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Hematocrit

Aka: Hematocrit, Hct, Hematocrit Cutoffs for Anemia
  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%
    5. Infants (2 S.D. below mean)
      1. Term (cord blood): <42% (mean 51%)
      2. Newborn (1-3 days): <56 (mean 45%)
      3. Age 2 weeks: <53% (mean 41%)
      4. Age 1 month: <44% (mean 33%)
      5. Age 2 months: <35%(mean 28%)
      6. Age 6 months: <36% (mean 31%)
      7. Reference
        1. Shilkofski (2005) Harriet Lane Handbook, 17th ed, Mosby, p. 337
  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 47:1-29
      1. http://www.cdc.gov/mmwr/pdf/rr/rr4703.pdf

Hematocrit procedure (C0018935)

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%.
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.
Concepts Laboratory Procedure (T059)
MSH D006400
SnomedCT 165418001, 142829008, 165417006, 250230009, 142828000, 142830003, 165419009, 28317006, 250231008
CPT 85014
English Hct, Erythrocyte Volume, Packed, Erythrocyte Volumes, Packed, Hematocrit, Hematocrits, Packed Erythrocyte Volume, Packed Erythrocyte Volumes, Packed Red Cell Volume, Packed Red-Cell Volume, Packed Red-Cell Volumes, Red-Cell Volume, Packed, Red-Cell Volumes, Packed, Volume, Packed Erythrocyte, Volume, Packed Red-Cell, Volumes, Packed Erythrocyte, Volumes, Packed Red-Cell, HEMATOCRIT, Hematocrit procedure, HCT, hematocrit, hematocrit (lab test), Haematocrit (observable entity), Packed cell volume (observable entity), Haematocrit (procedure), Haematocrit - PCV - NOS (procedure), PCV, Hematocrit Measurement, Hematocrit - PCV - NOS (procedure), hematocrit level test, Blood count; hematocrit (Hct), BLOOD COUNT; HEMATOCRIT (HCT), Whole Blood Hematocrit Test, Hematocrit determination, Haematocrit, Haematocrit - PCV, Hct - Haematocrit, Hct - Hematocrit, Hematocrit - PCV, Packed cell volume, Haematocrit determination, Hematocrit determination (procedure), Packed cell volume measurement (procedure), Packed cell volume measurement, Haematocrit - PCV - NOS, Hematocrit - PCV - NOS, BLD# HEMATOCRIT
Dutch PCV, packed-cell volume, hematocriet, Erytrocytenconcentraatvolume, Hematocriet
French VGC, Volume de globules concentrés, Hématocrite
German Volumenanteil der Zellen, PCV, Haematokrit, Erythrozythenvolumen, gepacktes, Gepacktes Volumen roter Blutzellen, Hämatokrit
Portuguese Hct, Hematócrito, Volume do Concentrado de Eritrócito, Volume do Concentrado de Hemácia
Spanish Hto, Hematocrit, Haematocrit - PCV - NOS, Packed cell volume, Haematocrit, Hematocrit - PCV - NOS, fuera del microhematocrito por centrifugacion, determinación de HTO, determinación de hematócrito (procedimiento), determinación de hematócrito, hematócrito, SAI (procedimiento), hematócrito, SAI, medición del hematócrito (procedimiento), medición del hematócrito, Hematocrito, Volumen de Celula-Roja Empaquetada, Volumen de Eritrocito Empaquetado, Volumen de Célula-Roja Empaquetada, Hematócrito
Japanese ＰＣＶ, ﾍﾏﾄｸﾘｯﾄ, PCV, ヘマトクリット, 充填赤血球量, 赤血球容積率, 赤血球沈層容積, 赤血球量-充填
Swedish Hematokrit
Czech hematokrit, Celkový buněčný objem, Hematokrit
Finnish Hematokriitti
Italian Volume degli eritrociti ammassati, Volume dei globuli ammassati, Ematocrito
Russian GEMATOKRIT, ERITROTSITOV OB"EM UPLOTNENNYI, GEMATOKRITNOE CHISLO, ГЕМАТОКРИТ, ГЕМАТОКРИТНОЕ ЧИСЛО, ЭРИТРОЦИТОВ ОБЪЕМ УПЛОТНЕННЫЙ
Polish Hematokryt
Hungarian Hematokrit, Sejtmassza térfogat, PCV, Haematocrit
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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