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Red blood cell indices
Red blood cell indices
Purpose	information about the hemoglobin content and size of red blood cells

Red blood cell indices are blood tests that provide information about the hemoglobin content and size of red blood cells. Abnormal values indicate the presence of anemia and which type of anemia it is.^[1]

Mean corpuscular volume

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]}

${\textit {MCV}}={\frac {\textit {Hct}}{[{\textit {RBC}}]}}$
Normal range: 80–100 fL (femtoliter)

Mean corpuscular hemoglobin

Mean corpuscular hemoglobin (MCH) is the average amount of hemoglobin (Hb) per red blood cell and is calculated by dividing the hemoglobin by the red blood cell count. ^{[citation needed]}

$MCH={\frac {Hb}{RBC}}$
Normal range: 27-31 pg/cell

Mean corpuscular hemoglobin concentration

Mean corpuscular hemoglobin concentration (MCHC) is the average concentration of hemoglobin per unit volume of red blood cells and is calculated by dividing the hemoglobin by the hematocrit. ^{[citation needed]}

$MCHC={\frac {Hb}{Hct}}$
Normal range: 32-36 g/dL

Red blood cell distribution width

Red blood cell distribution width (RDW or RDW-CV or RCDW and RDW-SD) is a measure of the range of variation of red blood cell (RBC) volume, yielding clues about morphology.^{[citation needed]}

Erythropoietic precursor indices

The reticulocyte production index (RPI) or corrected reticulocyte count (CRC) represents the true significance of the absolute reticulocyte count to provide some reflection of erythropoietic demand and supply. The immature reticulocyte fraction (IRF) goes a step further to cast more light on the same question.^{[citation needed]}

Worked example

Measure	Units	Conventional units	Conversion
Hct	40%
Hb	100 grams/liter	10 grams/deciliter	(deci- is 10⁻¹)
RBC	5E+12 cells/liter	5E+6 cells/μL	(micro is 10⁻⁶)
MCV = (Hct/100) / RBC	8E-14 liters/cell	80 femtoliters/cell	(femto- is 10⁻¹⁵)
MCH = Hb / RBC	2E-11 grams/cell	20 picograms/cell	(pico- is 10⁻¹²)
MCHC = Hb / (Hct/100)	250 grams/liter	25 grams/deciliter	(deci is 10⁻¹)