Lab results led to subclinical hypothyroidism diagnosis. treated for mdd, anxiety, ptsd. should it be further examined? chances of infertility?

Labs alone =Dx???: History which includes symptoms over time family history and physical exam almost always trump lab results alone. Once a good history and physical are done then testing. Other endocrine disorders should be considered. However all alcohol/substances? Need to be stopped first and current meds reassessed after a new baseline mental status achieved. If appropriate, adrenal gland function may need test.

Hypothyroidism: I can't respond to the entirety of your question. One thing is clear, in cases of hypothyroidism, augmentation with thyroid can sometimes be very beneficial in terms of obtaining more robust improvement of depression. Good luck.