The Microscope
CytoData (CC0), Yarıkan et al., KU-Optofil (CC BY 4.0), Sidhom APL/AML (CC0), Andrea Acevedo et al. (CC BY 4.0), Kevin Ivan Barrera Llanga et al., BCN/NeuNN (CC BY 4.0), and Bodzas and Kodytek (CC0). Images are cropped or resized, converted to WebP and stripped of embedded metadata for display.
Special serologic reagents
Tube endpoint by Bobjgalindo and gel-card endpoint by SpicyMilkBoy, both CC BY-SA 4.0. Cropped, resized, and arranged by LatticeMLS under the same license.
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Benign leukocyte disorders
Images from Barrera Llanga et al. and Yarıkan et al., both CC BY 4.0. Cropped and arranged.
Hereditary leukocyte anomalies
Pelger-Huët by DaFerRod (CC BY-SA 4.0); Chédiak-Higashi by Tanabe et al., Creative Commons Attribution License; Alder-Reilly by Ashwini, Gayathri, and Mannem (CC BY 4.0); May-Hegglin by Paulo Henrique Orlandi Mourao (CC BY-SA 3.0). Cropped, resized, and arranged by LatticeMLS under CC BY-SA 4.0. Cell morphology was not retouched.
Lymphoid neoplasia
Panels A, D, and E from Bodzas and Kodytek (CC0); B and C from Sidhom et al. (CC0); F from Yarıkan et al. (CC BY 4.0).
Myeloid neoplasia
Panels A, D, and E from Bodzas and Kodytek (CC0); B and C from Sidhom et al. (CC0); F from Yarıkan et al. (CC BY 4.0).
Quantitative platelet disorders
Platelet clumping by Prof. Erhabor Osaro, satellitism by Animalculist, and giant platelets by Dr Graham Beards, all CC BY-SA 4.0. The first two were cropped, and arrows were added to the first.
Serologic endpoint patterns
RPR card controls by Ajay Kumar Chaurasiya and latex slide agglutination by Stefan Walkowski, both CC BY-SA 4.0. Hemagglutination assay wells by CDC and Ed Kennedy, 1979, from the CDC Public Health Image Library, PHIL 26438, public domain. The RPR card's control row, the latex slide's six wells, and plate wells C1, C2, D1, and D2 were cropped, resized, and arranged into one figure, shared under CC BY-SA 4.0. Reaction fields were not retouched.
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ANA patterns
Al-Mughales JA; edits by Mikael Häggström, CC BY 4.0. Four fields were cropped, resized, and labeled. Fluorescence color and cell structures were not altered.
Basic laboratory equipment
Meniscus and graduated pipette by Deluxecheese (CC BY-SA 4.0); adjustable pipettes by Squidonius (public domain). Crops, labels, sight lines, and warning bands were added.
Preanalytic, analytic, and postanalytic quality
Normal and hemolyzed specimens by Vioximiko, icteric specimens by BQUB15-Mbaste, and lipemic specimen by Abdullah Sarhan, all CC BY-SA 4.0. Cropped and labeled.
Enteric bacteriology
MacConkey by Medimicro (public domain); XLD by Nathan Reading (CC BY 2.0); Hektoen by Mediocreclementine (CC0); TCBS by Chainwit (CC BY-SA 4.0). All were cropped.
Respiratory bacteriology
Ideal sputum smear and non-ideal sputum smear by Ajay Kumar Chaurasiya, CC BY-SA 4.0.
Mycobacteriology
Carbol-fuchsin smear by Ajay Kumar Chaurasiya and corded MTBC by Ajay Kumar Chaurasiya, both CC0; auramine images by CDC and Wilbur D. Jones, PHIL 18079 and CDC and Ronald K. Smithwick, PHIL 14766, public domain.
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Mycology laboratory methods
CDC and Dr. Lucille K. Georg, PHIL 22046, 28149, 28451, and 26619, and CDC and Dr. Libero Ajello, PHIL 25896, all public domain; Paracoccidioides by R. Summerbell and J. Scott (CC0). Cropped and resized. Organisms were not retouched.
