Are you on trt from a doctor?
If so the doctor should know what’s going on.
If your doctor isn’t knowledgeable about Mens health then start with this list.
Do this every year or twice a year
Total Testosterone
Free Testosterone
SHBG
DHEA
Estrogen
Progesterone
Prolactin
TSH
T3
T4
LH
FSH
25 hydroxy vit D
Fasting glucose
Fasting insulin
Fasting cortisol
A1C
Liver Panel
Cholesterol
Kidney Panel
RBC
WBC
CRP
PSA if over 40