Acarboxy prothrombin in cord plasma from normal neonates

Area of Science:

• Biochemistry
• Neonatal Medicine
• Hematology

Background:

• Acarboxy prothrombin (AbP) is an undercarboxylated form of prothrombin.
• Vitamin K deficiency can lead to increased AbP levels.
• The presence and significance of AbP in neonatal plasma require further investigation.

Purpose of the Study:

• To determine the incidence and levels of AbP in umbilical cord plasma.
• To investigate factors associated with AbP presence in neonates.
• To explore the relationship between AbP and coagulation parameters in newborns.

Main Methods:

• Detection of AbP in plasma samples from umbilical cords, coumadin-treated patients, and normal adults.
• Analysis of AbP levels across different racial groups and correlation with clinical factors.
• Measurement of the prothrombin index.

Main Results:

• AbP was detected in 48/128 (37.5%) of umbilical cord plasma samples and in all 65 coumadin patients; none found in 20 normal adults.
• AbP levels were significantly higher in Black neonates compared to White and mixed-origin neonates.
• A negative correlation was observed between AbP levels and the prothrombin index.

Conclusions:

• AbP is present in neonatal circulation, with higher levels observed in Black infants.
• The negative correlation with the prothrombin index suggests impaired vitamin K-dependent coagulation in some neonates.
• Further research is warranted to understand the clinical implications of neonatal AbP detection.