Private Blood Tests and Health Screening in London: Same-Day Results From a GMC-Registered GP

Whether you're concerned about a specific symptom, want a general health MOT, or need blood tests your NHS GP can't arrange quickly enough — private blood testing gives you answers fast.

The Online GP by The Wellness offers same-day blood tests at our Baker Street, Marylebone clinic from £99. Every result is reviewed by a GMC-registered doctor who explains what your numbers mean and what to do about them.

Want to book a blood test or health screening? WhatsApp us now or email team@thewellnesslondon.com. Same-day appointments are frequently available.

Why Choose Private Blood Tests?

The NHS provides excellent blood testing — but access can be slow. Your GP may need to justify the tests to a clinical commissioning group, phlebotomy appointments may be weeks away, and results can take 7-10 days to come back. If your GP decides a test "isn't necessary" based on a brief consultation, you're left without answers.

Private blood tests solve these problems. At The Online GP, you decide what you want tested, the blood is drawn during your appointment, and results are typically available within 24-48 hours. A GMC-registered doctor reviews every result and discusses the findings with you — this is not a faceless lab report. It's a proper medical consultation about what your blood is telling us about your health.

Blood Tests We Offer

Essential Health Panel

The foundation of any health check. Covers the key markers that reveal how your major organs are functioning:

Full blood count (FBC) — measures red cells, white cells, and platelets. Detects anaemia, infection, and blood disorders. 
Liver function tests (LFTs) — checks liver health, important if you drink alcohol, take regular medication, or have unexplained fatigue. 
Kidney function (U&Es) — assesses how well your kidneys are filtering waste. Essential for anyone on blood pressure medication. 
Thyroid function (TSH, free T4) — underactive or overactive thyroid affects energy, weight, mood, and concentration. One of the most commonly missed diagnoses. 
Blood glucose and HbA1c — screens for diabetes and pre-diabetes. HbA1c shows your average blood sugar over 3 months — far more useful than a single glucose reading. 
Cholesterol and lipid profile — total cholesterol, HDL, LDL, and triglycerides. Essential for assessing cardiovascular risk.

Extended Wellness Panel

Everything in the essential panel plus markers that provide a deeper picture of your health:

Iron studies (ferritin, serum iron, transferrin) — fatigue, hair loss, and poor concentration are often linked to iron deficiency, especially in women. 
Vitamin D — deficiency is extremely common in the UK, affecting energy, bone health, immunity, and mood. 
Vitamin B12 and folate — essential for nerve function and red blood cell production. Deficiency causes fatigue, numbness, and cognitive difficulties. 
CRP (C-reactive protein) — a marker of inflammation in the body. Elevated levels may indicate infection, autoimmune conditions, or cardiovascular risk. 
Uric acid — screens for gout risk. 
HbA1c — for diabetes screening.

Specialist Panels

Hormonal profile — testosterone, oestrogen, progesterone, LH, FSH, SHBG. For men and women experiencing fatigue, mood changes, low libido, fertility concerns, or suspected hormonal imbalance. 
Thyroid comprehensive — TSH, free T3, free T4, thyroid antibodies. For anyone with suspected thyroid issues or a family history of thyroid disease. 
Prostate health (PSA) — prostate-specific antigen testing for men over 40 or those with urinary symptoms or family history. 
STI screening — confidential testing for chlamydia, gonorrhoea, syphilis, HIV, hepatitis B and C. Results within 24-48 hours. 
Cancer markers — PSA, CA-125, CEA, and other tumour markers.

Note: tumour markers are screening tools, not definitive diagnoses — your doctor will explain their significance.

Not sure which tests you need? WhatsApp us and our doctors will recommend the right panel based on your symptoms, age, and health history.

Executive Health Check

For busy professionals who want a thorough assessment of their overall health, our executive health check (from £349) combines blood testing with a comprehensive GP evaluation:

Included in the executive health check:

• Comprehensive blood panel (30+ markers including all panels above)

• Resting ECG (heart rhythm assessment)

• Blood pressure and cardiovascular risk assessment

• Body composition analysis

• Full GP consultation with medical history review

• Lifestyle assessment and personalised health advice

• Written medical report

• Follow-up consultation to discuss results

This is not a conveyor-belt health check. It's a thorough, unhurried assessment with a doctor who takes the time to understand your lifestyle, your concerns, and your goals — then provides actionable recommendations.

Our executive health checks are popular with company directors, business owners, high-net-worth individuals, and international patients visiting London who want a comprehensive health review from a trusted private GP.

The Process

1. Book your appointment. WhatsApp, email team@thewellnesslondon.com, or call 020 3951 3429. Let us know what tests you're interested in or what symptoms you'd like investigated.

2. Attend your appointment. Blood is drawn at our Marylebone clinic by experienced phlebotomists. If you're having a fasting blood test (recommended for cholesterol and glucose), attend in the morning before eating. Your doctor can also assess you during the same visit.

3. Receive your results. Most results are available within 24-48 hours. A GMC-registered doctor reviews every result and contacts you to discuss the findings, explain what they mean, and recommend any follow-up needed.

4. Follow-up if needed. If any results need further investigation, we can arrange specialist referrals, additional testing, or a follow-up consultation — all coordinated from our clinic.

Pricing

Test / ServicePrice FromBlood draw + basic panel (FBC, LFT, kidney, thyroid)£99Extended wellness panel£199Individual add-on testsFrom £30 eachSTI screening panelFrom £99Hormonal profileFrom £149Executive health checkFrom £349GP consultation (in-person)From £79

All prices include the doctor's review and explanation of results. No hidden fees.

Why The Online GP for Blood Tests?

Doctor-reviewed results. Every result is reviewed by a GMC-registered doctor — not just sent to you as a raw lab report. You get a medical opinion, not just numbers.

Same-day availability. Book today, get tested today. Results typically within 24-48 hours.

Central London location. Our Baker Street, Marylebone clinic is easy to reach before work, during lunch, or after hours.

International patients welcome. No registration required. Results and reports provided in formats suitable for international insurance and home-country doctors.

Multilingual doctors. Discuss your results in English, Arabic, Spanish, French, or Dutch.

Joined-up care. If your results need further investigation, we arrange specialist referrals and follow-up — you're not left to navigate the system alone.

📱 WhatsApp us now to book your blood test or health screening

📧 Email team@thewellnesslondon.com

📞 Call 020 3951 3429

📍 10 Portman Square, Marylebone, London W1H 6AZ

This article was written by the medical team at The Online GP by The Wellness. Last updated: February 2026. Blood test results should always be interpreted by a qualified medical professional in the context of your individual health history.