If you have ever been told by a GP to get "full bloods done" or searched online for a full bloods check, you may have found the term used in a variety of different ways. Some people use it to mean a full blood count (FBC). Others use it to mean a broader panel of tests covering everything from kidney and liver function to thyroid health and cholesterol.
Understanding what a full bloods check actually involves — and what it can and cannot tell you — is an important first step before booking any blood test.
This guide explains the meaning behind the term, what different blood tests may assess, how to prepare, whether fasting is required and what to do with your results.
What Is a Full Bloods Check?
"Full bloods check" is an informal phrase, not a standardised medical test with a fixed definition. In everyday use, it typically refers to a collection of blood tests intended to give a broad overview of someone's general health.
In a clinical setting, a full blood count (FBC) is a specific, well-defined test that assesses the cellular components of blood. However, when patients or websites refer to a "full bloods check," they often mean a wider panel that may include liver function, kidney function, cholesterol, glucose and sometimes thyroid or vitamin markers depending on the panel selected.
The important distinction to understand is this: a full blood count and a full bloods check are not always the same thing. The exact tests included in any panel depend on what has been ordered or selected, and no single blood test can assess every aspect of health or rule out every condition.
What Does a Full Blood Check Show?
The tests included in a full bloods check will vary depending on the specific panel. However, most comprehensive blood test panels designed for a general health check will assess some or all of the following areas.
Blood Cells
A full blood count test measures the three main types of cells in your blood:
Haemoglobin
Haemoglobin is the protein within red blood cells that binds to oxygen. It is one of the key markers in an FBC and is used, along with other red cell indices, to help identify different types of anaemia.
Kidney Function
Kidney function tests — sometimes called renal function or U&Es (urea and electrolytes) — assess how well the kidneys are filtering waste products from the blood. Common markers include creatinine, urea and estimated glomerular filtration rate (eGFR).
Liver Markers
Liver function tests (LFTs) measure enzymes and proteins produced by the liver. Markers such as ALT, AST, ALP, GGT and bilirubin can provide information about liver health, though abnormal results always require further clinical assessment to understand their cause.
Blood Glucose
A fasting glucose test measures the amount of sugar in the blood after a period of not eating. It may be used as part of a general health check to provide information relevant to blood sugar regulation. A separate test called HbA1c can give an average blood sugar picture over roughly the previous three months.
Cholesterol and Lipids
A lipid profile assesses total cholesterol, HDL ("good") cholesterol, LDL ("bad") cholesterol and triglycerides. Cholesterol testing may require fasting depending on the specific tests ordered.
Thyroid Markers
Thyroid function tests are not always included in a standard FBC but may be part of a broader health panel. TSH (thyroid-stimulating hormone) is typically the first-line marker for assessing thyroid function. If you are specifically interested in thyroid health, you can explore dedicated thyroid testing options rather than relying on a general panel to include them.
Vitamins and Other Markers
Depending on the panel selected, some comprehensive blood test packages may include vitamin D, vitamin B12, folate, iron studies or ferritin. These are not automatically part of every full bloods check and should not be assumed to be included unless confirmed in advance.
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Full Blood Count Test: What It Assesses and How It Differs
A full blood count (FBC) is one of the most commonly requested blood tests in UK healthcare and forms a core part of many routine assessments. The NHS uses the FBC to assess:
An FBC alone does not assess kidney function, liver markers, cholesterol, glucose, thyroid function or vitamins. It is a specific test with a specific scope.
When a GP or clinic refers to a broader routine blood check up, they are usually ordering an FBC alongside other tests rather than relying on the FBC alone. This distinction is worth understanding when choosing a blood test panel, as the two terms are often confused.
You can learn more about what a dedicated full blood count test involves and when it may be appropriate.
Can a Blood Test Check Your Whole Body?
The phrase "full body blood test" is widely used online and reflects a reasonable desire to get a thorough picture of overall health. However, it is important to be clear about what blood testing can and cannot do.
Blood tests can provide valuable information about the function of specific organs and systems, the composition of blood cells, metabolic markers, hormones and other circulating substances. They are a genuinely useful tool for health monitoring.
However, a blood test cannot physically examine the heart, joints, lungs or tissues. It cannot rule out structural problems, cancers that do not affect blood markers or conditions that require imaging, biopsies or other investigations. No blood test panel, however comprehensive, constitutes a complete health assessment on its own.
Blood testing is best understood as one component of a broader approach to health monitoring, rather than a definitive test of every system in the body.
General Health Blood Tests: Why Test Selection Matters
A blood test for general health check purposes should reflect your individual circumstances. Factors such as age, family history, lifestyle, existing health conditions and any symptoms you may be experiencing can all influence which tests are most relevant.
For example, someone with a family history of cardiovascular disease may particularly benefit from a detailed lipid profile. An individual experiencing persistent fatigue may find it useful to include iron studies or vitamin B12 alongside a standard FBC. A person over a certain age may wish to include markers associated with kidney function or blood glucose.
Rather than requesting the largest possible panel, a more targeted approach — ideally informed by a healthcare professional — is generally more useful. Broader panels can produce more results, which means more results that fall outside reference ranges for entirely benign reasons, potentially causing unnecessary concern.
If you are considering a health screening package, reviewing what is included and why can help you make an informed decision.
How to Prepare for a Full Blood Test
Preparation for a blood test depends on which specific tests are being performed. There is no single preparation requirement that applies to all blood panels.
