Vitamin K Deficiency: Diagnosis and Management.

Area of Science:

• Biochemistry
• Hematology
• Nutrition

Background:

• Vitamin K (VK) is vital for blood coagulation, acting as a cofactor for gamma-carboxylation of clotting factors.
• VK deficiency (VKD) can lead to coagulopathy and increased bleeding risk, particularly in neonates.
• Dietary vitamin K1 and gut flora-produced vitamin K2 contribute to daily requirements, but tissue stores are limited.

Purpose of the Study:

• To review the causes, consequences, diagnosis, prevention, and treatment of Vitamin K deficiency.
• To highlight the challenges in diagnosing VKD and interpreting coagulation assays.
• To emphasize the importance of VK prophylaxis in at-risk populations.

Main Methods:

• Literature review summarizing current information on VKD.
• Discussion of VK metabolism and its role in coagulation factor synthesis.
• Analysis of diagnostic challenges and biomarker interpretation.

Main Results:

• VKD impairs the function of coagulation factors II, VII, IX, and X, and proteins C and S.
• Neonates and infants are at the highest risk of bleeding due to VKD.
• Diagnostic discrepancies exist between different coagulation assays (e.g., PT vs. Ecarin reagents).

Conclusions:

• Vitamin K deficiency poses significant bleeding risks across all age groups.
• Early recognition and appropriate VK administration are critical for managing VKD.
• Further research into accurate and timely VKD diagnosis is warranted.