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Andrology
What is Erectile Dysfunction?
Prevalence of ED
Physiology of Erection
Causes of Impotence, Part I
Causes of Impotence, Part II
Diagnosing Erectile Dysfunction
›› Lab Tests for ED
Erectile Dysfunction Treatments
ED Treatments, Part II
Erectile Dysfunction Resources
Medical Info
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Main > Specialty Areas > Andrology >
Erectile Dysfunction or Impotence

Lab Tests for ED

Several laboratory tests for blood counts, urinalysis, lipid profile, and measurements of creatinine and liver enzymes can help diagnose ED. Also, measuring the amount of free testosterone in the blood is indicated especially in patients with decreased sexual desire, as it can yield information about problems with the endocrine system. Some of the important tests are:

  • Complete blood count (CBC) of red cells and white cells is used to evaluate the presence of anemia. A low level of red cells limits the body's utilization of oxygen and can lead to fatigue and general malaise. The level of blood lipids (fats) such as cholesterol and triglycerides may indicate arteriosclerosis, which can reduce blood flow to the penis.
  • Blood tests can indicate conditions that may interfere with normal erectile function. These tests measure hormone levels, cholesterol, blood sugar, liver and kidney function, and thyroid function. Excess prolactin (hyperprolactinemea) can lower testosterone levels, which can diminish libido. Both of these levels are measured, as well as levels of other sex hormones. If they are persistently low, an endocrinologist (hormone specialist) should be consulted.
  • Liver and kidney function tests - Liver and kidney disease can create hormonal imbalances. Blood tests for liver function involve analysis of enzyme and serum creatinine levels, which are indicators of kidney efficiency.
  • Thyroid function tests - Thyroid hormones regulate metabolism and the production of sex hormones; a deficiency may contribute to impotence.
  • Urinalysis - Urine is analyzed for protein (albumin), sugar (glucose), and hormone (testosterone) levels that may indicate diabetes mellitus, kidney dysfunction, and testosterone deficiency.
  • Erectile Function Tests - Tests that assess erectile function examine the blood vessels, nerves, muscles, and other tissues of the penis and pelvic region.
  • ‹‹ Diagnosing Erectile Dysfunction Erectile Dysfunction Treatments ››

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