cells Mol Dis, 76, 59-62.
  62. Rets A, Clayton AL, Christensen RD, Agarwal AM (2019). Molecular diagnostic update in hereditary hemolytic anemia and neonatal hyperbilirubinemia. Int J Lab Hematol, 41 Suppl 1, 95-101.
  63. Judkins AJ, MacQueen BC, Christensen RD, Henry E, Snow GL, Bennett ST (2018). Automated Quantification of Fragmented Red Blood Cells: Neonatal Reference Intervals and Clinical Disorders of Neonatal Intensive Care Unit Patients with High Values. Neonatology, 115(1), 5-12.
  64. Bahr TM, Christensen RD, Agarwal AM, George TI, Bhutani VK (2019). The Neonatal Acute Bilirubin Encephalopathy Registry (NABER): Background, Aims, and Protocol. Neonatology, 115(3), 242-246.
  65. MacQueen BC, Christensen RD, Yost CC, Gordon PV, Baer VL, Schlaberg R, Lowe J (2018). Reference intervals for stool calprotectin in preterm neonates and their utility for the diagnosis of necrotizing enterocolitis. J Perinatol, 38(10), 1379-1385.
  66. Christensen RD, Agarwal AM, George TI, Bhutani VK, Yaish HM (2018). Acute neonatal bilirubin encephalopathy in the State of Utah 2009-2018. Blood Cells Mol Dis, 72, 10-13.
  67. Bhutani VK, Maisels MJ, Schutzman DL, Castillo Cuadrado ME, Aby JL, Bogen DL, Christensen RD, Watchko JF, Wong RJ, Stevenson DK (2018). Identification of risk for neonatal haemolysis. Acta Paediatr, 107(8), 1350-1356.
  68. Meznarich JA, Draper L, Christensen RD, Yaish HM, Luem ND, Pysher TJ, Jung G, Nemeth E, Ganz T, Ward DM (2018). Fetal presentation of congenital dyserythropoietic anemia type 1 with novel compound heterozygous CDAN1 mutations. Blood Cells Mol Dis, 71, 63-66.
  69. Christensen RD, Baer VL, MacQueen BC, OBrien EA, Ilstrup SJ (2018). ABO hemolytic disease of the fetus and newborn: thirteen years of data after implementing a universal bilirubin screening and management program. J Perinatol, 38(5), 517-525.
  70. Maheshwari A, Patel RM, Christensen RD (2017). Anemia, red blood cell transfusions, and necrotizing enterocolitis. Semin Pediatr Surg, 27(1), 47-51.
  71. Carroll PD, Livingston E, Baer VL, Karkula K, Christensen RD (2018). Evaluating Otherwise-Discarded Umbilical Cord Blood as a Source for a Neonate's Complete Blood Cell Count at Various Time Points. Neonatology, 114(1), 82-86.

