What does your blood say about you?

General Health

Do you know what's in your blood?


Emily Condon
BSc (Hons) Biological Sciences

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Here at Medichecks, we have processed over 3 million results, many of which have been obtained from a blood sample. On average, an adult has around 5 litres of blood circulating around their body. We all know that the heart pumps blood around our body and that it’s crucial for keeping us alive but many people are unaware of all the components within our blood. Do you know what’s in your blood? 

What is blood?

Blood is essential to life and has many important roles in the body including transporting and supplying oxygen and nutrients to our cells, removing waste materials such as carbon dioxide, protecting us from infection and transmitting signals from one area of the body to another.   

What is blood made of?

Blood has 4 main components - plasma, red blood cells, white blood cells and platelets, each with their own roles. 

  • Plasma makes up around 55% of blood and is the liquid component of blood containing over 700 proteins and other substances including hormones, fats, carbon dioxide, vitamins and glucose.
  • Red blood cells (also called erythrocytes and RBCs) contain haemoglobin - a protein that distributes oxygen to the cells of the body. Red blood cells also carry waste carbon dioxide back to the lungs.
  • White blood cells (also known as leukocytes and WBCsare essential for good health and protection against illness and disease. When the body is in distress and a particular area is under attack, white blood cells rush to help destroy the threat. There are a variety of different white blood cell types each with different roles in the immune response.
  • Platelets are crucial in helping the blood to clot when the body is injured. If a blood vessel is damaged, it sends out signals to platelets, they pick up this signal, rush to the site of damage and form a blood clot. 

What is a blood group?

Although our blood may look identical, the exact composition of blood is not the same in everyone. The surface of each red blood cell is coated with a combination of sugars and proteins called antigens. The absence or presence of particular antigens (which is determined by the genes you inherit from your parents), determines your blood type. There are 4 main blood groups, referred to as the ABO system: O, A, B and AB. Blood groups are very important when it comes to blood transfusions as receiving blood from the wrong ABO group can be life-threatening.

The rhesus (Rh) system is also important in blood transfusions. There are 5 main rhesus antigens on red cells with Rh D being the most important. The D antigen on red blood cells is what gives you gives individuals the positive (+) or the negative (-) after the letter A, B, AB or O of their blood group.

Find out your blood group

What does your blood say about you?

Blood is an invaluable window through which we can look into a person’s inner health - and just a few drops of blood is enough to get a huge amount of information about someone. It can tell us everything from hormone and nutrient levels, how much sugar we have in our blood, to our cholesterol status and organ function. You don’t have to be ill to benefit from a blood test - nothing puts a spring in your step more than a clean bill of health, and if something is amiss? Rest assured that many of the conditions we test for can be reversed through healthy lifestyle changes if caught early enough. 

Our Essential Blood test is a great entry level blood test providing valuable insights into your current state of health. While our best selling comprehensive Well Man UltraVit and Well Woman UltraVit panels are the perfect way to get a full picture of your inner health.

Order your test today to find out what your blood says about you! 


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