2nd edition. The purpose of this document is to present updated standardized protocols that P. falciparum-endemic countries can use to determine the prevalence of parasites with pfhrp2/3 gene deletions causing negative HRP2 RDT results among symptomatic falciparum patients. The findings should be used to guide RDT selection; more specifically when to shift away from exclusive use of HRP2 to detect P. falciparum infections.