Abstract
The objective of this study is to determine whether the fetus compensates for fetal alloimmune thrombocytopenia (FAITP) by increasing serum concentrations of thrombopoietin (TPO) and interleukin-11 (IL-11). TPO and IL-11 concentrations were measured in cord blood sera of 12 neonates with FAITP, and 35 preterm and 25 term controls. TPO concentrations in the 12 patients (median 129 pg/mL, range 73 to 325 pg/mL) were similar to those of 35 healthy preterm neonates (median 183 pg/mL, range 71 to 290 pg/mL) and the 25 term controls (median 180 pg/mL, range 93 to 302 pg/mL), although the platelet counts were significantly lower in FAITP. TPO concentrations did not correlate with the platelet counts, platelet nadir after birth, or time to recovery of normal platelet count. IL-11 reached detectable concentrations only in four patients with FAITP (median 54 pg/mL). After birth, these patients had a more rapid recovery of the platelet count. Cord blood serum concentrations of TPO are not significantly elevated in FAITP and do not predict the severity of the thrombocytopenia. Elevated IL-11 may signal a more rapid platelet recovery in FAITP.
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