When you receive a blood test result, seeing numbers, abbreviations and reference ranges can be confusing. You may wonder, “Is this result normal? What does it say about my health?”
Blood tests are important tools doctors use to understand what is happening inside the body. They can help detect infections, anaemia, diabetes, problems with the kidneys or liver, and many other health conditions. However, one abnormal result does not always mean that you have a disease. Results should be interpreted alongside your symptoms, medical history and other tests.
Here are some common blood tests and what they generally mean.
1. Full Blood Count (FBC)
A Full Blood Count looks at different types of blood cells.
Haemoglobin (Hb) helps carry oxygen around your body. A low level may suggest anaemia, which can cause tiredness, weakness, dizziness or shortness of breath.
White blood cells (WBC) help your body fight infections. Higher levels can occur with infections or inflammation, while unusually low levels can have several possible causes.
Platelets help your blood clot. Very high or low platelet levels may need further investigation.
2. Blood Glucose
Blood glucose is the amount of sugar in your blood.
Tests such as fasting blood glucose and HbA1c are commonly used to check for diabetes or prediabetes.
HbA1c is particularly useful because it gives an idea of your average blood sugar level over roughly the previous two to three months.
An abnormal result does not automatically mean you have diabetes. Your healthcare professional may recommend repeat testing or additional tests before making a diagnosis.
3. Cholesterol Test
A lipid profile checks different types of fats in your blood, including LDL cholesterol, HDL cholesterol and triglycerides.
LDL is often called “bad” cholesterol because higher levels can contribute to fatty deposits in the arteries. HDL is commonly called “good” cholesterol because it helps transport cholesterol away from the bloodstream.
Your doctor considers your cholesterol results together with other factors such as age, blood pressure, diabetes, smoking and family history when assessing your cardiovascular risk.
4. Kidney Function Tests
Blood tests such as creatinine, urea and estimated glomerular filtration rate (eGFR) can provide information about how well your kidneys are working.
Creatinine is a waste product removed by the kidneys. An increased creatinine level may indicate reduced kidney function, although other factors can affect the result.
eGFR provides an estimate of how efficiently your kidneys filter blood.
5. Liver Function Tests
Liver blood tests may include ALT, AST, ALP, bilirubin, albumin and other markers.
These tests can provide clues about liver inflammation, injury or how well the liver is performing certain functions.
An abnormal liver result does not necessarily mean serious liver disease. Doctors often look at the pattern of results and may request additional tests.
6. Electrolytes
Electrolytes such as sodium and potassium are important for nerves, muscles, the heart and maintaining the body’s fluid balance.
Levels that are too high or too low can sometimes cause problems and may require medical attention, particularly when the changes are significant.
Remember: Numbers Need Context
One of the biggest mistakes people make is looking at a blood test result and diagnosing themselves.
Reference ranges can vary between laboratories, and factors such as medications, recent illness, hydration, food intake and other health conditions can influence results.
Your blood test is a clue, not the whole story.
If a result is outside the laboratory’s reference range, don’t panic. Discuss it with a qualified healthcare professional who can explain what it means in relation to your overall health.
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