Does it make sense to have my hormones tested if I feel listless and fatigued?

If you feel listless and tired, hormone testing can be worthwhile, but it should be targeted: the aim is to identify a specific hormonal cause, not simply to 'check your hormones'. Which test is useful depends strongly on your symptoms, your age, and your medical history. The best-supported test for listlessness is measuring TSH and free T4, the thyroid hormones. An underactive thyroid (hypothyroidism) is a well-known cause of fatigue, affecting approximately 1 in 300 people, more often women and older adults. Because listlessness as a complaint on its own is not enough to establish the diagnosis, blood testing is genuinely necessary here. This is the hormonal test with the strongest diagnostic evidence base for fatigue complaints. A second possible cause is adrenocortical insufficiency: insufficient production of cortisol by the adrenal glands. An early-morning measurement of cortisol, ACTH, and DHEAS can detect this. Fatigue is present in 50 to 95 percent of patients with this condition. Nevertheless, adrenocortical insufficiency is rare (fewer than 279 per million people), unless someone has taken high doses of cortisone medications over a prolonged period. In that case, testing is indeed relevant. Hypopituitarism, in which the pituitary gland produces too few hormones, is also a rare but serious cause of persistent fatigue. Diagnosis requires more extensive hormone measurements and sometimes an MRI scan. It occurs in 300 to 455 cases per million people. This is therefore not a routine check, but something to consider if other symptoms are also present, such as low blood pressure, cold sensitivity, or fertility problems. For athletes with persistent fatigue and a decline in performance, hormone measurement is also being studied as a tool for detecting overtraining syndrome. However, no validated standard test yet exists for this; the diagnosis is only made once other causes have been ruled out. Hormone measurements alone are insufficient here. An important caveat: in dialysis patients it was found that standard laboratory values, including hormone values, were not at all able to predict the degree of fatigue. This is a reminder that hormone testing does not always provide the explanation, particularly when the cause of fatigue lies elsewhere, such as in depression or chronic illness.