What blood tests can show
Blood tests are one of the most useful windows into how your body is working. Common panels look at cholesterol and cardiovascular risk, blood sugar and HbA1c for diabetes risk, thyroid function, liver and kidney markers, full blood count, and vitamin or iron levels such as B12, vitamin D and ferritin.
Why people choose a private test
The main reasons are speed and convenience — no wait for a referral, appointments that fit around work, and the ability to check a specific concern such as tiredness or a family history. It is not a replacement for NHS care; it sits alongside it, and anything significant is directed back to your GP.
Do you need to fast?
It depends on the test. Cholesterol and glucose panels often ask for a fasting sample — typically no food for 8 to 12 hours, water only — while many others do not require fasting at all. South London Clinic, South London, will tell you exactly what your test needs when you book, so you do not turn up unprepared.
How to read the results
Results come with reference ranges, but a number just outside a range is not automatically a problem, and a normal number does not always rule one out. That is why the pharmacist talks you through what the results mean in the context of your symptoms and history — a single test is a snapshot in time.
When to see a doctor instead
If you have red-flag symptoms — chest pain, severe or sudden symptoms, unexplained weight loss — you should seek medical care directly rather than waiting for a routine test. A blood test is for monitoring and investigation, not emergencies.
Common questions
