Giemsa stain, named after German chemist and bacteriologist Gustav Giemsa, is a nucleic acid stain used in cytogenetics and for the histopathological diagnosis of malaria and other parasites.[1]It is specific for the phosphate groups of DNA and attaches itself to regions of DNA where there are high amounts of adenine-thymine bonding. Giemsa stain is used in Giemsa banding, commonly called G-banding, to stain chromosomes and often used to create a karyogram (chromosome map). It can identify chromosomal aberrations such as translocations and rearrangements.It stains the trophozoite Trichomonas vaginalis, which presents with greenish discharge and motile cells on wet prep.Giemsa stain is also a differential stain, such as when it is combined with Wright stain to form Wright-Giemsa stain. It can be used to study the adherence of pathogenic bacteria to human cells. It differentially stains human and bacterial cells purple and pink respectively. It can be used for histopathological diagnosis of the Plasmodium species that cause malaria and some other spirochete and protozoan blood parasites. It is also used to stain Wolbachia cells in host tissue.Giemsa stain is a classic blood film stain for peripheral blood smears and bone marrow specimens. Erythrocytes stain pink, platelets show a light pale pink, lymphocyte cytoplasm stains sky blue, monocyte cytoplasm stains pale blue, and leukocyte nuclear chromatin stains magenta. It is also used to visualize the classic “safety pin” shape in Yersinia pestis.“Owl’s-eye” viral inclusions, associated with Cytomegalovirus infection. Giemsa stain is also used to visualize chromosomes. This is particularly relevant for detection of Cytomegalovirus infection, where the classical finding would be an “owl-eye” viral inclusion.Giemsa stains the fungus Histoplasma, Chlamydia bacteria, and can be used to identify mast cells.Giemsa’s staining solution is a dye mixture used to stain samples for microscopic examination. It’s made up of methylene blue, eosin, and Azure B, and is commonly used in hematology, histology, cytology, and bacteriology.