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Intrauterine fetal transfusion of red cells

Author
Kenneth J Moise Jr, MD
Section Editors
Charles J Lockwood, MD, MHCM
Steven Kleinman, MD
Deputy Editor
Vanessa A Barss, MD, FACOG

INTRODUCTION

The infusion of red blood cells into the fetus is one of the most successful in utero therapeutic procedures. Although never studied in randomized trials, observational studies have clearly demonstrated that intrauterine transfusion (IUT) of the severely anemic fetus improves survival. Universal use of prophylactic Rh(D) immune globulin has reduced the need for IUT dramatically; however, the procedure continues to be an essential modality for treatment of severe fetal anemia from a variety of causes, such as non-Rh(D) alloimmunization, parvovirus B19 infection, chronic fetomaternal hemorrhage, and homozygous alpha-thalassemia.

PATIENT SELECTION

We consider pregnancies with severe fetal anemia at 18 to 35 weeks of gestation optimal candidates for IUT. We obtain fetal blood via percutaneous umbilical blood sampling for hematocrit/hemoglobin determination when the fetal middle cerebral artery peak systolic velocity is greater than 1.50 multiples of the median and perform the first IUT if fetal hemoglobin is two standard deviations below the mean value for gestational age (table 1). Intervention at this moderately reduced hemoglobin level results in a better fetal outcome than waiting until development of severe anemia (hemoglobin level more than 7 g/dL below the normal mean for gestational age [1]) or hydrops (actual hemoglobin level <5 g/dL) [2]. A hematocrit less than 30 percent can also be used as the threshold for fetal transfusion [3].

The procedure is generally limited to pregnancies between 18 and 35 weeks of gestation because before 18 weeks the small size of the relevant anatomic structures causes technical challenges and after 35 weeks IUT is considered riskier than delivery followed by postnatal transfusion therapy [4].

For the rare patient with very early (≤18 weeks) severe alloimmunization, plasma exchange and administration of intravenous immunoglobulin G may maintain the fetal hematocrit above life-threatening levels long enough to achieve a gestational age when IUT is technically feasible. A variety of therapeutic regimens have been described in case reports and small cases series [5].

BLOOD PREPARATION

Anonymous donor units — Red blood cells (RBCs) used for IUT should undergo the same testing that occurs for any red cell donor unit. The units are cross-matched with maternal blood to reduce the risk of sensitization to new red cell antigens. (See "Blood donor screening: Laboratory testing".)

                              

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Literature review current through: Jun 2015. | This topic last updated: Jul 27, 2015.
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