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Medically reviewed by Last updated on Apr 2, 2024.

What is oligoasthenoteratozoospermia (OAT)?

OAT is a condition that includes oligozoospermia (low number of sperm), asthenozoospermia (poor sperm movement), and teratozoospermia (abnormal sperm shape). OAT is the most common cause of male subfertility. Subfertility means a man cannot get a woman pregnant after 1 year of regular sex without birth control.

Male Reproductive System

What causes OAT?

The cause may not be known. The following are possible causes of infertility:

What are the signs and symptoms of OAT?

The main sign is that you did not get your partner pregnant after 1 year of regular unprotected sex. Other signs and symptoms will depend on what is causing your infertility. If you have a varicocele, you will have a mass or swelling on the scrotum that feels like a bag of worms.

How is OAT diagnosed?

Your healthcare provider will ask about your current health and your health in the past. Your provider may need to know how long you and your partner have been trying to get pregnant. Tell your provider when and how often you have sex, and if you have any problems. You will also be asked if you drink alcohol or smoke, and which medicines you use. You may need any of the following:

How is OAT treated?

Treatment will depend on the cause of your OAT. You may have any of the following:

When should I contact my healthcare provider?

Care Agreement

You have the right to help plan your care. Learn about your health condition and how it may be treated. Discuss treatment options with your healthcare providers to decide what care you want to receive. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.