Blood Tests for Men Over 55: What to Check and Why

There is no single four-test panel that every man must have at 55. The right tests depend on symptoms, medical history, medicines, family history, body weight, blood pressure and whether testosterone therapy is being considered or used.

For general and sexual health, cardiovascular and diabetes risk often deserve as much attention as hormone levels. Erectile dysfunction can be an early sign of vascular or metabolic disease, while tiredness and low libido can have causes ranging from poor sleep and medication effects to depression, thyroid disease or true testosterone deficiency.

Start With Risk, Symptoms and Treatment History

A useful review starts with a consultation, not a shopping list. Your clinician should ask about erectile function, libido, energy, sleep, urinary symptoms, exercise, alcohol, smoking, medicines and family history. Blood pressure, waist or body-mass assessment and a cardiovascular risk calculation may be as important as any laboratory result.

The European Association of Urology guideline on erectile dysfunction recommends checking glucose or HbA1c, lipids and morning total testosterone when these have not been assessed recently. Additional tests should be guided by the individual clinical picture.

1. Lipid Profile: Cardiovascular Risk Matters

A lipid profile usually includes total cholesterol, LDL cholesterol, HDL cholesterol and triglycerides. These results help estimate the risk of heart attack and stroke when considered with age, blood pressure, diabetes, smoking and other factors.

High cholesterol does not always cause symptoms, and an isolated result should not be interpreted as “good” or “bad” without the wider risk picture. Treatment decisions may involve lifestyle changes, medication or both. Improving cardiovascular health supports long-term health and can also benefit erectile function, but a cholesterol result alone does not diagnose the cause of ED.

2. Glucose or HbA1c: Screen for Diabetes When Appropriate

Fasting glucose and HbA1c are commonly used to detect diabetes or prediabetes. HbA1c reflects average glucose exposure over roughly the previous two to three months, although anaemia, kidney disease, haemoglobin variants and some other conditions can affect interpretation.

Screening is especially relevant for men with overweight or obesity, high blood pressure, a family history of diabetes or other metabolic risk factors. The USPSTF recommends diabetes screening for adults aged 35 to 70 with overweight or obesity. Local guidance and individual risk may support testing outside that group.

Diabetes can affect blood vessels and nerves involved in erections. Finding it early matters for the heart, kidneys, eyes and nerves—not only for sexual performance.

3. Testosterone: Test Symptoms, Not Age Alone

Routine testosterone screening is not recommended for every asymptomatic man. Testing is reasonable when symptoms or signs suggest testosterone deficiency, such as persistently low sexual desire, fewer spontaneous erections, unexplained anaemia, reduced muscle mass or specific reproductive or pituitary concerns.

A diagnosis should not be made from one random result. The Endocrine Society guideline recommends symptoms plus unequivocally and consistently low testosterone, confirmed with a repeat early-morning fasting total testosterone test. Illness, poor sleep, calorie restriction and some medicines can temporarily lower the result.

When Is Free Testosterone Useful?

Total testosterone is the usual first test. Free testosterone can help when total testosterone is near the lower limit or when sex hormone-binding globulin (SHBG) may be abnormal. A calculated value based on total testosterone, SHBG and albumin is often more reliable than some direct free-testosterone assays.

Free testosterone is not automatically “the number that matters most,” and neither total nor free testosterone should be interpreted without symptoms and the laboratory method. If low testosterone is confirmed, further tests such as luteinising hormone, follicle-stimulating hormone and sometimes prolactin help identify the cause before treatment is considered.

4. Full Blood Count and Haematocrit: Especially Important With TRT

A full blood count includes haemoglobin and haematocrit, the proportion of blood volume made up by red blood cells. Haematocrit is not simply a “blood thickness” test, and a high value does not by itself explain erectile dysfunction.

Testosterone therapy can increase red-cell production, so haemoglobin and haematocrit should be checked before treatment and monitored afterwards. An elevated result may require dose adjustment, a change in formulation, temporary interruption and assessment for contributors such as smoking, dehydration, lung disease or sleep apnoea. The monitoring interval should be set by the prescriber rather than reduced to a universal schedule.

