Gynecomastia - Differential Diagnosis a nd Workup Algorithm Gynecomastia is common in clinical practice, affecting ~50% of males in puberty and up to 70% of the elderly. When to investigate? How to approach? Labs: TSH, Cr, LFTs, Prolactin, Testosterone, HCG, Estradiol By Dr. Thiago Mendes @mendesthiagob #Gynecomastia #Differential #Diagnosis #Workup #Algorithm #endocrinology