Vitamin K deficiency

Key Information

Appropriate Tests

 

INR, APTT.

NB. There is no specific assay available for vitamin K.

Cause

 

Dietary lack

 

Malabsorption

  • Cholestasis
  • Diffuse small bowel disease

 

Broad spectrum antibiotics

 

Haemorrhagic disease of the newborn

 

Reduced efficacy

INR, APTT.

Liver disease

 

Oral anticoagulants

  • Therapy
  • Illicit use
  • Rodenticide ingestion

 

See Anticoagulant monitoring
Warfarin assay if proof or documentation required.
Warfarin assay if proof or documentation required.