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Would a full blood count show anything serious?

Full blood count (FBC) This can help give an indication of your general health, as well as provide important clues about certain health problems you may have. For example, an FBC may detect signs of: iron deficiency anaemia or vitamin B12 deficiency anaemia. infection or inflammation.

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Blood tests can be used in a number of ways, such as helping to diagnose a condition, assessing the health of certain organs or screening for some genetic conditions. This page describes some common blood tests. For more information about a wider range of tests, search the blood test A-Z index on Lab Tests Online UK. Blood cholesterol test Cholesterol is a fatty substance mostly created by the liver from the fatty foods in your diet and is vital for the normal functioning of the body. Having a high level of cholesterol can contribute to an increased risk of serious problems such as heart attacks and strokes. Blood cholesterol levels can be measured with a simple blood test. You may be asked not to eat for 12 hours before the test (which usually includes when you're asleep) to ensure that all food is completely digested and won't affect the result, although this isn't always necessary. Find out more about getting tested for high cholesterol and read about cholesterol tests on Lab Tests Online UK. Blood culture This involves taking a small sample of blood from a vein in your arm and from 1 or more other parts of your body. The samples are combined with nutrients designed to encourage the growth of bacteria. This can help show whether any bacteria are present in your blood. At least 2 samples are usually needed. Read more about blood cultures on Lab Tests Online UK Blood gases test A blood gases sample is taken from an artery, usually at the wrist. It's likely to be painful and is only carried out in hospital. A blood gas test is used to check the balance of oxygen and carbon dioxide in your blood, and the balance of acid and alkali in your blood (the pH balance). A pH imbalance can be caused by: problems with your respiratory system, such as pneumonia or chronic obstructive pulmonary disease (COPD) Blood glucose (blood sugar) tests A number of tests can be used to diagnose and monitor diabetes by checking the level of sugar (glucose) in the blood. These include the: fasting glucose test – where the level of glucose in your blood is checked after fasting (not eating or drinking anything other than water) for at least 8 hours glucose tolerance test – where the level of glucose in your blood is checked after fasting, and again 2 hours later after being given a glucose drink HbA1C test – a test done at your GP surgery or hospital to check your average blood sugar level over the past 3 months Blood glucose test kits may be available to use at home. These only require a small "pin prick" of blood for testing. Read more about glucose tests on Lab Tests Online UK

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Blood typing This is done before donating blood or having a blood transfusion, to check what your blood group is. If you are given blood that doesn't match your blood group, your immune system may attack the red blood cells, which can lead to potentially life-threatening complications. Blood typing is also used during pregnancy, as there's a small risk the unborn child may have a different blood group from their mother, which could lead to the mother's immune system attacking her baby's red blood cells. This is known as rhesus disease. If you don't already know your blood type, your blood will be tested at least once during your pregnancy to determine if there's a risk of rhesus disease. Read more about diagnosing rhesus disease. If testing reveals there is a risk of rhesus disease, an injection of a medicine that stops the mother's immune system attacking her baby's blood cells can be given. Read more about preventing rhesus disease. Read more about blood typing on Lab Tests Online UK Chromosome testing (karyotyping) This is a test to examine bundles of genetic material called chromosomes. By counting the chromosomes (each cell should have 23 pairs) and checking their shape, it may be possible to detect genetic abnormalities. Chromosome testing can be used: to help diagnose differences in sex development (DSD), such as androgen insensitivity syndrome for couples who have experienced repeated miscarriages, to see if a chromosomal problem could be responsible C-reactive protein (CRP) test This is another test used to help diagnose conditions that cause inflammation. CRP is produced by the liver and if there is a higher concentration of CRP than usual, it's a sign of inflammation in your body. Read more about C-reactive protein on Lab Tests Online UK Electrolyte test Electrolytes are minerals found in the body, including sodium, potassium and chloride, which perform jobs such as maintaining a healthy water balance in your body. Changes in the level of electrolytes can have various possible causes, including dehydration, diabetes or certain medicines. Read more about electrolytes on Lab Tests Online UK Full blood count (FBC) This is a test to check the types and numbers of cells in your blood, including red blood cells, white blood cells and platelets. This can help give an indication of your general health, as well as provide important clues about certain health problems you may have. For example, an FBC may detect signs of: iron deficiency anaemia or vitamin B12 deficiency anaemia

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infection or inflammation

Genetic testing and screening This involves extracting a sample of DNA from your blood, then searching the sample for a specific genetic change (mutation). Genetic conditions that can be diagnosed this way include: haemophilia – a condition that affects the blood's ability to clot cystic fibrosis – a condition that causes a build-up of sticky mucus in the lungs spinal muscular atrophy – a condition involving muscle weakness and progressive loss of movement sickle cell disease – a condition that causes a shortage of normal red blood cells autosomal dominant polycystic kidney disease – a condition that causes fluid-filled sacs called cysts to develop in the kidneys Genetic screening can also be used to check if someone carries a particular gene that increases their risk of developing a genetic condition. For example, if your brother or sister developed a genetic condition in later life, such as Huntington's disease, you may want to find out whether there is a risk that you could also develop the condition. Read more about genetic and genomic testing Liver function test When the liver is damaged, it releases substances called enzymes into the blood and levels of proteins produced by the liver begin to drop. By measuring the levels of these enzymes and proteins, it's possible to build up a picture of how well the liver is functioning. This can help to diagnose certain liver conditions, including hepatitis, cirrhosis (liver scarring), and alcohol-related liver disease. Read more about liver function tests on Lab Tests Online UK Thyroid function test This test is used to test your blood for levels of thyroid-stimulating hormone (TSH), and, where needed, thyroxine and triiodothyronine (thyroid hormones). If you have low or high levels of these hormones, it could mean you have a thyroid condition such as an underactive thyroid or overactive thyroid. Read more about thyroid function tests on Lab Tests Online UK

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