Assessment indicator | Microscopists (n = 127) | ||
---|---|---|---|
Mean | SD | Accuracy rate (%) | |
Ability in malaria microscopy (n = 4, maximum score = 5) | 0.78 | 0.69 | - |
Preparation and documentation (n = 7, maximum score = 1) | 0.9 | 0.11 | - |
• Preparation of microscope, needle, methanol and first-aid dressings, Giemsa staining solution, slides and object slides | - | - | 98 |
• Check the expiry dates of all solutions | - | - | 74 |
• Write the names of the patient on the slides | - | - | 92 |
• Write the date on each slide | - | - | 63 |
• Select the 5th finger of the left hand to take the peripheral blood sample | - | - | 92 |
• Clean the finger with alcohol swab and allow it to air dry | - | - | 98 |
• Record the results in the CHW register | - | - | 98 |
Slide preparation and observation (n = 21, maximum score = 1) | 0.76 | 0.09 | |
• Take patient’s peripheral blood | - | - | 98 |
• Prepare samples immediately after taking the blood | - | - | 96 |
• Use clean slide | - | - | 100 |
• Put one droplet of blood on the slide | - | - | 79 |
• Using cover glass, spread the blood so as to obtain a thin layer of blood cells | - | - | 97 |
• The angle of the cover glass is 30 degrees | - | - | 72 |
• Dry immediately | - | - | 99 |
• Fix with methanol for 2 to 5 minutes | - | - | 94 |
• Too much drying damages the staining | - | - | 26 |
• Keep the slides fixed with methanol horizontally and add the staining solution | - | - | 82 |
• When numerous samples are used, use staining bottle | - | - | 94 |
• Staining time depends on the concentration of the dyes(usually between 10 and 30 minutes) | - | - | 88 |
• Maximum staining time is 45 minutes and even if you wait longer,the color does not change | - | - | 49 |
• Wash with buffer | - | - | 21 |
• If insoluble pigments are present at the surface of the solutions,take them off carefully | - | - | 38 |
• Adjust the intensity of the staining through washing time with the buffer | - | - | 17 |
• After washing, take off water quickly and dry with cold air | - | - | 100 |
• Observe with microscope | - | - | 100 |
• Nuclei of malaria parasite inside red blood cells will be stained in red | - | - | 81 |
• The cytoplasm of malaria parasite inside red blood cells will be stained in blue | - | - | 94 |
• When malaria parasite is found inside red blood cells, check the type of protozoa | - | - | 97 |
Safe handling and disposal (n =6, maximum score = 1) | 0.92 | 0.15 | |
• Put on a new pair of gloves when starting | - | - | 67 |
• Do not touch patient blood | - | - | 85 |
• Use a sterile lancet to puncture the patient finger | - | - | 100 |
• Discard the needle in sharps bins immediately after usage | - | - | 100 |
• Use a new needle for each patient | - | - | 100 |
• Discard glove wrappers, alcohol swab, desiccant and cassette in non-sharps container | - | - | 95 |
Knowledge on the morphology of infected RBCs (n = 27, maximum score = 1) | |||
Cited in Table 4 | 0.55 | 0.12 | - |