As a GP we often order thyroid function tests but do you ever wonder if it´s worthwhile? This book looks at clinical features that are more likely to give abnormal thyroid function results. A large general practice population in the united Kingdom was analysed for a year to give this data. The hope is to improve the efficiency of your practice and have some evidence behind discussions with patients that frequent request thyroid function tests.Dr Alexander Werhun (MBBCh BSc(Hons) MRCGP MRes)The author has recently completed a General Practice training scheme in Exeter, which ran alongside an Academic Clinical Fellowship based at Exeter University. The author has worked on diagnostic methods of primary care for the past two years, and plans to continue working in the research field.