Pneumocystis
Silver-stained lung tissue by CDC/Lois Norman, MS, 1968, from the CDC Public Health Image Library, PHIL 21112, public domain. CDC asks that reuse credit CDC and the photographer and identify the CDC website as the free source. The full field was resized from 3045 × 2005 to 1400 × 922 pixels. Organisms were not retouched.
Intestinal parasitology
Public-domain CDC DPDx images from amebiasis, intestinal amebae, trichuriasis, ascariasis, hookworm, taeniasis, and schistosomiasis. Cropped and resized. Organisms were not retouched.
Blood and tissue parasitology
CDC DPDx malaria and babesiosis images (public domain); Babesia smear by Mikael Häggström, MD (CC0). Cropped. The guided step's pigment question shows three of these panels without their titles. Its practice field is by CDC/Dr. Greene, PHIL 4885 (public domain), cropped from the original photograph.
Fecal analysis
Public-domain images from CDC DPDx and the CDC Division of Parasitic Diseases: Giardia, Entamoeba, Cryptosporidium, Cyclospora, Trichuris, Ascaris, and hookworm. Cropped and resized.
Synovial and serous fluid analysis
FitzGerald et al., Figure 2, CC BY 4.0. The lesson figure was resized, and the row key and column labels were added outside the source figure. The guided-step question uses a resized crop of the lower locating view, with its field, slow-axis and scale marks.
RBC inclusions
Howell-Jolly body by El*Falaf and Pappenheimer bodies with Perls Prussian blue by Paulo Henrique Orlandi Mourao, both CC BY-SA 4.0; basophilic stippling by Mikael Häggström, MD (CC0); Heinz bodies from Dewi et al., Figure 1D (CC BY 4.0), with its arrows. Each photograph was cropped and resized so normal red cells appear the same size, and labels were added outside the photographs. Shared under CC BY-SA 4.0. Cells were not retouched.
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RBC morphology guide
Photographs © 2022 Marchi et al., Figure 1, Red Blood Cell Morphologic Abnormalities in Patients Hospitalized for COVID-19, CC BY 4.0. Cropped and arranged by LatticeMLS, with specimen colors unchanged. The crops are shown at different scales. The source patients had coronavirus disease 2019 (COVID-19). These shapes are not specific to that disease.
Urine cast guides: brightfield and phase contrast
Photographs by Bert Grijsen, Microscopic Urine Examination, 4th edition (2026), pp 36-48, CC BY-SA 4.0. Cropped and arranged by LatticeMLS. Specimen colors unchanged. The photo crops retain this license. The atlas page and position of each photograph:
Scroll sideways to see all columns
| Cast | Phase contrast | Brightfield |
|---|---|---|
| Hyaline | 36, upper right | 36, upper left |
| Red cell | 40, lower right | 39, upper left |
| White cell | 43, upper right | 43, lower left |
| Tubular epithelial | 44, upper right | None |
| Epithelial / white cell | None | 45, upper left, rotated 90 degrees |
| Granular | 37, lower right | 37, lower left |
| Fatty | 48, upper right | 48, upper left |
| Waxy | 46, lower right | 47, middle left |
Urine microscopy
Chu-Su et al., Poloni and Rotta, Rosenbloom et al., Pierna et al., and the MODUS dataset, all CC BY 4.0. Mucus, fiber and starch photographs were supplied by Berberian Labs LLC. The lesson presents nineteen plates cut from the original photographs: cells (1 to 8), casts and mimics (9 to 14), crystals (15 to 17) and artifacts (18 and 19). Publication titles, panel letters, labels, scale marks and outer frames were cropped out. Paired unstained and stained views and brightfield and phase-contrast comparisons were retained, with their orientation named in the live captions. The source arrows remain. Crops were arranged and resized without retouching cells or changing specimen colors. Plates use different enlargements and cannot be compared for size. The guided-step questions reuse these photographs without panel names, cropped, resized and arranged in groups of three or four.