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OBJECTIVES: To assess the relationship, if any, between complement, fetal antigen, and shaking rigors during labor and delivery. METHODS: We recruited 13 volunteers for serial blood sampling during labor and childbirth. RESULTS: Complement levels had a small but significant drop (11-15%) immediately following childbirth but had no association with fetal antigen levels or shaking rigors. Fetal antigen levels failed to show any consistent relationship with shaking rigors or the labor and delivery process. CONCLUSION: Shaking rigors do not appear to be associated with changes in either complement or fetal antigen levels. Complement levels remain stable during labor but drop immediately following birth.
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Benson et al. (2006) studied this question.
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