General considerations include:
Fasting for a Full Bloods Check: Do You Need to Fast?
Not all blood tests require fasting. Whether fasting is necessary depends entirely on which tests are included in your panel.
Tests that typically require fasting include:
Tests that do not require fasting include:
If you are unsure whether your specific panel requires fasting, check with the clinic or provider before your appointment. If you do need to fast, water is generally permitted and you should take any regular medications as normal unless specifically told otherwise.
Understanding Your Blood Test Results
Blood test results are presented alongside reference ranges, which represent the values typically seen in a healthy population. A result that falls outside a reference range does not automatically mean something is wrong — it may reflect individual variation, temporary factors or simply be at the outer edge of normal for that person.
Results must always be interpreted in context. Factors that influence how a result should be read include:
A single out-of-range result rarely tells the full story. If your results raise questions, the appropriate next step is to discuss them with a qualified healthcare professional rather than attempting self-diagnosis.
Private blood testing services can offer access to results and may provide guidance on interpretation, but they are not a substitute for clinical assessment where results require further investigation.
Private Full Bloods Check: What to Know
Private blood testing allows individuals to access blood tests without waiting for a GP referral and to choose the markers they wish to test. It can be a convenient and accessible way to monitor aspects of general health, particularly for those who want to act promptly or who are not currently under NHS care for the condition they wish to monitor.
Private blood testing is available in London through clinics and services such as Private Blood Tests London, where a range of individual tests and panels are offered.
It is important to note that:
Full Blood Test Cost UK: What Affects Pricing?
The cost of a private full bloods check in the UK varies depending on the number and type of tests included, the provider and the location.
A basic full blood count is typically among the more affordable private blood tests. Broader panels that include liver function, kidney function, cholesterol, thyroid markers and vitamins will naturally cost more because more individual analyses are performed.
To understand current pricing for specific tests and panels, you can review blood test prices directly, as this ensures you have accurate and up-to-date information rather than estimates that may not reflect what is currently available.
When comparing costs, it is worth checking what is included in each panel, whether a clinician review of results is provided and what the turnaround time for results is.
When to Consider a Routine Blood Check Up
There is no single answer to how often someone should have a routine blood check up, as this depends on individual circumstances. That said, blood testing may be worth considering if:
If you have specific symptoms that concern you, always consult a GP. Private blood testing is a useful tool for health awareness but is not a substitute for professional clinical assessment where this is needed.
Frequently Asked Questions
What does a full blood check show?
A full bloods check is an informal term that may refer to different combinations of blood tests. Depending on the panel, it may assess blood cell counts, haemoglobin, liver markers, kidney function, cholesterol, glucose and sometimes thyroid or vitamin markers. The exact tests included vary by panel.
Is a full blood count the same as a full blood test?
Not necessarily. A full blood count (FBC) is a specific test that assesses red cells, white cells and platelets. A broader "full blood test" or "full bloods check" may include many additional tests such as liver function, kidney function and cholesterol, depending on what has been ordered.
What is included in a full blood count?
An FBC typically includes red blood cell count, haemoglobin, haematocrit, red cell indices (MCV, MCH, MCHC), white blood cell count (with differential) and platelet count. It does not include cholesterol, glucose, kidney or liver markers.
Do you need to fast for a full blood test?
It depends on which tests are included. A standard FBC does not require fasting. However, if your panel includes fasting glucose or certain lipid markers, fasting for 8–12 hours beforehand may be required. Always follow the instructions provided by your clinic.
How should I prepare for a blood test?
Stay well hydrated, avoid intense exercise immediately beforehand and follow any specific instructions provided. Inform the clinic of any medications or supplements you take, as these can affect results.
Can a blood test check your whole body?
No. Blood tests provide valuable information about blood composition, organ function and circulating markers, but they cannot assess physical structures, detect all types of cancer or replace imaging or other investigations. A blood test is one part of a broader approach to health assessment.
What blood tests are useful for a general health check?
Useful tests for a general health check typically include an FBC, kidney function, liver function, fasting glucose or HbA1c, a lipid profile and, depending on circumstances, thyroid function and vitamin markers. The most relevant tests will depend on your individual health background.
How much does a full blood test cost in the UK privately?
Private blood test costs vary according to the number and type of tests included. A basic FBC is generally less expensive than a comprehensive multi-marker panel. For accurate, current pricing, check directly with the provider.
Can a blood test detect diabetes?
Blood tests including fasting glucose and HbA1c are used clinically in the assessment of blood sugar regulation. However, a diagnosis of diabetes should always be made by a qualified healthcare professional and confirmed in accordance with current clinical guidelines, not from a single private test result alone.
Can I get a full bloods check without seeing a GP?
In the UK, private blood testing services allow you to access blood tests without a GP referral. However, if your results raise concerns or if you have symptoms that require investigation, you should consult a GP or appropriate clinician.
How long does it take to get blood test results?
Turnaround times vary by provider and by test. Many private blood testing services offer results within one to a few working days. Verify timelines directly with the clinic when booking.
What should I do if my blood test results are abnormal?
An out-of-range result does not automatically mean something is seriously wrong. Results should be interpreted in the context of your overall health, other results and medical history. If you have concerns about your results, discuss them with a GP or qualified healthcare professional who can advise on whether further investigation is needed.
This article is intended for general informational purposes only. It does not constitute medical advice, diagnosis or treatment. Always consult a qualified healthcare professional if you have concerns about your health or blood test results.