Review

  1. Christensen RD, Bahr TM, Zeiler BB, Minton SD, Chang CL, Davidson J, Ilstrup SJ, Carroll PD, Kaufman DA, Ohls RK (2026). A CBC drawn postnatally from umbilical cord blood can provide valuable diagnostic information for infants admitted to the NICU. [Review]. J Perinatol.
  2. Husain AN, Drury A, Swenson EA, Metcalf RA, Cail K, Kawamoto K, Chang CL, Zeiler BB, Bahr TM, Ohls RK, Christensen RD (2026). Designing and implementing a clinical decision support tool to improve compliance with NICU transfusions. [Review]. J Perinatol.
  3. Christensen RD, Davenport P, Sola-Visner MC, Archambault J, Delaney C, Bahr TM, Elliott JC, Ilstrup SJ, Ohls RK (2025). Improving Platelet Transfusion Practice. [Review]. Neoreviews, 27(1), e11-e24.
  4. Christensen RD, Bahr TM, Ilstrup SJ, Hartnett ME, Ohls RK (2025). Involving neonatal hematology and transfusion medicine in global efforts to eliminate severe retinopathy of prematurity. [Review]. J Perinatol, 45(12), 1839-1847.
  5. Christensen RD, Bahr TM, Ohls RK (2025). Understanding, detecting, and managing the "late" anemia of hemolytic disease of the fetus and newborn. [Review]. Best Pract Res Clin Obstet Gynaecol, 102, 102650.
  6. Christensen RD, Bahr TM, Ohls RK, Moise KJ Jr (2024). Neonatal/perinatal diagnosis of hemolysis using ETCOc. [Review]. Semin Fetal Neonatal Med, 30(1), 101547.
  7. Ohls RK, Bahr TM, Peterson TG, Christensen RD (2024). A practical guide to reducing/eliminating red blood cell transfusions in the neonatal intensive care unit. [Review]. Semin Fetal Neonatal Med, 30(1), 101545.
  8. Bahr TM, Christensen TR, Ilstrup SJ, Ohls RK, Christensen RD (2024). Term umbilical cord blood, fully tested and processed, as the source of red blood cell transfusions for extremely-low-gestational age neonates. [Review]. Semin Fetal Neonatal Med, 30(1), 101546.
  9. Christensen RD, Bahr TM, Davenport P, Sola-Visner MC, Ohls RK, Ilstrup SJ, Kelley WE (2024). Implementing evidence-based restrictive neonatal intensive care unit platelet transfusion guidelines. [Review]. J Perinatol, 44(10), 1394-1401.
  10. Christensen RD, Bahr TM, Ohls RK, Ilstrup SJ, Moise KJ Jr, Lopriore E, Meznarich JA (2024). Erythrokinetic mechanism(s) causing the "late anemia" of hemolytic disease of the fetus and newborn. [Review]. J Perinatol, 44(6), 916-919.
  11. Christensen RD, Bahr TM, Wong RJ, Vreman HJ, Bhutani VK, Stevenson DK (2023). A "Gold Standard" Test for Diagnosing and Quantifying Hemolysis in Neonates and Infants. [Review]. J Perinatol, 43(12), 1541-1547.
  12. Christensen RD, Bahr TM, Ilstrup SJ, Dizon-Townson DS (2023). Alloimmune hemolytic disease of the fetus and newborn: genetics, structure, and function of the commonly involved erythrocyte antigens. [Review]. J Perinatol, 43(12), 1459-1467.
  13. Christensen RD, Bahr TM, Tweddell SM, Ohls RK, Henry E (2023). Diagnosing Anemia in Neonates: An Evidence-Based Approach. [Review]. Neoreviews, 24(6), e343-e355.
  14. Christensen RD, Bahr TM, Pakdeeto S, Supapannachart S, Zhang H (2022). Perinatal Hemolytic Disorders and Identification Using End Tidal Breath Carbon Monoxide. [Review]. Curr Pediatr Rev, 19(4), 376-387.

Case Report

  1. Carr NR, Bahr TM, Ohls RK, Tweddell SM, Morris DS, Rees T, Ilstrup SJ, Kelley WE, Christensen RD (2024). Low-Titer Type O Whole Blood for Transfusing Perinatal Patients after Acute Hemorrhage: A Case Series. AJP Rep, 14(2), e129-e132.
  2. Aldag E, Fan EM, Marshall I, Christensen RD, Shayota BJ, Meznarich JA (2022). An Infant With Hereditary Fructose Intolerance and a Novel Presentation of Disseminated Intravascular Coagulopathy Following Pyloromyotomy. J Pediatr Hematol Oncol, 44(7), 409-411.
  3. Carr NR, Hulse WL, Bahr TM, Davidson JM, Ilstrup SJ, Christensen RD (2022). First report of transfusing low-titer cold-stored type O whole blood to an extremely-low-birth-weight neonate after acute blood loss. Transfusion, 62(9), 1923-1926.
  4. Bahr TM, Henry E, OBrien EA, Christensen RD (2022). Nucleated Red Blood Cell Counts of Neonates Born Emergently 1-4 h after a Maternal Cardiac Arrest. Neonatology, 119(2), 255-259.
  5. Bahr TM, Knudsen MC, Lozano-Chinga M, Agarwal AM, Meznarich JA, Ohls RK, Christensen RD (2020). Infantile Pyknocytosis: End-Tidal CO, %Micro-R Measurements, Next-Generation Sequencing, and Transfusion Avoidance with Darbepoetin. Biomed Hub, 5(3), 227-234.
  6. Bahr TM, Lozano-Chinga M, Agarwal AM, Meznarich JA, Yost CC, Li P, Reading NS, Prchal JT, Christensen RD (2020). A Novel Variant in G6PD (c.1375C>G) Identified from a Hispanic Neonate with Extreme Hyperbilirubinemia and Low G6PD Enzymatic Activity. Neonatology, 117(4), 532-535.
  7. Bahr TM, DuPont TL, Morris DS, Pierson SE, Esplin MS, Brown SM, OBrien EA, Ilstrup SJ, Christensen RD (2019). First report of using low-titer cold-stored type O whole blood in massive postpartum hemorrhage. Transfusion, 59(10), 3089-3092.
  8. Judkins AJ, MacQueen BC, Christensen RD, Comstock J, Mao R, Flores-Daboub J (2018). Non-Immune Hydrops, Hypotonia, Encephalopathy, and Liver Failure with Novel Compound Heterozygous AHCY Mutations. Neonatology, 114(4), 337-340.

