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Self Instructional Manual for Cancer Registrars - SEER - National ...

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Word Element<br />

Meaning<br />

a. hemat(o)logic hemato(o) blood<br />

logic<br />

pertaining to the study of<br />

b. micr(o)scopic micr(o) small<br />

scopic<br />

visual examination<br />

c. ven(i)puncture yen(i) vein<br />

puncture<br />

puncture<br />

d. erythr(o)cytes erythr(o) red<br />

cytes<br />

cells<br />

e. leuk(o)cytes leuk(o) white<br />

cytes<br />

cells<br />

f. thromb(o)cytes thromb(o) clot<br />

cytes<br />

cells<br />

Be<strong>for</strong>e you can begin to abstract from the hematology reports, you must be aware of the terms<br />

you will encounter and of their significance. Following are definitions of terms which you will<br />

encounter frequently.<br />

Red Blood Cells<br />

There is only one type of mature erythrocyte (red blood cell), but there are several types of<br />

immature erythrocytes. One common type is called a reticulocyte.<br />

Hemoglobin is a blood protein found in red blood cells; it transports oxygen to the tissues of the<br />

body and returns carbon dioxide to the lungs.<br />

Hematocrit measures the volume of erythrocytes.<br />

of whole blood.<br />

It is expressed as a percentage of the volume<br />

White Blood Cells<br />

Leukocytes (white blood cells) are of two main types--granulocytes or granular leukocytes<br />

(containing granules in their cytoplasm) and agranular leukocytes (lacking granules in their<br />

cytoplasm).<br />

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