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Hello, I would be happy to help answer your question. I am a practicing Urologist and sometimes see patients with similar problems.
Was your prolactin elevated and free testosterone low?
Did your endocrinologist suggest any further testing?
An elevated prolactin level can be from multiple things, one of which is what is called a prolactinoma - a tumor that produces prolactin
The elevated prolactin in the body can suppress GnRH (gonadotropin releasing hormone), which is part of the hormone cascade that eventually produces testosterone.
The free testosterone is the bioavailable (or active) form of the hormone, while the total testosterone is what a combination of free and bound testosterone
The descriptions you gave for penis size, incomplete beard, and gynecomastia are more concerning for hypogonadism
Is that measurement when it is flaccid or erect?
Studies have shown size to vary widely between people and regions, but the generally accepted "average" is between 4-6 inches in length
That being said, your is not considered what is known in the literature as a "micropenis" which is considered to be less than 2 cm (just below 1 inch)...rather, it is on the slightly below average size
How high was your prolactin? Did they measure estrogen?