The range of supplementary tests available for diagnosing malaria has continued to expand. Despite this, carefully examined thick and thin blood films remain an essential part of the process. This guideline updates the previous 2013 British Society for Haematology Guideline for the Laboratory Diagnosis of Malaria. M ETHODOLOGYThis guideline was compiled according to the British Society for Haematology (BSH) process at https://b-s-h.org.uk/media/ 16732/ bsh-guida nce-devel opmen t-proce ss-dec-5-18.pdf. The Grading of Recommendations Assessment, Development and Evaluation (GRADE) nomenclature was used to evaluate levels of evidence and to assess the strength of recommendations, although there are some challenges with applying these to laboratory diagnostic methods. The GRADE criteria can be found at http://www.grade worki nggro up.org. R EV IEW OF TH E M A N USCR IP TReview of the manuscript was performed by the BSH General Haematology Task Force, the BSH Guidelines Committee and the sounding board of BSH. It was also on the members section of the BSH website for comment.

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