Low Sex Drive or Erectile Dysfunction? Tests That May Help Identify Underlying Causes
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Learn which hormone, blood sugar, thyroid, and cardiovascular tests may be relevant to ED and low libido.
Browse diagnostic packages or build your own testing panel with NowExpress.
Why testing can be useful
Low libido or erectile dysfunction can be stressful, but it is also common and often treatable. Causes can include stress, sleep problems, relationship factors, alcohol, medications, low testosterone, diabetes, thyroid changes, high blood pressure, and cardiovascular risk.
Because erection quality depends partly on blood flow, ED can sometimes be an early sign that it is worth checking metabolic and heart health markers.
Hormone tests to discuss
A doctor may consider total testosterone, free testosterone, SHBG, LH, FSH, prolactin, and thyroid tests. Testosterone is often checked in the morning because levels can vary during the day.
Hormone results should be interpreted with symptoms and timing. A single number does not automatically explain libido or sexual performance.
Not sure which tests fit your symptoms?
Explore curated screening packages so you can check several relevant markers in one booking.
Blood sugar and heart markers
Fasting glucose, HbA1c, lipid profile, kidney function, liver function, and blood pressure assessment may be relevant. Diabetes, insulin resistance, and cholesterol issues can affect blood vessels and nerve function.
If ED is new or worsening, it is worth looking beyond quick fixes and checking whether there is a broader health signal.
A confidential next step
A men's health testing package can help you check several relevant markers in one booking. Results can then guide a more productive conversation with a healthcare professional about treatment options, lifestyle changes, and follow-up care.
Seek urgent medical help for chest pain, severe shortness of breath, or neurological symptoms. ED medication is not safe for everyone, especially people taking nitrates.
Why ED deserves a health check
ED is often treated as a private performance issue, but it can also be connected to blood flow, hormones, blood sugar, blood pressure, sleep, stress, and medication effects.
Testing can help separate likely physical contributors from lifestyle or situational factors, which makes treatment conversations more useful and less guess-based.
What to ask before taking medication
If you are considering ED medication, your clinician needs to know about heart disease, chest pain, blood pressure medications, nitrates, recreational drug use, and eye or hearing problems.
Testing does not replace that safety review. It supports it by checking metabolic and hormone markers that may influence the plan.
Lifestyle factors that affect results
Alcohol, poor sleep, stress, smoking, inactivity, and weight gain can all affect libido and erectile function. Lab results are more useful when interpreted alongside these factors.
If testosterone is being checked, morning collection is often preferred. Repeat testing may be needed before making treatment decisions.
Frequently asked questions
Is low testosterone the main cause of ED?
Not always. ED can involve blood flow, nerves, stress, medications, diabetes, and heart risk. Testosterone is only one possible factor.
Can diabetes affect erections?
Yes. High blood sugar over time can affect blood vessels and nerves involved in erections.
Are ED medications safe for everyone?
No. They can be unsafe with nitrates and certain heart conditions. A healthcare professional should review suitability.
Lab tests are educational tools and do not replace medical evaluation. If you have severe, sudden, or worsening symptoms, seek medical care promptly.
Ready to take the next step?
Book your laboratory tests online and receive your results via email. Your results should be reviewed with a healthcare professional, especially if symptoms are ongoing or results are abnormal.