Can Your Blood Sugar Be Normal While Your Insulin Is High?
When patients think about diabetes or metabolic health, they usually think of blood sugar. That is understandable: glucose is one
Blood Tests > Diamond Blood Test
The next step from our popular Platinum blood profile is our fully comprehensive Diamond Blood Test, designed to give you a great overview of your current health and help you understand your future health risks, including diabetes, heart attacks and strokes.
The Diamond Blood Profile gives outstanding insight into your future risk by testing several important biomarkers.
Fasting insulin measures the insulin level in the blood after a period without food. Elevated fasting insulin levels can indicate insulin resistance, a precursor to type 2 diabetes and metabolic syndrome.
A study published in the Journal of Clinical Endocrinology & Metabolism found that individuals with high fasting insulin were at a significantly greater risk of developing diabetes, even if their blood sugar levels remained normal.
ApoA1 is a major high-density lipoprotein (HDL) component, often called “good” cholesterol. Higher levels of ApoA1 are associated with a lower risk of cardiovascular disease.
Recent findings indicate that ApoA1 may play a role in cardiovascular risk assessment beyond traditional lipid panels. A study in Circulation demonstrated that elevated ApoA1 levels correlated with a reduced incidence of heart attacks, suggesting its potential as a valuable biomarker for cardiovascular health.
ApoB is the primary low-density lipoprotein (LDL) protein, or “bad” cholesterol. It is a critical marker for assessing cardiovascular risk, as each ApoB-containing lipoprotein particle can contribute to atherosclerosis.
A meta-analysis published in the European Heart Journal revealed that ApoB levels are a stronger predictor of cardiovascular events than traditional LDL cholesterol measurements. This underscores the importance of measuring ApoB in evaluating cardiovascular risk and tailoring treatment strategies.
Lp(a) is a type of lipoprotein that carries cholesterol in the blood and is genetically determined. Elevated levels are associated with an increased risk of heart disease and stroke.
Recent research has highlighted the significance of Lp(a) in cardiovascular risk, especially in individuals with a family history of heart disease. A study in The Journal of the American College of Cardiology found that high Lp(a) levels independently predicted cardiovascular events, prompting calls for routine measurement in high-risk populations.
Lp-PLA2 is an enzyme associated with inflammation and atherosclerosis. Elevated levels may indicate plaque instability and increased cardiovascular risk.
A study published in the journal Stroke showed that higher Lp-PLA2 levels were linked to an increased risk of stroke and cardiovascular events. This finding emphasizes the potential for Lp-PLA2 as a therapeutic target and a risk marker in cardiovascular disease management.
hs-CRP is a marker of inflammation in the body. Elevated levels are associated with an increased risk of cardiovascular disease and other inflammatory conditions.
Fibrinogen is a protein involved in blood clotting. Elevated fibrinogen levels can indicate an increased risk of thrombosis and cardiovascular events.
A cohort study in the journal Blood found a strong association between elevated fibrinogen levels and the risk of heart disease and stroke. This highlights the importance of fibrinogen as a potential target for intervention in at-risk individuals.
Homocysteine is an amino acid that, at elevated levels, is linked to an increased risk of cardiovascular disease, stroke, and other health issues.
A systematic review in The American Journal of Clinical Nutrition demonstrated that high homocysteine levels are associated with cognitive decline and dementia, indicating its broader implications for health beyond cardiovascular risk.
Understanding your cardiac risk is more crucial than ever, as heart disease remains one of the leading causes of death in the UK and across the globe. While many people may think of heart health as something to consider only in later years, the reality is that heart disease can affect individuals of all ages. Testing is vital in assessing heart health and preventing potential issues before they become serious.
Early Detection Saves Lives
One of the most compelling reasons to undergo cardiac testing is the potential for early detection of heart conditions. Many cardiac issues, such as high cholesterol, high blood pressure, and even coronary artery disease, often develop without noticeable symptoms. Regular testing can reveal these silent threats, allowing for timely interventions that can significantly reduce the risk of heart attacks, strokes, and other severe complications.
Use our online booking engine or book your test by giving us a call.
On the online booking engine select the “appointment type” you need.
You will be seen by one of our friendly phlebotomists or trained clinicians.

