Vitamin K (Nutritional)
Private Vitamin K (Nutritional) testing in London for £153.99, measuring one fat-soluble vitamin marker with results expected in around 2 weeks.
Turnaround time
2 weeks
Biomarkers count
1
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Overview of the Vitamin K (Nutritional) Test
The Vitamin K (Nutritional) blood test measures Vitamin K status, providing specialist information about a fat-soluble vitamin required for normal blood clotting and several proteins involved in bone metabolism.
The test assesses 1 nutritional biomarker: Vitamin K (Nutritional).
Vitamin K is required for the activation of several coagulation proteins, including Factors II, VII, IX and X.
It also contributes to activation of anticoagulant proteins C and S.
Without sufficient Vitamin K, normal clot formation can become impaired.
Vitamin K also activates proteins involved in calcium regulation and bone metabolism.
Dietary Vitamin K1 is found particularly in green leafy vegetables.
Vitamin K2 refers to several menaquinones found in fermented foods and produced to varying degrees by intestinal bacteria.
Clinically significant deficiency is uncommon in healthy adults eating a varied diet.
Risk increases with fat malabsorption, cholestatic liver or biliary disease, prolonged antibiotic exposure and severe nutritional restriction.
Vitamin K status is also clinically relevant to Warfarin treatment because Warfarin works by antagonising Vitamin K-dependent clotting-factor production.
The test is not a replacement for coagulation testing.
Prothrombin Time and INR provide functional information about blood clotting and can become abnormal in clinically significant Vitamin K deficiency.
The specimen also requires careful processing because Vitamin K is sensitive to light and laboratory guidance requires appropriate protection and freezing.
What Does the Vitamin K (Nutritional) Test Check?
The test measures nutritional Vitamin K status. This test measures 1 biomarker.
Vitamin K (Nutritional)
Measures Vitamin K status relevant to activation of clotting proteins and selected bone-related proteins.
Who May Benefit From the Vitamin K (Nutritional) Test?
Vitamin K testing can be useful where deficiency, malabsorption or unusual supplementation is being investigated.
People with unexplained easy bruising or bleeding under clinical assessment - Vitamin K deficiency can impair activation of clotting proteins.
People with fat-malabsorption disorders - Vitamin K requires normal fat absorption.
People with cholestatic liver or biliary disease - Reduced bile delivery can impair absorption of fat-soluble vitamins.
People taking prolonged courses of antibiotics - Antibiotic exposure can alter intestinal bacteria and may contribute to deficiency in susceptible people.
People receiving long-term nutritional support - Trace vitamin status can require monitoring.
People with a previous low Vitamin K result - Repeat testing can assess correction.
People taking Vitamin K supplements - Laboratory testing can help assess unusually high intake where clinically relevant.
People specifically referred for nutritional coagulation assessment - Vitamin K can complement PT and INR.
How to Prepare
Do not stop Warfarin or deliberately change Vitamin K intake before testing unless instructed by the anticoagulation team.
The specimen requires specialist handling and should be processed according to laboratory instructions.
Symptoms and Reasons to Consider the Vitamin K (Nutritional) Test
Vitamin K deficiency primarily affects normal blood clotting, although mild deficiency may cause no obvious symptoms.
Easy bruising - Reduced clotting-factor activation can increase bruising.
Prolonged bleeding from small cuts - Significant deficiency can impair haemostasis.
Frequent nosebleeds - Bleeding symptoms can have many causes, including coagulation abnormalities.
Unexplained prolonged Prothrombin Time - Vitamin K deficiency is one possible cause.
Fat malabsorption - Reduced absorption of fat-soluble vitamins can lower Vitamin K.
Known cholestatic disease - Reduced bile availability can impair intestinal Vitamin K absorption.
Long-term restrictive diet - Extremely limited intake can contribute to low status.
Significant unexplained bleeding requires clinical assessment rather than relying on nutritional testing alone.
People taking Warfarin should not change Vitamin K intake or supplementation without guidance from the clinician managing anticoagulation.
How to Book Your Vitamin K (Nutritional) Test
The Vitamin K test can be booked privately for specialist nutritional assessment.
Choose the Vitamin K (Nutritional)
Select the individual Vitamin K blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where specialist sample handling can be met.
Attend your appointment
A trained healthcare professional collects the required blood specimen and protects it appropriately from light.
Laboratory analysis
Your sample undergoes specialist measurement of Vitamin K (Nutritional).
Receive your results securely
Your authorised result is delivered securely and can be considered alongside PT, INR and wider nutritional investigations where appropriate.
When Will I Receive My Results?
The current live London Blood Tests page lists a turnaround of approximately 2 weeks after laboratory receipt for Vitamin K (Nutritional).
Vitamin K requires specialist laboratory processing.
The specimen must be protected from light and processed correctly after collection.
Turnaround begins when an acceptable specimen reaches the laboratory.
Understanding Your Results
A low Vitamin K result can indicate reduced nutritional availability or impaired absorption.
Possible causes include fat malabsorption, biliary disease, severe dietary deficiency or selected medication effects.
Where deficiency is clinically significant, Prothrombin Time or INR can also become abnormal.
A result within range suggests adequate measured Vitamin K status according to the laboratory method.
A high result is often associated with supplementation.
The clinical meaning depends on why testing was requested.
People taking Warfarin require particularly careful interpretation because anticoagulation is intentionally influenced by Vitamin K metabolism.
The laboratory result should not be used to self-adjust anticoagulant medication.
Why Book With London Blood Tests?
London Blood Tests provides private specialist Vitamin K nutritional testing.
Measures nutritional Vitamin K status - The test assesses a vitamin essential to normal clotting-factor activation.
Relevant to fat malabsorption - Vitamin K absorption depends on normal gastrointestinal fat handling.
Can complement coagulation testing - PT and INR provide functional clotting information.
Useful during nutritional monitoring - Testing can support assessment where deficiency risk is increased.
Specialist specimen handling - The sample is protected from light and processed according to laboratory requirements.
Suitable for broader vitamin assessment - Other fat-soluble vitamins can be measured where clinically relevant.
Professional blood collection - Clinic and suitable mobile appointments are available where handling requirements permit.
Clear pricing - The Vitamin K (Nutritional) test costs £153.99.
Private Vitamin K (Nutritional) Blood Test in London
London Blood Tests provides private Vitamin K nutritional testing for people requiring specialist assessment of Vitamin K status.
The test costs £153.99 and measures 1 nutritional biomarker.
The current live page lists results in approximately 2 weeks after laboratory receipt.
The result should be interpreted alongside medication, malabsorption history and coagulation testing where relevant.