A thick blood smear is a drop of blood on a glass slide. Thick blood smears are most useful for detecting the presence of parasites, because they examine a larger sample of blood. (Often there are few parasites in the blood at the time the test is done.)
Simply so, what happens to a blood smear if it is too thick?
Insufficiently dried smears (and/or smears that are too thick) can detach from the slides during staining. The risk is increased in smears made with anticoagulated blood. At room temperature, drying can take several hours; 30 minutes is the minimum; in the latter case, handle the smear very delicately during staining.
Furthermore, what is the difference between thick and thin blood smear? A thick blood smear is a drop of blood on a glass slide. (Often there are few parasites in the blood at the time the test is done.) A thin blood smear is a drop of blood that is spread across a large area of the slide. Thin blood smears helps doctors discover what species of malaria is causing the infection.
Consequently, why is a thick blood smear considered to have a higher sensitivity than a thin blood smear?
Thick blood smears are more sensitive in detecting malaria parasites because the blood is more concentrated allowing for a greater volume of blood to be examined; however, thick smears are more difficult to read. Thin smears aid in parasite species identification and quantification.
Why do you avoid the thick area of the smear?
Body and base of the smear These areas are usually too thick to evaluate cells under higher power. The thick area of a smear dries too slowly for leukocytes to spread out.
What is a good blood smear?
Note – blood is being dragged behind the spreader slide, not in front of the slide. An optimal smear is ¾ the length of the slide and has a feathered edge. Leave the slide to air dry and make more smears if required.Is thick or thin blood better?
For the heart and circulatory system, though, thinner, more watery blood might be better. Some tantalizing threads of evidence suggest that people with thicker (or more viscous) blood have higher chances of developing heart disease or having a heart attack or stroke.What are the characteristics of a good blood smear?
The perfect blood smear has a feathered edge that is nearly square, has a rainbow sheen when reflecting the light and is exactly one cell thick in the feathered edge when viewed microscopically. Proper preparation of the blood smear is critical for obtaining accurate results on the differential.How does alcohol fix a blood smear?
Blood smears are fixed by dipping in absolute methanol or ethanol for 30 seconds.Why is blood smear stained?
After fixation, the slide is stained to distinguish the cells from each other. These stains allow for the detection of white blood cell, red blood cell, and platelet abnormalities. Hematopathologists often use other specialized stains to aid in the differential diagnosis of blood disorders.What causes thick blood in the body?
Thick blood is caused by heavy proteins, or by too much blood in the circulation. Too many red cells, white cells, and platelets will result in blood thickening. Another cause is an imbalance in the blood clotting system. Not all blood clots are caused by thick blood.How do you stain a blood smear?
The dried smear is then fixed with methanol or ethyl alcohol and stained. The smear is covered with stain for approximately ten minutes, then diluted with water and allowed an additional ten minutes for the cells to properly stain. Following the stain application, the slide is rinsed under running water.What is the best angle for spreading a blood smear?
Place the spreading end of the spreader slide at a 30–40 degree angle on the slide in front of the blood droplet. The entire short edge of the spreader slide should be in complete even contact with the lower slide. Using your other hand, pin the lower slide to the countertop to prevent it moving.Can you have malaria and still test negative?
If your results were negative, but you still have malaria symptoms, you may need retesting. The number of malaria parasites can vary at times. So your provider may order blood smears every 12-24 hours over a period of two to three days. When treated early, most cases of malaria can be cured.Why is it necessary to prepare a thin film smear?
Thin blood films have a low sensitivity for detection of malaria parasites. Therefore they are used in conjunction with thick blood films, in order to identify the malaria species that was detected by microscopic examination of the thick blood film. All blood samples are potentially infectious.Why do we heat fix a smear?
Before bacteria can be stained, a smear of bacteria must be made on a slide and heat fixed. Heat fixing denatures bacterial enzymes, preventing them from digesting cell parts, which causes the cell to break, a process called autolysis. The heat also enhances the adherence of bacterial cells to the slide.What is Giemsa stain used for?
It differentially stains human and bacterial cells purple and pink respectively. It can be used for histopathological diagnosis of malaria and some other spirochete and protozoan blood parasites. Giemsa stain is a classic blood film stain for peripheral blood smears and bone marrow specimens.How do you prepare a thick and thin blood smear?
Making thick and thin blood smears Thin film (a): Bring a clean spreader slide, held at a 45° angle, toward the drop of blood on the specimen slide. 3. Thin film (b): Wait until the blood spreads along the entire width of the spreader slide.What is the best treatment of malaria?
The most common antimalarial drugs include:- Artemisinin-based combination therapies (ACTs). ACTs are, in many cases, the first line treatment for malaria. There are several different types of ACTs.
- Chloroquine phosphate. Chloroquine is the preferred treatment for any parasite that is sensitive to the drug.
