How do you check for gyno?

How is gynecomastia diagnosed?
  1. Blood tests, including liver function tests and hormone studies.
  2. Urine tests.
  3. A low-dose X-ray of your breast (mammogram)
  4. A small breast tissue sample (a biopsy) may be removed and checked for cancer cells.

How do I know if its gyno or fat?

With gynecomastia, a hard lump can be palpated or felt under the nipple/areola region. The lump typically is firmer than fat. This is one of the best ways to tell it apart from pseudogynecomastia. This lump may also be painful or sensitive to the touch.