What blood test work to be checked in case of complete loss of bowel motility other than tsh, i'm dependent on laxitives.

Constipation: Check diet fluids 2-3 liters a days- more with exercise, hot weather, fiber ( beans,oats, brown rice, kale, strawberries), bowel hygiene: set time, relaxation, daily exercise. Probiotics/coffee may help. Other factors: diabetes/neuropathy, menopause, stress/anxiety, atherosclerosis/ ischemia to bowel ( rare) , parathyroids,weak pelvic muscles,low magnesium, masses of bowel, ovary, neurologic