Hematology and Oncology Book

http://www.fpnotebook.com/

HematocritAka: Hct, Hematocrit Cutoffs for Anemia

Advertisement

  1. Calculation
    1. Hct = Mean Corpuscular Volume x Red Blood Cell Count
  2. Normal Values per age (-2 SD to +2 SD)
    1. Birth: 42 to 64% (mean 51%)
    2. Age <1 month: 31 to 67% (mean 44%)
    3. Age 1-2 months: 28 to 55% (mean 35%)
    4. Age 2-6 months: 28 to 42% (mean 36%)
    5. Age 0.5 - 2 years: 33 to 40% (mean 36%)
    6. Age 2 to 6 years: 34 to 40% (mean 37%)
    7. Age 6-12 years: 35 to 45% (mean 40%)
    8. Female
      1. Age 12-18 years: 36 to 46% (mean 41%)
      2. Age >18 years: 36 to 44% (mean 41%)
    9. Male
      1. Age 12-18 years: 37 to 49% (mean 43%)
      2. Age >18 years: 41 to 50% (mean 47%)
  3. Anemia Cutoffs
    1. Men
      1. Age 12-14 years: <37.3%
      2. Age 15-17 years: <39.7%
      3. Age >17 years: <38% (WHO) or <39.9% (CDC)
    2. Women (Non-pregnant, non-lactating)
      1. Age 12-14 years: <35.7%
      2. Age 15-17 years: <35.9%
      3. Age >17 years <35% (WHO) or <35.7% (CDC)
    3. Women in Pregnancy (CDC Guidelines <5th percentile)
      1. First Trimester: <33.0%
      2. Second Trimester: <32.0%
      3. Third Trimester: <33.0%
    4. Children (CDC Guidelines <5th percentile)
      1. Age 1-2 years: <32.9%
      2. Age 2-5 years: <33.0%
      3. Age 5-8 years: <34.5%
      4. Age 8-11 years: <35.4%
  4. Increased Hematocrit
    1. Erythrocytosis
      1. Dehydration
    2. Profound diuresis
    3. Hemoconcentration
      1. Burn Injury
      2. Trauma
      3. Shock
    4. Polycythemia Vera
    5. High Altitude
  5. Decreased Hematocrit
    1. See Anemia
    2. Plasma Volume expansion with constant RBC mass
      1. Pregnancy
    3. Recovery stage after Acute Hemorrhage
      1. Hematocrit lags blood loss (not reliable indicator)
  6. References
    1. Behrman (2000) Nelson Pediatrics, Saunders, p. 1462
    2. Johnson (1993) Harriet Lane Handbook, Mosby, p. 231
    3. (1998) MMWR Morb Mortal Wkly Rep 47:1
      1. http://www.cdc.gov/mmwr/pdf/rr/rr4703.pdf

Hematocrit procedure (C0018935)

Definition (MSH)The volume of packed RED BLOOD CELLS in a blood specimen. The volume is measured by centrifugation in a tube with graduated markings, or with automated blood cell counters. It is an indicator of erythrocyte status in disease. For example, ANEMIA shows a low value; POLYCYTHEMIA, a high value.
Definition (NCI)The percentage of a whole blood specimen that is composed of red blood cells (erythrocytes).
Definition (NCI)A measure of the volume of red blood cells expressed as a percentage of the total blood volume. Normal in males is 43-49%, in females 37-43%.
ConceptsLaboratory Procedure (T059)
EnglishHaematocrit, Haematocrit determination, HCT, Hematocrit, Hematocrit determination, Hematocrit procedure, Hematocrits, Packed cell volume, Packed cell volume measurement, Packed Erythrocyte Volume, Packed Erythrocyte Volumes, Packed Red Cell Volume
Spanishdeterminación de hematócrito, determinación de HTO, determinacion de hematocrito, determinacion de HTO, medición del hematócrito, medicion del hematocrito
CreditsDerived from the NIH UMLS (Unified Medical Language System)



Navigation Tree