And most importantly: Retaining its accessible and user-friendly style, the aim of this book remains the same: to provide nurses with as much relevant information as possible about the most commonly requested laboratory rests. This is not a book about laboratory technique - its focus is on the clinical significance of test results, and therefore the patient.  The third edition is more comprehensive in terms of the number of tests discussed, incorporates colour to aid the accessibility, and includes more paediatric content.