Diagnostic Parasitology is the branch of medical science focused on detecting and identifying parasitic infections in humans and animals. It involves examining clinical samples like stool, blood, urine, or tissue for the presence of parasites such as protozoa, helminths, and ectoparasites. Common diagnostic methods include microscopy, concentration techniques, staining, and serological tests. Molecular techniques like PCR are increasingly used for accurate identification. The diagnosis helps in selecting appropriate antiparasitic treatment and preventing complications. Early detection is crucial in controlling the spread of parasitic diseases. Parasites like Plasmodium, Giardia, and Ascaris are frequently identified through this process. Diagnostic parasitology plays a vital role in tropical medicine and public health.