Within the range of hematocrits measured (29-63%) viscosity correlated with hematocrit (r=0.877) and hemoglobin (r=0.853) but not with erythrocyte size (r=0.179). Viscosity at higher and lower sheer rates were linearly related (n=32, r=0.971). To address this issue we: (1) established reference ranges for whole-blood viscosity among preterm neonates (viscosity reference ranges had previously been reported only in term neonates) and (2) determined the effect of umbilical cord milking at deliveries 95th % range, we sought signs of hyperviscosity (plethora, hypotonia, hypoglycemia, hyperbilirubinemia, thrombocytopenia). However, the committee report expressed the concern by some practitioners that delayed clamping or cord milking might induce hyperviscosity in preterm neonates. The American College of Obstetrics and Gynecology Committee on Obstetric Practice recently endorsed delayed cord clamping at preterm delivery. 8 Department of Pediatrics, Brown Medical School, Women and Infant's Hospital of Rhode Island, Providence, RI, USA.7 Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, USA.6 Department of Pathology, Intermountain Medical Center, Murray, UT, USA.5 Department of Research, Statistical Data Center, LDS Hospital, Salt Lake City, UT, USA.4 Department of Women and Newborns, Utah Valley Regional Medical Center, Provo, UT, USA.3 1] Department of Women and Newborns, Intermountain Healthcare, Salt Lake City, UT, USA Division of Maternal/Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah School of Medicine, Salt Lake City, UT, USA. 2 1] Department of Women and Newborns, Intermountain Healthcare, Salt Lake City, UT, USA Department of Women and Newborns, Utah Valley Regional Medical Center, Provo, UT, USA.1 1] Department of Women and Newborns, Intermountain Healthcare, Salt Lake City, UT, USA Department of Women and Newborns, Neonatal Intensive Care Units, McKay-Dee Hospital Center, Ogden, UT, USA.
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