Antimicrobial central venous catheters do not reduce infections in pre-term babies.

The studyGilbert R, Brown M, Rainford N et al. Antimicrobial-impregnated central venous catheters for prevention of neonatal bloodstream infection (PREVAIL): an open-label, parallel-group, pragmatic, randomised controlled trial. 2019;3:381-90.

Repeat thyroid function tests for healthy older people are not needed.

The studyRoberts L, McCahon D, Johnson O, Haque MS, Parle J, Hobbs FR. Stability of thyroid function in older adults: the Birmingham Elderly Thyroid Study. Published on 28 August 2018 2018;68:e718-26.