Erectile dysfunction affects an estimated 4.3 million men in the UK. Most treat it with a pill and move on. But ED is frequently the earliest symptom of cardiovascular disease, insulin resistance, or hormonal decline. The usual GP response, a Viagra prescription, treats the symptom and ignores the cause. A blood test finds the cause.
This is the most important thing most men never hear. Penile arteries are 1 to 2mm in diameter. Coronary arteries (the ones that supply your heart) are 3 to 4mm. Carotid arteries (neck, supplying your brain) are 5 to 7mm. When atherosclerosis (arterial plaque buildup) develops, it obstructs the smallest arteries first. Erectile dysfunction is often the first symptom of a process that is simultaneously developing in your heart and brain.
Vlachopoulos et al. (European Heart Journal, 2013) found that ED typically appears approximately 3 years before a cardiovascular event. Three years. That is a window of opportunity. If ED prompts a comprehensive blood test that reveals elevated ApoB, high Lp(a), or insulin resistance, those 3 years become 3 years of intervention. If ED prompts nothing but a prescription, those 3 years are wasted.
A meta-analysis of over 90,000 men found that ED was associated with a 48% increased relative risk of future cardiovascular events, independent of traditional risk factors like smoking, obesity, and cholesterol. ED is not just a risk factor. It is an independent predictor. Ignoring it is ignoring the earliest signal your body sends.
Source: Vlachopoulos et al., European Heart Journal 2013; Jackson, Int J Clin Pract 2013. Artery size hypothesis.
When a man presents with ED, the typical GP response is a testosterone test and, if that's "normal," a PDE5 inhibitor prescription (Viagra, Cialis). But testosterone is one of four categories of cause. Testing it alone is like diagnosing an engine problem by checking only the oil level.
Atherosclerosis, endothelial dysfunction, and microvascular disease reduce blood flow to the penis. This is the mechanism behind the artery size hypothesis. ApoB (the best predictor of atherosclerotic risk), Lp(a) (a genetic cardiovascular risk factor, test once in a lifetime), hs-CRP (endothelial inflammation), and homocysteine are the markers that reveal vascular ED. The NHS rarely tests any of these for ED. Cardiovascular blood test guide.
Low testosterone, high SHBG (reducing free testosterone), elevated prolactin (which directly suppresses libido and erectile function), oestradiol excess (from aromatisation in abdominal fat), and thyroid dysfunction all cause or contribute to ED. The NHS tests total testosterone only. It does not test SHBG, free testosterone, prolactin, oestradiol, or thyroid for ED. BSSM guidelines define the treatment threshold at 8 nmol/L, with the grey zone at 8 to 12 nmol/L. Low libido blood test guide. Testosterone blood test guide.
Insulin resistance and type 2 diabetes are major causes of ED. Diabetes damages blood vessels and nerves directly. Insulin resistance impairs nitric oxide production, the mechanism that enables erections. HbA1c catches diabetes, but fasting insulin and HOMA-IR detect the insulin resistance that precedes it by years. Men with ED should have their metabolic health tested comprehensively, not just HbA1c. Prediabetes blood test guide.
Performance anxiety, depression, relationship stress, and chronic stress (cortisol elevation) all cause ED. A blood test cannot diagnose psychological ED directly, but it can rule in or rule out the physical causes. If a comprehensive panel shows normal hormones, normal metabolic markers, and normal cardiovascular markers, the cause is likely psychological, and treatment can focus there with confidence rather than guessing. Stress blood test guide.
This is one of the most damaging sentences in UK healthcare. A young man presents with ED. His GP runs a basic testosterone test. It comes back "normal." The GP concludes it must be psychological and refers him for sexual therapy. The man spends months or years believing his problem is mental, when the cause was biochemical the entire time and sitting in a blood marker that was never tested.
Prolactin is the most commonly overlooked hormonal cause of ED, particularly in younger men. It is not included in standard GP blood panels for erectile dysfunction. Yet elevated prolactin directly suppresses GnRH (gonadotropin-releasing hormone), which shuts down testosterone production and kills libido and erectile function. A man can have "normal" total testosterone and still be profoundly affected if his prolactin is elevated, because prolactin independently suppresses sexual desire and arousal through separate neurological pathways.
Causes of elevated prolactin include prolactinoma (a benign pituitary tumour, more common than most people realise), certain medications (antidepressants, antipsychotics, some blood pressure drugs), hypothyroidism (another marker GPs rarely test for ED), chronic stress, and even strenuous exercise. A prolactinoma is typically treatable with medication (cabergoline or bromocriptine) and most men see dramatic improvement in libido and erectile function once prolactin normalises.
The NHS pathway for ED almost never includes prolactin testing unless a specialist specifically requests it. By the time a specialist is involved, months or years have passed. The man has been in sexual therapy for a hormonal problem. He's been told it's anxiety, stress, performance pressure, relationship issues. He's started to believe it. His confidence is damaged. His relationship may be damaged. And the entire time, a single blood test would have identified the cause.
If you've been told your ED is psychological and nobody has tested your prolactin, LH, FSH, oestradiol, thyroid, and free testosterone, the investigation was incomplete. You were not given a psychological diagnosis. You were given an untested assumption. A comprehensive blood panel takes 48 hours and either confirms the physical cause or genuinely rules it out. Either answer is better than guessing.
ED is one of the most under-reported health concerns in UK men. Many men avoid their GP entirely because the conversation feels uncomfortable, embarrassing, or emasculating. Research suggests that men wait an average of 2 to 5 years before seeking help for ED symptoms.
Private blood testing removes that barrier. You book online. You attend a clinic near you (103+ locations across the UK) or arrange at-home phlebotomy so nobody knows. Results arrive in 48 hours to your secure dashboard. No GP referral needed. No waiting room. No awkward conversation. Just data.
If the results reveal something that needs medical attention (low testosterone, elevated cardiovascular risk, insulin resistance), you take the report to your GP. The conversation changes completely when you arrive with 114 biomarkers of data. You're not asking for help. You're presenting evidence. For most men, that reframe makes the conversation manageable.
If the results are all normal, you've ruled out the physical causes and can focus on the psychological and lifestyle factors with genuine confidence that nothing else is going on.
ED in men under 40 affects an estimated 10 to 30% depending on the study, though the real figure is likely higher due to underreporting. In younger men, ED is a stronger cardiovascular warning signal than in older men, because it occurs in the absence of age-related arterial stiffening. If your arteries are clogging at 32, that is a more urgent signal than if they're clogging at 65.
Younger men with ED are also more likely to have lifestyle-driven insulin resistance, cortisol-related hormonal suppression from work stress, and vitamin D deficiency from desk-based work and limited sun exposure. These are all correctable. But they need identifying first.
The reluctance to seek help is also stronger in younger men. The perception that ED is an "old man's problem" creates a barrier to testing that delays investigation and allows underlying conditions to progress. A private blood test bypasses this entirely. Men's health blood test guide.
114 biomarkers covering hormones, cardiovascular risk, metabolic health, and inflammation. No GP referral. No waiting room. Results in 48 hours.
.png)