Vitamin K (Nutritional) Blood Test, from our experts to you.
Dr Sam Rodgers MBBS, MRCGP

Chief Medical Officer meet our doctors

Expert Image

What is
vitamin K?

Vitamin K refers to a group of fat-soluble vitamins that play a role in blood clotting, regulating blood calcium levels, and bone metabolism. In the liver, vitamin K helps supports prothrombin and factors VII, IX, and X, which are necessary for blood to clot properly.


How do you
get vitamin K?

Most people get all the vitamin K they need through a varied and balanced diet. Because vitamin K is a fat-soluble vitamin, any vitamin K in the body that is not needed immediately is stored in the liver for future use. Green leafy vegetables, including broccoli and spinach, vegetable oils, and fortified cereals, are all good sources of vitamin K.


How common is
vitamin K deficiency?

In the UK, for people who eat a healthy, balanced diet, vitamin K deficiency is rare. However, people with conditions that limit the absorption of dietary vitamins, such as biliary obstruction, coeliac disease, ulcerative colitis, and cystic fibrosis, can be at risk of vitamin K deficiency. Vitamin K supplements are available but monitoring the dose is important as too much can be harmful, so please speak with your doctor before supplementing vitamin K.


What's included?

Vitamins
Select profile for more information

Vitamin K1 and K2

How to prepare
for your test

Special instructions

Prepare for your Vitamin K (Nutritional) Blood Test by following these instructions. Do not eat for 12 hours prior to your test. Drink plenty of water, if you take medication then you are allowed to take it as you would normally. Wrap your sample in foil immediately after it is taken.


Our latest customer reviews