At our London-based clinic, we recommend fasting for 6 to 8 hours before your test while staying well-hydrated.

Your blood will be taken by an experienced clinician.

Most of your results will return in 12 hours. Your cardiac risk markers may take 3 – 5 days for the results to become available.
No
Hidden Charges
Transparent fees. The price you see is the price you pay.
No GP consultation
needed
No GP appointment requirement for blood tests
Established
since 1998
Experienced doctors & a professional team.
Strictly
confidential
Your medical records are kept private at all times.
All reviews4.8![]()
Trustindex5.0
Provenexpert5.0
Yell5.0Posted on Google![]()
Jooyoung Nam10 September 2026Trustindex verifies that the original source of the review is Google.
I had a very positive experience at this clinic for my blood test and the follow-up with the GP. I particularly appreciated the care and attention throughout the process, including the follow-up after my results. Thank you to the team for making the experience so reassuring. I would happily recommend this clinic.Posted on Google![]()
Lucy Cropper31 August 2026Trustindex verifies that the original source of the review is Google.
I had a fantastic experience at the Harley Street clinic. Staff were very welcoming and professional and booked my second blood test here also.Posted on Google![]()
Truman Packard19 August 2026Trustindex verifies that the original source of the review is Google.
The service was efficient, personable and very complete. The doctor who saw me was very good, patient and sensitive. I’ll be going back.Posted on Google![]()
Sue Heald11 August 2026Trustindex verifies that the original source of the review is Google.
As an international visitor, I was very grateful for the prompt attention to my request for an appointment. Dr Ali was respectful and empathetic in regard to my condition and suggested further treatment, which I was able to organise for the next day. Both offices I attended treated me appropriately and I would recommend Harley Street Health Walk-in Clinics to anyone visiting London who requires medical attention.Posted on Trustindex![]()
Isabella Johnson3 August 2026Trustindex verifies that the original source of the review is Trustindex.
Highly recommend City Walk-In Clinic Really pleased with my experience at City Walk-In Clinic. I booked a female hormone test because I wanted some answers about a few symptoms I'd been having, and the whole process was straightforward. The staff were welcoming, friendly and didn't make me feel rushed at all. The blood test was quick, and they explained everything clearly before taking the sample. My results came back sooner than I expected, and it was reassuring to have everything presented in a way that was easy to understand. I'd definitely use the clinic again and would recommend it to anyone looking for a private female hormone test. Professional service, lovely staff and an all round positive experience.Posted on Google![]()
Anabella Styles9 July 2026Trustindex verifies that the original source of the review is Google.
I had a private gp appointment yesterday as my feet have been swelling every day over the past few days. So I booked an appointment with Dr Heather. Dr Heather explained the possible causes of the swelling, including the heat that we are currently experiencing in London. Recommended further investigation if the swelling persists, to identify the underlying issue rather than just making assumptions.Posted on Google![]()
Mary Anne3 July 2026Trustindex verifies that the original source of the review is Google.
I have used City Walk In Clinic as my go to place for routine blood tests. My recent full health check gave my doctor some clues that i may be approaching my menopause era. So my doctor has recommended that i do some tests to find out if indeed i am entering perimenopause, as the symptoms are there. Will be having my tests in the next few weeks. So glad i had a full health check, because all these symptoms were driving me crazy.Posted on Google![]()
Dona P24 June 2026Trustindex verifies that the original source of the review is Google.
Really good service throughout. Reception staff were welcoming and the blood test was efficient and quick. Highly recommended as blood tests can be booked on the day with results being sent very quickly.Posted on Google![]()
A B23 June 2026Trustindex verifies that the original source of the review is Google.
Great location for blood tests if you want very fast results! I got my results the same day, highly recommend!Posted on Google![]()
Grace Vizcaino2 June 2026Trustindex verifies that the original source of the review is Google.
Very good service at a very reasonable cost. Same day results, I do recommend this clinic and would certainly be using it again.Posted on Google![]()
Shona McGovern16 May 2026Trustindex verifies that the original source of the review is Google.
I attended The Harley Street Walk/in centre in the City recently. I was able to book my appointment the day before for a blood test at a time that suited me. The booking process was straightforward. The doctor that conducted the venous draw was efficient and very pleasant. I have never had such a painless venous draw and I have had many! My appointment was at 5pm and I had my results before 8 am the following day. I will be very happy to book my tests here in the future. Thank you.Posted on Google![]()
Monju Zaman19 April 2026Trustindex verifies that the original source of the review is Google.
