What to expect from a blood test for erectile dysfunction

Depending on your age, symptoms, and medical history, testing may include glucose or a longer-term blood sugar marker, cholesterol, kidney and liver function, blood count, and testosterone. If testosterone is low, the timing of the sample and related hormones may need review. Results do not explain every erection problem: medicines, circulation, nerve function, mood, relationships, and sleep can also matter. Your clinician combines the blood results with a confidential sexual and general health assessment.

Ask whether the test requires fasting or a morning appointment, particularly if hormones are being assessed. Bring a list of prescribed medicines, supplements, and recreational substances, and mention changes in desire, erections, ejaculation, urination, energy, and mood. Do not stop medicine without advice. The blood draw is brief; mild bruising or tenderness can follow.

Arrange a clinical review if erection changes persist, happen with reduced exercise tolerance, or occur alongside increased thirst, urinary changes, numbness, or chest symptoms. Seek urgent help for chest pain, severe breathlessness, sudden weakness, or an erection lasting several hours with significant pain. These problems need prompt assessment rather than waiting for routine results.

Which blood tests are relevant to my symptoms? Should testosterone be checked in the morning or repeated? Could any medicine or supplement contribute? Do I need assessment of blood pressure, circulation, mood, or urinary symptoms as well?