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Hematocrit can vary from the determining factors of the number of red blood cells. These factors can be from the age and sex of the subject. [clarification needed] [16] The normal hematocrit level is around 40% for adult women and about 45% for adult men. In newborns, it is approximately 55% and drops to around 35% by 2 months of age.
References range may vary with age, sex, race, pregnancy, [10] diet, use of prescribed or herbal drugs and stress. Reference ranges often depend on the analytical method used, for reasons such as inaccuracy, lack of standardisation, lack of certified reference material and differing antibody reactivity. [11]
Mean corpuscular volume (MCV) is the average volume of a red blood cell and is calculated by dividing the hematocrit (Hct) by the concentration of red blood cell count. [citation needed] = [] Normal range: 80–100 fL (femtoliter)
Polycythemia is defined as serum hematocrit (Hct) or hemoglobin (HgB) exceeding normal ranges expected for age and sex, typically Hct >49% in healthy adult men and >48% in women, or HgB >16.5 g/dL in men or >16.0 g/dL in women. [8] The definition is different for neonates and varies by age in children. [9] [10]
Based on a statistical normal distribution, the tested samples' ranges vary with sex and age. [179] On average, adult females have lower hemoglobin, hematocrit, and red blood cell count values than males; the difference lessens, but is still present, after menopause. [180] CBC results for children and newborn babies differ from those of adults.
An operational definition is a decrease in whole-blood hemoglobin concentration of more than 2 standard deviations below the mean of an age- and sex-matched reference range. [ 63 ] It is difficult to directly measure RBC mass, [ 64 ] so the hematocrit (amount of RBCs) or the hemoglobin (Hb) in the blood are often used instead to indirectly ...
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The normal range for MCV is 80–100 fL. If the hematocrit is expressed as a percentage, the red blood cell concentration as millions per microliter, and the MCV in ...
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