• A nutritional condition produced by a deficiency of VITAMIN K in the diet, characterized by an increased tendency to hemorrhage (HEMORRHAGIC DISORDERS). Such bleeding episodes may be particularly severe in newborn infants. (From Cecil Textbook of Medicine, 19th ed, p1182)
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• Condition due to a deficiency of vitamin K.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Deficiency of vitamin K. It may lead to bleeding, manifested with ecchymoses, petechiae, and hematomas. In infants it may cause hemorrhagic disease of newborn with intracranial and retroperitoneal bleeding.
  NCI
  U.S. National Cancer Institute, 2021
• Depletion of fat-soluble vitamin K stores.
  NICHD Pediatric Terminology
  U.S. National Cancer Institute, 2021
• Vitamin K deficiency results from extremely inadequate intake, fat malabsorption, or use of coumarin anticoagulants. Deficiency is particularly common among breastfed infants. It impairs clotting. Diagnosis is suspected based on routine coagulation study findings and confirmed by response to vitamin K. Treatment consists of vitamin K...
  Merck Manuals
  Merck & Co., Inc., 2025
• Vitamin K (VK) deficiency can occur in any age group but is encountered most often in infancy. VK, an essential, lipid-soluble vitamin that plays a vital role in the production of coagulation proteins, is found in green, leafy vegetables and in oils, such as soybean, cottonseed, canola, and olive oils.
  Medscape
  WebMD, 2025