Place clean glass slide on a flat surface. Add one small drop of blood to one end.Take another clean slide, and holding at an angle of about 45 deg, touch the blood with one end of the slide so the blood runs along the edge of the slide by capillary action. … Make 2 smears, allow to air dry, and label clearly.
What are the preparation of blood smear?
A thin smear being prepared. Place a small drop of blood on the pre-cleaned, labeled slide, near its frosted end. Bring another slide at a 30-45° angle up to the drop, allowing the drop to spread along the contact line of the 2 slides. Quickly push the upper (spreader) slide toward the unfrosted end of the lower slide.
What are the types of blood smear techniques?
The most common technique of blood smear preparation is called the “wedge or push” technique. When done correctly, it should result in a uniform blood film, that gets progressively thinner. A small drop of blood is placed on the midline at the end of a glass slide.
What are the three methods of preparing a blood smear?
Four different types of smear preparation methods (conventional method, blood film method, drop and rest method, and water-wash method) were carried out according to the standard reference as described below.Why is blood smear test done?
A blood smear is a blood test used to look for abnormalities in blood cells. The three main blood cells that the test focuses on are: red cells, which carry oxygen throughout your body. white cells, which help your body fight infections and other inflammatory diseases.
Where should blood be taken from to perform a smear?
What happens during a blood smear? A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.
What are the important precautions in preparing a blood smear?
- Angle should be maintained at 45°.
- Blood drop should be of proper size.
- Spreader’s edges should be smooth and it should be smaller than the slide on which smear is being made.
- Pressure applied should be proper. …
- Drop should be pulled with spreader not pushed with it.
What equipment is needed for a blood smear?
Equipment required for performing blood smears: spreader slide – use a specific spreader slide with bevelled edges, or a second clean microscope slide. capillary (microhaematocrit) tubes. pencil to label the slides. blood collected in an EDTA tube.How long does it take to get blood smear results?
The blood smear is a quick test. Your doctor may draw blood from your arm or by pricking your finger. You usually get the results in one to two days.
How do you adjust the thickness of a blood smear?Thick smear • Use smaller drop of blood. Decrease the angle of the spreader slide. Increase the speed of the spreader slide. Thin smear • Use a larger drop of blood.
Article first time published onHow do you read a blood smear?
- Red blood cell number. First, make sure you’re in the right part of the smear. …
- Red cell size. …
- Red cell shape. …
- Red cell chromasia. …
- Reticulocytes. …
- Stuff inside red cells. …
- Platelet number. …
- Platelet morphology.
Do you stain a blood smear?
Left smear is unstained, right smear is stained with Wright-Giemsa stain. A blood film—or peripheral blood smear—is a thin layer of blood smeared on a glass microscope slide and then stained in such a way as to allow the various blood cells to be examined microscopically.
What type of slide would you use for a blood smear?
The Ideal Blood Smear One of the most common types of peripheral blood slides is the wedge slide. An ideal slide is neither too thin nor too thick. It should end about two-thirds to three-fourths of the way down the slide.
What is blood smear test called?
A blood smear, also referred to as a peripheral smear for morphology, is an important test for evaluating blood-related problems, such as those in red blood cells, white blood cells, or platelets.
What diseases require a peripheral blood smear and why?
Common clinical indications for peripheral blood film analysis include unexplained cytopenia: anaemia, leucopenia or thrombocytopenia; unexplained leukocytosis, lymphocytosis or monocytosis; unexplained jaundice or haemolysis; features of congenital haemolytic anaemias such as splenomegaly, jaundice or bone pains; …
Can a blood smear detect leukemia?
For the peripheral blood smear (sometimes just called a smear), a drop of blood is smeared across a slide and then looked at under a microscope to see how the cells look. Changes in the numbers and the appearance of the cells often help diagnose leukemia.
What can a blood smear diagnose?
- Anemia.
- Jaundice.
- Sickle cell disease.
- Thrombocytopenia.
- Malaria.
- Sudden kidney failure.
- G6PD deficiency.
- Certain cancers.
What common mistakes that can contribute to a poor blood smear?
Drop of blood too large or too small. Spreader slide pushed across the horizontal slide in a jerky manner. Failure to keep the entire edge of the spreader slide against the horizontal slide while making the smear. Failure in using appropriate angle for the spreader slide.
What are the errors to avoid when making a blood smear?
What are five errors to avoid when making a blood smear? Do not use dirty slides; do not use too large a drop of blood; do not delay in spreading the blood; do not apply too much pressure to the spreader slide; and do not dry the smears in a humid environment which will prolong the drying time.
Why is a good blood smear necessary for accurate counts?
From the clinical standpoint, blood smear examination serves 3 important objectives. First, it serves as a quality control tool in verifying the results generated by the automated analyzers. Second, it allows for identification of abnormal/immature/atypical cells, if present.
Whats the advantage of a blood smear compared to a CBC?
What’s the advantage of a blood smear compared to a CBC? Blood smears focus on RBC, WBC, platelets, and in some cases can help identify blood parasites. Viruses cannot be identified with this technique due to their small size.
What is meant by peripheral blood smear?
Listen to pronunciation. (peh-RIH-feh-rul blud smeer) A procedure in which a sample of blood is viewed under a microscope to count different circulating blood cells (red blood cells, white blood cells, platelets, etc.) and see whether the cells look normal.
What is the difference between thick and thin blood smear?
A thick blood smear is a drop of blood on a glass slide. A thin blood smear is a drop of blood that is spread across a large area of the slide.
What are the causes of too thin or too thick blood smears?
Blood smears that are too thin or too thick present a prob- lem. Extremely thin smears (caused by too small a drop, too slow spreading or too low a spreader angle), may result in red blood cells (RBC) that appear as spherocytes and in – creased white blood cells (WBC), such as monocytes and neutrophils, in the tails.
How do you calculate platelets from a blood smear?
An estimated platelet count can be done quickly with a blood smear evaluated at 100× magnification. At this magnification, the platelet count/µL of blood can be approximated by multiplying the number of platelets seen in one microscope field by 15,000.
What are normal RBC counts?
A normal range in adults is generally considered to be 4.35 to 5.65 million red blood cells per microliter (mcL) of blood for men and 3.92 to 5.13 million red blood cells per mcL of blood for women. In children, the threshold for high red blood cell count varies with age and sex.
How is WBC counted in blood smear?
- Choose a one-cell layer area, no overlapping/crowding of cells and count WBCs present in several fields.
- Estimated # of WBCs per ml blood = (average # of WBCs per field x 1000) x 1/4.
