Vitamin K Test Vitamin K is a fat-soluble vitamin that plays a crucial role in blood clotting and bone health. The Vitamin K test measures the levels of vitamin K in the blood. Pre-test preparation: No specific preparation is required for the Vitamin K test. Testing method: The Vitamin K test is usually performed on a blood sample obtained by a venipuncture. The sample is then sent to a laboratory for analysis. Common symptoms for prescribing this test: The Vitamin K test is typically ordered when a person has symptoms of vitamin K deficiency, such as easy bruising, excessive bleeding, or slow blood clotting. It may also be ordered as part of a routine evaluation of overall health or as part of a larger nutritional assessment. Diagnosis: Vitamin K deficiency is diagnosed when the level of vitamin K in the blood is below a certain threshold. Reference range: The reference range for Vitamin K varies depending on the laboratory and the method used to measure it, but it typically ranges from 0.1-2 ng/mL. Normal values: A normal Vitamin K test result is usually between 0.1-2 ng/mL. Medical disclaimer: The information provided is for educational purposes only and is not intended to replace the advice of a healthcare professional. It is important to consult with a qualified healthcare provider for proper diagnosis and treatment.