Lab tests

If appropriate, your doctor may order one or more of the following diagnostic tests:

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• Complete blood count (CBC). Your doctor can check for signs of underlying conditions such as anemia, a condition caused by a low red blood cell count that can cause fatigue, which in turn can cause ED.
• Liver and kidney function test. These blood tests may indicate whether problems with your kidneys or liver are causing your erectile dysfunction.
• Lipid profile. This test measures the level of lipids (fats) such as cholesterol in your blood. High levels of certain lipids may indicate atherosclerosis, a condition where arteries harden, which can affect blood circulation in the penis.
• Thyroid function test. Thyroid problems may cause or contribute to erectile dysfunction.
• Blood hormone studies. Blood hormone studies measure testosterone and/or prolactin levels to look for any abnormalities with these sex hormones. Blood LH and FSH levels evaluate the pituitary's role in regulating these hormones.
• Urinalysis. Analysis of urine can provide information about protein and sugar in the urine. If present, these substances could indicate diabetes or kidney disease, which can cause erectile dysfunction.

This section also contains information on additional special diagnostic tests.