Definition of haematocrit in English:


(US hematocrit)


  • 1The ratio of the volume of red blood cells to the total volume of blood.

    • ‘Complete blood cell data showed a hematocrit of 31.9% and a mean corpuscular volume of 91.3 fL.’
    • ‘His hemoglobin was 13, his hematocrit was 37.5, and his red blood cell count was 3.79.’
    • ‘This fluid is then centrifuged to leave a solution of red blood cells with a haematocrit of 0.5-0.6.’
    • ‘The ratio of total body to venous hematocrit was calculated for all patients.’
    • ‘Her current white blood cell count, hemoglobin, hematocrit, and red blood cell indices are all normal.’
    1. 1.1 An instrument for measuring the ratio of the volume of red blood cells to the total volume of blood, typically by centrifugation.
      • ‘Last spring they warned about abnormal test scores that recorded high readings of hematocrit, a measure of the volume of red blood cells.’
      • ‘Because severe anemia, defined as a hematocrit less than 0.15, we determined intraoperative estimated blood loss and obtained serial measurements of hematocrit.’
      • ‘Healthy children without a history of snoring who presented to the pediatrics clinic for well child visits and who had blood drawn for routine measurement of hematocrit were also recruited as control subjects.’
      • ‘Your hematocrit result has to be above a thirty-eight and I was just below that.’
      • ‘But because the haematocrit measure is not specific - it can only detect possible abuse - they do not use it.’


Late 19th century: from haemato- ‘of blood’ + Greek kritēs ‘judge’.