White blood cell count (WBC)

White blood cell count refers to counting the number of white blood cells contained in a unit volume of blood. Formerly known as white blood cells, it is an important part of the body's defense system. Reduced white blood cell count, seen in typhoid and paratyphoid fever, malaria, aplastic anemia, acute agranulocytosis, hypersplenism, X-ray, radionuclide exposure, use of certain anticancer drugs. Basic Information Specialist classification: growth and development examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Analysis results: Below normal: Disease factors such as typhoid and paratyphoid can be reduced. Normal value: Adult: 3.5×10^9-9.5×10^9L/mm3 Newborn: 15.0×10^9-20.0×10^9L/mm3 Baby: 15.0×10^9-20.0×10^9L/mm3 Children: -L/mm3 Above normal: An infection may occur above normal. negative: Positive: Tips: Do not eat too greasy, high-protein foods the day before the blood draw, avoid heavy drinking. Normal value Adult: (3.5~9.5)×10^9/L (3500～9500/mm3) Newborn: (15.0 ~ 20.0) × 10 ^ 9 / L (15000 ~ 20000 / mm3) Baby: (15.0 ~ 20.0) × 10 ^ 9 / L Children: (5.0 ~ 12.0) × 10 ^ 9 / L Clinical significance The level of white blood cell count may indicate a disease involving the white blood cell system. Increased white blood cell count, seen in acute infection, uremia, severe burns, acute bleeding, tissue damage, major surgery, leukemia, etc. Reduced white blood cell count, seen in typhoid and paratyphoid fever, malaria, aplastic anemia, acute agranulocytosis, hypersplenism, X-ray, radionuclide exposure, use of certain anticancer drugs. High results may be diseases: suppurative tenosynovitis, Colorado fever, pelvic inflammatory mass, suppurative skull osteomyelitis, purulent paronychia, respiratory syncytial virus infection, pediatric allergic purpura matters needing attention First, the precautions before blood draw 1. After 8 pm on the day before the physical examination, fasting should be done to avoid affecting the detection of indicators such as blood glucose in the second sky. 2, should relax when taking blood, to avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection. 3. If you have a history of fainting, please explain in advance, we will make special arrangements. Second, should pay attention after blood draw 1. After blood is drawn, local compression is required at the pinhole for 3-5 minutes to stop bleeding. Note: Do not rub, so as not to cause subcutaneous hematoma. 2, the pressing time should be sufficient. There is a difference in clotting time for each person, and some people need a little longer to clotting. Therefore, when the surface of the skin appears to be bleeding, the compression is stopped immediately, and the blood may be infiltrated into the skin due to incomplete hemostasis. Therefore, the compression time is longer to completely stop bleeding. If there is a tendency to bleed, the compression time should be extended. 3, after the blood draw symptoms of fainting such as: dizziness, vertigo, fatigue, etc. should immediately lie down, drink a small amount of syrup, and then undergo a physical examination after the symptoms are relieved. 4. If there is localized congestion, use a warm towel after 24 hours to promote absorption. Inspection process 1. Take 1 small test tube and add 0.38 ml of leukocyte dilution. 2. Accurately absorb 20 μl of peripheral blood with a hemoglobin pipette. 3. Wipe off the external blood of the tube tip, insert the straw into the bottom of the tube containing 0.38 ml of the diluted solution, gently blow out the blood, and pipette the supernatant for 3 times. Note that the dilution solution cannot be mixed every time. Shake the tube and mix. 4. Fill the liquid, wipe the counting pool and cover slip, cover the slide on the counting pool, then quickly absorb the mixed suspension into the counting pool with a micropipette, and let it stand for 2~3 minutes. 5. Count the total number of white blood cells in the four large squares of the four corners with a low power microscope. For white blood cells of the pressure line, the principle of counting the number of counts and counting the number of left and right should be adopted to ensure the consistency and accuracy of the counting results in the counting area. Not suitable for the crowd Generally no taboos. Adverse reactions and risks 1. Infection: Pay attention to aseptic operation when collecting blood, avoid contamination of water and other parts at the blood collection site to avoid local infection. 2, bleeding: after the blood is given a full compression time, especially coagulopathy, bleeding tendency, to avoid local subcutaneous oozing, bruising and swelling.

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