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Vitamin K Deficiency: Causes, Symptoms and Treatment

Vitamin K deficiency occurs when the body does not receive enough Vitamin K, leading to impaired blood clotting and bone health issues. It most commonly affects newborns, older adults, and individuals with malabsorption disorders.

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Things worth knowing about "Vitamin K Deficiency"

Vitamin K deficiency occurs when the body does not receive enough Vitamin K, leading to impaired blood clotting and bone health issues. It most commonly affects newborns, older adults, and individuals with malabsorption disorders.

What is Vitamin K Deficiency?

Vitamin K deficiency occurs when the body has insufficient levels of Vitamin K to support normal physiological functions. Vitamin K is a fat-soluble vitamin that exists in two main forms: Vitamin K1 (phylloquinone), found primarily in green leafy vegetables, and Vitamin K2 (menaquinone), produced by intestinal bacteria and found in fermented foods and animal products. Vitamin K is essential for blood coagulation and plays an important role in bone metabolism.

Causes

Vitamin K deficiency can arise from several different causes:

Inadequate dietary intake: A diet low in green vegetables may not provide sufficient Vitamin K.
Malabsorption disorders: Conditions such as Crohn's disease, celiac disease, or chronic pancreatitis impair the intestinal absorption of fat-soluble vitamins.
Long-term antibiotic use: Antibiotics can disrupt the gut flora, reducing the natural production of Vitamin K2 by intestinal bacteria.
Liver disease: Since Vitamin K is processed in the liver, liver conditions can lead to functional deficiency.
Vitamin K antagonists: Medications such as warfarin intentionally block the action of Vitamin K as part of anticoagulation therapy.
Newborns: Newborns have very low Vitamin K stores at birth and are routinely given Vitamin K prophylaxis to prevent bleeding complications.

Symptoms

The primary symptoms of Vitamin K deficiency relate to impaired blood clotting:

Excessive or prolonged bleeding from wounds or after surgery
Easy bruising (hematoma formation)
Nosebleeds and bleeding gums
Blood in urine or stool
In newborns: potentially life-threatening Vitamin K Deficiency Bleeding (VKDB), also known as hemorrhagic disease of the newborn
Long-term: reduced bone density and increased risk of osteoporosis

Diagnosis

Vitamin K deficiency is typically diagnosed through the following investigations:

Prothrombin time (PT) and INR: Blood tests that measure the ability of blood to clot. A prolonged PT or elevated INR may indicate Vitamin K deficiency.
PIVKA-II levels: PIVKA-II (Protein Induced by Vitamin K Absence or Antagonism) is a sensitive biomarker for Vitamin K deficiency.
Serum Vitamin K measurement: Direct measurement of Vitamin K levels in the blood, although this test is less commonly used in clinical practice.

Risk Groups

Certain groups of people are at higher risk of developing Vitamin K deficiency:

Newborns and infants (especially breastfed babies)
Older adults with restricted or poor dietary intake
Individuals with chronic gastrointestinal diseases (e.g., Crohn's disease, celiac disease)
Patients who have undergone bariatric surgery
People with chronic liver disease
Patients on long-term antibiotic therapy

Treatment

Treatment of Vitamin K deficiency depends on the underlying cause and severity:

Dietary changes: Increasing the intake of Vitamin K-rich foods such as spinach, kale, broccoli, parsley, and fermented foods (e.g., natto).
Oral supplementation: Taking Vitamin K supplements (K1 or K2), commonly in doses of 1 to 10 mg daily, depending on the indication.
Intravenous or intramuscular administration: In cases of acute bleeding or severe malabsorption, Vitamin K may be given parenterally.
Newborn prophylaxis: Standard administration of Vitamin K (typically 2 mg oral or 1 mg intramuscular) shortly after birth to prevent VKDB.
Treating the underlying condition: In cases of malabsorption or liver disease, addressing the root cause is essential for long-term management.

Recommended Intake

According to the World Health Organization (WHO) and major nutritional authorities, the recommended daily intake of Vitamin K for adults is approximately 1 microgram per kilogram of body weight per day. For an average adult, this corresponds to roughly 70 to 120 micrograms per day. Toxicity from naturally occurring Vitamin K is extremely rare; however, the synthetic form menadione (Vitamin K3) has been associated with adverse effects at high doses.

References

World Health Organization (WHO): Vitamin and Mineral Requirements in Human Nutrition, 2nd edition. Geneva: WHO Press, 2004.
Shearer MJ, Fu X, Booth SL. Vitamin K nutrition, metabolism, and requirements: current concepts and future research. Advances in Nutrition. 2012;3(2):182-195.
Lippi G, Franchini M. Vitamin K in neonates: facts and myths. Blood Transfusion. 2011;9(1):4-9.

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