A blood smear is a blood test that gives information about the number and shape of blood cells.
Alternative NamesPeripheral smear
How the test is performedBlood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.
Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.
The blood sample is sent to a lab, where the health care professional looks at it under a microscope. Or, the blood may be examined by an automated machine. The smear shows the number and kinds of white blood cells (differential), abnormally shaped blood cells, and gives a rough estimate of white blood cell and platelet counts.
How to prepare for the testNo special preparation is necessary.
How the test will feelWhen the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedThis test may be performed as part of a general health exam to help diagnose many illnesses. Or, your doctor may order this test if you have signs of a blood disorder.
Other conditions under which the test may be performed:
Red blood cells normally are the same in size and color and have a lighter-colored area in the center. The blood smear is considered normal if there is:
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results meanAbnormal results mean there is an abnormality in the size, shape, color, or coating of the red blood cells.
Some abnormalities may be graded on a 4-point scale:
The presence of target cells may be due to:
The presence of sphere-shaped cells (spherocytes) may be due to:
The presence of elliptocytes may be a sign of hereditary elliptocytosisor hereditary ovalocytosis.
The presence of fragmented cells (schistocytes) may be due to:
The presence of a type of immature red blood cell called a normoblast may be due to:
The presence of burr cells (echinocytes) may indicate:
The presence of spur cells (acanthocytes) may indicate:
The presence of teardrop-shaped cells may indicate:
The presence of Howell-Jolly bodies may indicate:
The presence of Heinz bodies may indicate:
The presence of slightly immature red blood cells (reticulocytes) may indicate:
The presence of basophilic stippling may indicate:
The presence of sickle cells may indicate sickle cell anemia.
What the risks areVeins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
The accuracy of this test depends, in part, on the experience of the person looking at the sample. Experienced cell examiners can get a lot of information from the blood smear.
ReferencesNewland J. The peripheral blood smear. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 161.
Reviewed ByReview Date: 02/09/2010
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
A blood smear is a sample of blood that is spread thinly on a glass slide, stained, and examined under a microscope. It is used to evaluate the number, morphology, and size of different types of blood cells such as red blood cells, white blood cells, and platelets. This test helps in diagnosing various blood disorders and infections.
Thin smears of blood are needed to investigate hematological problems or disorders of the blood. It is also used to identify the parasite within the blood. Thick films enables the microscopist to screen the blood of a larger volume. They are more sensitive than the thin film.
NSS (normal saline solution) is used instead of water in preparing a fecal smear to prevent lysis (rupturing) of red blood cells in the sample. Using water can cause hemolysis, which may interfere with the accurate interpretation of the fecal sample. Normal saline is isotonic and helps maintain the integrity of the red blood cells in the smear.
Smudge cells are caused by the mechanical disruption of fragile cells, such as lymphocytes, during the slide preparation process for blood smear examination. This can occur due to rough handling, poor staining techniques, or improper smear creation. Smudge cells are often seen in samples with high white blood cell counts and do not represent pathological changes in the cells themselves.
Due to the limited field of vision of microscopes, it is comparatively easier to count the number of white blood cells in a stained blood smear under low power than under high magnification. Although the individual cells would be smaller and thus more difficult to count, there would be more in view at any given time.
Blood
It's not unusual for women to have a small amount of bleeding with their pap smear. On its own, blood in the pap smear has no clinical significance.
lllpp
The area of a blood smear that is tested is called the peripheral blood smear. It is a sample of blood that is spread thinly on a glass slide for examination under a microscope to evaluate the number, shape, and size of blood cells.
A blood sample is not part of the pap smear, which screens for cervical cancer. Blood tests may be recommended for patients at the office for their annual exams, however.
Neutrophils
Blood on the swab is not unusual during a pap smear and has no clinical significance.
A blood smear is a sample of blood that is spread thinly on a glass slide, stained, and examined under a microscope. It is used to evaluate the number, morphology, and size of different types of blood cells such as red blood cells, white blood cells, and platelets. This test helps in diagnosing various blood disorders and infections.
a frog blood smear reveals that its red blood cells are ovoid in nature as compared to the human RBCs that are spherical in nature. i think that's the main difference that u will find with a frog blood smear
sBoth thick and thin blood smears are taken from the finger tip of earlobe of malaria patient. This smear is kept in water to dissolve and remove the haemoglobin from the slide. The slide is stained and visualised under oil immersion lens to see the malaria parasites directly.
from the body or blood bank. dont get from anywhere else
i just want the answer