Red blood cell indices are

blood test A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle, or via fingerprick. Multiple tests for specific blood components, such as a glucose test or a cholester ...

s that provide information about the

hemoglobin Hemoglobin (haemoglobin BrE) (from the Greek word αἷμα, ''haîma'' 'blood' + Latin ''globus'' 'ball, sphere' + ''-in'') (), abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein present in red blood cells (erythrocyte ...

content and size of

red blood cells Red blood cells (RBCs), also referred to as red cells, red blood corpuscles (in humans or other animals not having nucleus in red blood cells), haematids, erythroid cells or erythrocytes (from Greek language, Greek ''erythros'' for "red" and ''k ...

. Abnormal values indicate the presence of

anemia Anemia or anaemia (British English) is a blood disorder in which the blood has a reduced ability to carry oxygen due to a lower than normal number of red blood cells, or a reduction in the amount of hemoglobin. When anemia comes on slowly, th ...

and which type of anemia it is.MedlinePlus Medical Encyclopedia: R BC indices
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Mean corpuscular volume

Mean corpuscular volume (MCV) is the average volume of a red blood cell and is calculated by dividing the

hematocrit The hematocrit () (Ht or HCT), also known by several other names, is the volume percentage (vol%) of red blood cells (RBCs) in blood, measured as part of a blood test. The measurement depends on the number and size of red blood cells. It is norm ...

(Hct) by the concentration of red blood cell count. *

\textit = \frac

* Normal range: 80–100 fL (femtoliter)

Mean corpuscular hemoglobin

Mean corpuscular hemoglobin (MCH) is the average amount of

(Hb) per red blood cell and is calculated by dividing the hemoglobin by the red blood cell count. *

MCH = \frac

* 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. *

MCHC = \frac

* 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.

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.

Worked example

References

{{Myeloid blood tests Blood tests