Testosterone Levels Test

The testosterone levels test, also known as a testosterone test or serum testosterone test, is a medical procedure used to measure the level of testosterone in the blood.

Purpose

The purpose of the testosterone levels test is to:

• Diagnose low testosterone (hypogonadism) in men
• Evaluate infertility or erectile dysfunction in men
• Monitor testosterone levels in men undergoing hormone replacement therapy
• Diagnose and monitor conditions such as polycystic ovary syndrome (PCOS) in women
• Monitor testosterone levels in individuals with certain medical conditions, such as pituitary gland disorders

Procedure

The testosterone levels test is typically performed by drawing a blood sample from a vein in the arm.

• A healthcare professional will clean the area where the blood sample will be drawn
• A needle will be inserted into the vein, and a small amount of blood will be collected in a tube
• The blood sample will be sent to a laboratory for analysis

Types of Testosterone Tests

There are two main types of testosterone tests:

• Total testosterone test: measures the total amount of testosterone in the blood, including both free and bound testosterone
• Free testosterone test: measures the amount of testosterone that is not bound to proteins in the blood

Interpretation of Results

The results of the testosterone levels test will be compared to a reference range, which varies depending on the laboratory and the individual's age and sex.

• Normal testosterone levels for adult men: 300-1,000 ng/dL
• Normal testosterone levels for adult women: 15-70 ng/dL

Risks and Side Effects

The risks and side effects of the testosterone levels test are minimal, but may include:

• Pain or bruising at the needle site
• Dizziness or lightheadedness
• Infection (rare)