Editorial

  1. Christensen RD, Bahr TM, Ohls RK (2025). Administering Supplemental Iron and Erythropoiesis-Stimulating Agents to Infants Born Preterm: What Do We Need to Build Consensus? J Pediatr, 279, 114460.
  2. Christensen RD (2022). Happy Thoughts of Antonello on a Sad Day. Curr Pediatr Rev, 19(4), 329-330.
  3. Song J, Christensen RD, Thiagarajan P, Prchal JT (2021). Does neocytolysis exist after descent from high altitude? Acta Physiol (Oxf), 233(3), e13713.

Letter

  1. Ohls RK, Bahr TM, Kaufman DA, Christensen RD (2025). A survey of level 3 NICUs in Utah to the June 2025 American Academy of Pediatrics Committee on Fetus and Newborn clinical report on postnatal cord blood sampling. [Letter to the editor]. J Perinatol, 46(5), 886-887.
  2. Bahr TM, Ohls RK, Christensen RD (2024). Treating preterm infants with erythropoietin does not increase the risk of retinopathy of prematurity. [Letter to the editor]. J Perinatol, 45(2), 292-293.
  3. Bahr TM, Henry E, OBrien EA, Christensen RD (2022). Nucleated Red Blood Cell Counts of Neonates Born Emergently 1-4 h after a Maternal Cardiac Arrest. [Letter to the editor]. Neonatology, 119(5), 663-664.
  4. Bahr TM, Henry E, Christensen RD, Minton SD, Bhutani VK (2021). Reply. [Letter to the editor]. J Pediatr, 237, 317-318.
  5. Meznarich JA, Rets A, Agarwal AM, Christensen RD, Reading NS, Kuypers FA, Prchal JT (2021). Novel, de novo, beta-globin variant with decreased oxygen affinity (HBB:c.317T>A, "Hemoglobin St. George") in a healthy child with low oxygen saturations and anemia. [Letter to the editor]. Am J Hematol, 96(12), E448-E450.
  6. Bahr TM, Benson AE, Kling PJ, Ohls RK, Ward DM, Christensen RD (2021). Maternal obesity and impaired offspring neurodevelopment: could fetal iron deficiency be a pathogenic link? [Letter to the editor]. J Perinatol, 41(5), 1199-1200.
  7. Bahr TM, Kerry BB, Baserga MC, Christensen RD (2020). Improving thermoregulation in transported preterm infants. [Letter to the editor]. J Perinatol, 41(2), 356-357.
  8. Staffa SJ, Joerger JD, Henry E, Christensen RD, Brugnara C, Zurakowski D (2020). Pediatric hematology normal ranges derived from pediatric primary care patients. [Letter to the editor]. Am J Hematol.
  9. Bahr TM, Judkins AJ, Baer VL, Henry E, Grubb PH, Hulse W, Pysher TJ, Bennett ST, Christensen RD (2019). The fragmented red cell count can support the diagnosis of a microangiopathic neonatal condition. [Letter to the editor]. J Perinatol, 40(2), 354-355.
  10. Baer VL, Hulse W, Bahr TM, Ilstrup SJ, Christensen RD (2019). Absence of severe neonatal ABO hemolytic disease at Intermountain Healthcare. Why? [Letter to the editor]. J Perinatol, 40(2), 352-353.