Men not using testosterone may still need a full blood count when anaemia, infection, bleeding or another condition is suspected. It is not necessarily an annual test for every healthy person.

What About PSA?

Prostate-specific antigen (PSA) is a blood marker produced by prostate tissue. A raised level can occur with prostate cancer, benign enlargement, inflammation, recent instrumentation and other factors. It is not a general “prostate health score,” and one result cannot diagnose or exclude cancer.

For men aged 55 to 69 without symptoms, PSA screening should be an individual decision after discussing possible benefits and harms. The USPSTF screening summary highlights false-positive tests, biopsy complications, overdiagnosis and treatment effects alongside the possibility of reducing prostate-cancer death in some men. Family history, African ancestry, general health, life expectancy and personal preferences affect the decision.

PSA and prostate-risk assessment may also be discussed before testosterone therapy and during monitoring. This does not mean PSA testing is “non-negotiable” for every man over 55. Urinary symptoms or an abnormal prostate examination require clinical evaluation regardless of screening preferences.

Is Estradiol a Routine Test for Men?

Estradiol has important roles in male bone and sexual health, but it is not a routine screening test for every man with fatigue, low libido or ED. Measurement may be useful in selected situations, including breast symptoms, suspected hormone disorders or problems arising during testosterone treatment.

Symptoms such as fatigue, low mood, fluid retention or erection changes are not specific enough to diagnose “high” or “low” estradiol. Treatment should not aim for an internet-derived ratio or target without a qualified clinician establishing why the test is needed.

Other Tests May Be More Relevant

Depending on history and symptoms, a clinician may consider kidney and liver function, thyroid-stimulating hormone, prolactin, iron studies, vitamin B12 or other tests. Medication review is essential because antidepressants, blood-pressure medicines, opioids, prostate treatments and other drugs can affect energy or sexual function.

Testing should answer a clinical question. Large untargeted panels can produce borderline abnormalities that lead to anxiety and unnecessary follow-up without improving health.

Blood Tests Are Only Part of an ED Assessment

Erectile dysfunction can reflect vascular disease, diabetes, medication effects, nerve injury, hormonal problems, psychological factors or several causes together. A good assessment includes symptom history, blood pressure, cardiovascular risk and physical examination alongside selected tests. Review our comparison of non-surgical ED treatments and the erectile dysfunction programme.

How to Prepare for Testing

• Ask whether fasting is required for the tests ordered.
• Schedule testosterone sampling early in the morning and repeat a low result as advised.
• Bring a list of prescription medicines, supplements and testosterone or anabolic products.
• Tell the clinician about acute illness, poor sleep, recent intense exercise or dehydration.
• Do not stop prescribed medicine or testosterone before testing unless the prescriber instructs you to.
• Interpret trends using the same laboratory where practical, but investigate meaningful changes rather than chasing an “optimal” number.

Frequently Asked Questions

Does every man over 55 need testosterone testing?

No. Guidelines recommend against routine population screening. Testing is most useful when compatible symptoms or clinical signs are present.

Is one low testosterone result enough?

No. Diagnosis generally requires compatible symptoms and at least two low early-morning results obtained with an accurate assay, followed by investigation of the cause.

Should every man have a PSA test at 55?

Not automatically. Men aged 55 to 69 should make an informed, individual decision with a clinician after considering risk, likely benefit and possible harms.

Can blood tests find the cause of ED?

They can identify contributors such as diabetes, abnormal lipids or testosterone deficiency, but they are only one part of the assessment. Normal blood results do not rule out vascular, neurological, medication-related or psychological causes.

Book a Men’s Health Assessment

Shockwave Clinic offers confidential assessment in Cape Town and Johannesburg. Testing should be selected and interpreted in the context of your symptoms, risks and current treatment—not sold as a fixed “optimisation” panel.

Request an appointment or view our blood-testing service. This article provides general health information and does not replace individual medical advice, diagnosis or treatment.