check your basic health, including how well your liver and kidneys space workingcheck numbers of blood cellshelp diagnose various other medical conditions

Your blood sample is sent to the laboratory and also a specialist looks at her sample under a microscope.

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They can see the different species of cells and also can count the different blood cells. They can likewise test for different kinds the chemicals and also proteins in the blood.

Preparing for her blood tests

You have the right to eat and drink normally before most blood tests. For fasting blood tests you need to stop eating and drinking beforehand. Your doctor will tell friend for how long.

What happens?

You sit or lie under to have the test.

A doctor, nurse or phlebotomist (person specialised in acquisition blood) chooses the best vein come use. This is typically from your arm or hand. Permit them understand if you are afraid that needles, gain unwell with the sight of blood or are allergic come plasters or latex. 

They placed a tight tape (tourniquet) around your arm above the area wherein they take it the sample. You may need come clench your fist to do it less complicated to find a vein.

They clean your skin and also then placed a tiny needle into your vein. Next, they attach a little bottle or syringe come the needle to draw out some blood. They can fill several little bottles.

Once they have all the samples, they relax the band about your arm. They then take the needle out and also put press on the area with a cotton wool ball or tiny piece the gauze because that a couple of minutes. This helps to avoid bleeding and bruising.

Look away once they’re taking the blood if girlfriend prefer. Tell your doctor, nurse or phlebotomist if you feel unwell.

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Getting your results

Ask the phlebotomist, doctor or nurse when and also how friend will acquire your results. Some results might be available very quickly, such together a full blood count and also kidney and liver duty tests. Some various other tests could take several weeks.

Types that blood tests

complete blood count info

A full blood count (FBC) procedures the variety of red cells, white cells and also platelets in your blood.

Red cells bring oxygen approximately our bodies. Haemoglobin is the part of the cell the carries oxygen. If you have a low red cell count, her doctor might say she anaemic (pronounced a-nee-mic). This deserve to make you feeling tired, brief of breath and also dizzy.White cell fight infections. Over there are several different species of white cells, consisting of neutrophils and lymphocytes.Platelets help clot the blood. Symptom of a low platelet counting include abnormal bleeding, such as bleeding gums and nosebleeds.

There is a variety of common for blood counts. The range of numbers quoted as regular varies slightly between laboratories and likewise differs in between men and women. 

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Urea and also electrolytes details

These blood tests show how well your kidneys are working. Rubbish chemicals called urea and creatinine are produced by the body. Our kidneys eliminate them from our blood and also get escape of them in our urine.

Electrolytes space substances such as sodium, potassium, chloride and also bicarbonate.

Liver function tests (LFTs)

Liver duty tests (LFTs) examine how well her liver is working. LFTs look for levels the enzymes and also proteins made by the liver or which are cleared by the liver. Castle include:

alanine aminotransferase (ALT) aspartate aminotransferase (AST) alkaline phosphatase (ALP) gamma-glutamyl transferase (Gamma GT)

They could be elevated if you have actually a blockage in her liver or bile duct, or if you drink a many alcohol.

LFTs additionally look in ~ the amount of bilirubin in the blood. This is a chemistry in bile. 

Bilirubin deserve to be elevated if you have a trouble with her liver or gallbladder. Bilirubin can reason yellowing of her skin and also eyes (jaundice). 

LFTs likewise measure albumin. This is a protein in the blood that deserve to be short in some varieties of cancer. Friend can additionally have low albumin if you’ve to be eating small amounts and also are malnourished.

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Tumour markers blood test

As well together blood tests to check your basic health, her doctor may test because that cancer markers. Markers room chemical substances the can present up in the bloodstream in some species of cancer. 

For example, the markers CEA (carcinoembryonic antigen) and CA 19-9 (cancer antigen) are sometimes raised in stomach cancer, as well as other cancers. But some civilization with stomach cancer execute not have raised levels in their blood and they can be raised in non cancer conditions. 

If your tumour mite are raised at diagnosis, your doctor might check the levels again ~ treatment and also as part of your follow up.

Possible risks

Blood sampling (phlebotomy) is a for sure test. There is a possibility of:

bleeding and bruising - pressing difficult when the needle is removed have the right to help to protect against itpain - this is usually mild and can last because that a couple of minutesswelling (oedema) - ask her nurse, doctor or phlebotomist to stop an arm that is swollen or has actually a danger of swellingfeeling faint or fainting - phone call the person doing her blood test if you"re feeling lightheaded or bright at any type of timeinfection - this is really rare