Diagnostic challenge of the newborn patients with heritable protein C deficiency

Masako Ichiyama, Hirosuke Inoue, Masayuki Ochiai, Masataka Ishimura, Akira Shiraishi, Junko Fujiyoshi, Hironori Yamashita, Kazuo Sato, Shinya Matsumoto, Taeko Hotta, Takeshi Uchiumi, Dongchon Kang, Shouichi Ohga

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Objective: The diagnosis of neonatal-onset protein C (PC) deficiency is challenging. This study aimed to establish the neonatal screening of heritable PC deficiency in Japan. Study design: We determined the changes in plasma activity levels of PC and protein S (PS) in healthy neonates, and studied newborn patients with PROC mutation in the Japanese registry. Result: Physiological PC and PS levels increased with wide range. The PC/PS-activity ratios converged after birth. The PC/PS-activity ratios of 19 patients with biallelic mutations, but not, 9 with monoallelic mutation, were lower than those of 13 without mutation. The logistic regression analyses established a formula including two significant variables of PC activity (cut-off < 10%, odds ratio = 30.0) and PC/PS-activity ratio (cut-off < 0.35, odds ratio = 22.7), with 93% sensitivity and 44% specificity for determining patients with mutation(s). Conclusion: The PC/PS-activity ratio is an effective parameter for the genetic screening of neonatal-onset PC-deficiency in Japanese population.

Original languageEnglish
Pages (from-to)212-219
Number of pages8
JournalJournal of Perinatology
Issue number2
Publication statusPublished - Feb 1 2019

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Obstetrics and Gynaecology


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