A doctor will inquire about a person’s medical history to check whether they have any risk factors for vitamin K insufficiency.
A coagulation test is known as the prothrombin time, or the clinician may use PT test. They collect a small amount of blood and then add chemicals to see how long it takes to clot.
The clotting time for blood is normally 11 to 13.5 seconds. It might be due to a vitamin K shortage if it takes longer.
Before conducting this blood test, people may need to avoid meals high in vitamin K.
The normal range for vitamin K is 0.2-3.2 ng/mL, although one source claims that levels below 0.5 ng/mL are related to poor blood coagulation. According to another source, the reference range is 0.10-2.2 ng/mL.