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This study found that in lactating Holstein cows, hair from the tail switch, which grows faster and is more sensitive to cortisol changes, is ideal for measuring hair cortisol levels.

In this case study, researchers identified a Leydig cell tumor in a 56-year-old postmenopausal woman with virilization symptoms by using ovarian vein sampling, as imaging was nonrevealing, and confirmed the tumor's location using testosterone ratios, which supported previous findings.

Doctors used a special blood sampling technique to diagnose a woman's rare ovarian tumor that was producing male hormones.

Detecting steroid esters in cattle hair is inconsistent and influenced by sampling factors.

This study suggests hair diameter may indicate protein status in children if the sampling location on the head is controlled, noting inconsistencies in past research.