Very easy to arrange the appointment with plenty of immediate availability. Very convenient location. Friendly medical associate who took my blood and results arrived very promptly, ie early the next day. Seamless experience.Posted on Google![]()
Nat N17 April 2026Trustindex verifies that the original source of the review is Google.
Attentive, welcoming and professional staff in a great area which is easy to get to! I always feel like I'm in good handsPosted on Google![]()
Abdalla Mohamud Mohamed18 March 2026Trustindex verifies that the original source of the review is Google.
I had a very good experience at the clinic. The staff were punctual friendly and professional. I had a blood test done and received the results quickly on the same day. I would definitely recommend visiting them.Posted on Google![]()
Ena Quinn9 March 2026Trustindex verifies that the original source of the review is Google.
Speedy and efficient place for quick bloods. Results have been same day for me. Very friendly staff too which is always a bonusPosted on Google![]()
Arthur Attwell22 January 2026Trustindex verifies that the original source of the review is Google.
Great experience. I was visiting London from abroad and I needed a blood test before travelling onward. I arrived without an appointment and was done in 20 minutes. The staff were all lovely. I received my test results by email the next morning.Posted on Google![]()
Omar19 January 2026Trustindex verifies that the original source of the review is Google.
Really professional and friendly. They always provide their results quickly!Posted on Google![]()
Antigoni S.17 January 2026Trustindex verifies that the original source of the review is Google.
Very good experience — all the staff were very polite, I was assisted immediately, and the results were available the same day. Thank you very much Private City Clinic!Posted on Google![]()
Sheila Daley31 December 2025Trustindex verifies that the original source of the review is Google.
I wanted a cholesterol check up and chose this clinic because it seemed to offer a competitive price for a detailed report. And so it turned out to be. Received a prompt and professional service at a price that was significantly less than other nearby providers in central London. I have now used it twice and would definitely recommend.Posted on Yell![]()
JenniferP-34418 February 2025Trustindex verifies that the original source of the review is Yell.
I appreciated the discreet and professional care during my sexual health test. The clinic made me feel safe and respected, and the results were delivered quickly and privately. Definitely recommend if you value confidentiality.Posted on Yell![]()
MichelleD-1121 February 2024Trustindex verifies that the original source of the review is Yell.
I can't express enough how pleased I am with the Private Walk-in Clinic. As someone who values privacy and comfort, this clinic hits all the marks. The waiting areas are designed for relaxation, and the staff ensures confidentiality at every step.Posted on Provenexpert![]()
Anonymously4 December 2023Trustindex verifies that the original source of the review is Provenexpert.
The Walk-In Clinic in central London exceeded my expectations in every way. Their attention to detail and commitment to tailored care for their patients truly sets them apart. The availability of evening appointments until 6:30 pm was a game-changer for someone like me juggling multiple commitments.Posted on Yell![]()
LunaW2314 May 2021Trustindex verifies that the original source of the review is Yell.
They are so fast. One call and I am there in a few hours, always the same team and so polite and nice.Posted on Yell![]()
JuliaSf14 October 2020Trustindex verifies that the original source of the review is Yell.
I hope these guys open up again soon because I really cannot stand anyone else around here. they were perfect for me for tests and consultations whenever I needed themPosted on Yell![]()
Emily-M2 August 2019Trustindex verifies that the original source of the review is Yell.
i have used these guys many times in the last 6 years and its always very fast and professional. most tests are done in 24hours and they call you to explain the results. recommended if you gp (like mine) gives you an appointment in 4 weeks time.
Full Blood Count
Cholesterol Profile
Kidney Function
Fasting Glucose
Liver Function
Muscle Damage Markers
Iron Profile
Vitamin D Level
Thyroid Function
Diabetes Screen
Vitamin B 12
Folate
C-Reactive Protein
Fasting Insulin
Advanced Cardiac Profile
We offer a wide range of private blood tests in London. Same-day appointments are available 5 days a week.
We work with experienced consultants & healthcare professionals who have received positive feedback from our patients, and with whom we have established long-term relationships.
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