The seventh edition of this concise, highly practical guide to the interpretation of normal and abnormal laboratory results is fully revised and expanded, with updates on established and familiar tests, as well as interpretations on recent developments.

With increasing responsibility being placed on primary care, the book includes guidelines on specific clinical conditions such as heart failure, management of female infertility, specific lipid monitoring in diabetes and guidance for monitoring renal failure. It also includes suggestions for appropriate laboratory tests in certain clinical situations, for example: dementia screen, screening tests when a patient presents with a neuropathy, and appropriate tests for patients presenting with hypertension, chronic fatigue syndrome, erectile dysfunction and gynaecomastia. Completely up-to-date, A Guide to Laboratory Investigations, Seventh Edition remains an essential handbook for all primary care professionals professionals and a valuable reference for medical students and hospital physicians in training and in practice.

Dr Michael F McGhee qualified at St Mary's Hospital London in 1975. He joined the RAF in 1972 and gained his MRCGP in 1979 and became a trainer with the RAF and The Royal Army Medical College Millbank, London with the late Colonel Tommy Bouchier-Hayes. Together they organised education for military GPs in training and often engaged the help of one of the Fathers of General Practice the late John Fry. Mike, after a short service commission, left the RAF to enter General Practice in Castle Donington in 1981 where he became a trainer with the Nottingham Vocational Training Scheme and an NHS appraiser. He has co-authored A Guide to General Practice, Blackwell Scientific Publications, A Guide to Infectious Diseases, Radcliffe Medical Press and Gynaecological Symptoms in Primary Care, Blackwell Science Ltd. He retired from the NHS in 2014. During his time in General Practice Mike also practised as an Aero-Medical Examiner for the UK Civil Aviation Authority. He currently works part-time at East Midlands Airport examining and certifying the fitness of Flight Crew and Air Traffic Controllers.

Dr Caroline Anne Saxelby qualified at the University of Leeds Medical School, having previously completed a BSc in medical microbiology. She is a part-time GP in a suburban practice in Derby with a large elderly population. Her special interests are contraception and end of life care and she currently leads on both of these areas in the practice. Since qualifying as a GP in 2008, she completed her Vocational Training in Nottingham. She has also worked as a Contraception and Sexual Health Staff doctor and was the Macmillan end of life lead for the Southern Derbyshire CCG for a number of years until 2018. She is a GP Trainer having completed her PGCME at De Montfort University, Leicester in 2010.

Dr Niall McKay qualified in Glasgow in 1989. He is an experienced GP in Derby, having worked in Primary Care in Scotland, England and Australia. He is a GP trainer and Appraiser, and more recently PCN Clinical Director.