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Normal monocyte count in the blood

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Normal monocyte count in the blood
Last update: 16/03/2021

What is the normal count of monocytes in the blood?

The normal count of monocytes in the blood is age-dependent:

Adults: 130 - 850 /µl (microliter)
Children from 5 to 18 years old: 20 - 825 /µl (microliter)
Children from 2 to 5 years old: 275 - 775 /µl (microliter)
Children from 1 to 2 years old: 300 - 850 /µl (microliter)
Babies from 3 to 12 months old: 300 - 875 /µl (microliter)
Babies from 1 to 3 months old: 350 - 1365 /µl (microliter)
Babies from 15 to 30 days old: 280 - 1400 /µl (microliter)
Newborns up to 15 days old: 520 - 1800 /µl (microliter)

Why normal levels can differ across different labs?

Each laboratory must establish its own normal ranges for the monocytes count in the blood. These ranges depend on the makeup of the local population, the technologies used and the accuracy of the measurement. There may be also slight differences in the normal levels, according to age, gender, race or ethnic origin, geographic region, diet, type of sample and other relevant status.

Your doctor will study the results along with your medical record, screenings, physical condition, symptoms and any other relevant information about your situation.

What is the role of monocytes in the body?

Monocytes are a type of leukocytes or WBCs (White Blood Cells). They prevent infections by killing invading pathogens. They also stimulate and regulate lymphocyte production.

Monocytes present in the blood are between the 2% and 8% of the total WBCs detected in the blood.

Monocytes kill foreign pathogens that may attack the body, act as phagocytes in some chronic inflammatory diseases and play a critical role in tissue development and injury repair.

The presence of monocytes in the blood is brief because they are usually located in the tissues where they act as macrophages, killing pathogens such as viruses, bacteria or fungi.

What is the monocyte count used for?

Monocytes are present in the blood as an intermediate step in their life cycle. Monocytes are produced by the bone marrow and travel through the bloodstream to reach the tissues. When monocytes enter the tissue, they become macrophages responsible for fighting foreign pathogen and digesting them in a process known as phagocytosis.

An increase in monocyte count in the blood is called monocytosis. When there is an infection or an inflammatory process the number of monocytes in the blood is increased. A clinically significant increase of monocytes, for example, accompanies tuberculosis. Monocytosis may also be a sign of:

  • Protozoan infections such as malaria.
  • Rickettsial infections such as Rocky Mountain spotted fever.
  • Monocytic leukemia, acute or chronic.
  • Chronic ulcerative colitis and regional enteritis as do some collagen diseases.

As a rule, the condition that causes increased monocytes is more likely to be a chronic condition.

In general, a mild monocytosis is due to infectious or inflammatory diseases, whereas cases of blood cancer (myelomonocytic leukemia, Hodgkin's lymphoma, etc.) are often related to severe monocytosis.

A decrease in the normal monocyte count is called monocytopenia and does not have diagnosis meaning. It may be seen in aplastic anemia or in some cases of leukemia, such as hairy cell leukemia.

Where can I find more information about monocyte count in the blood?

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Which values are considered a normal monocyte count in the blood?

The following values are considered to be normal values:

IMPORTANT: These levels are expressed in number /µl (microliter). They are an example of a healthy white man/woman of about 45 years old with no known disease and not taking any medication. The ranges can be different depending on the laboratory or on your personal circumstances.

Monocytes
Normality
130 /µl131 /µl132 /µl133 /µl134 /µl135 /µl136 /µl137 /µl
138 /µl139 /µl140 /µl141 /µl142 /µl143 /µl144 /µl145 /µl
146 /µl147 /µl148 /µl149 /µl150 /µl151 /µl152 /µl153 /µl
154 /µl155 /µl156 /µl157 /µl158 /µl159 /µl160 /µl161 /µl
162 /µl163 /µl164 /µl165 /µl166 /µl167 /µl168 /µl169 /µl
170 /µl171 /µl172 /µl173 /µl174 /µl175 /µl176 /µl177 /µl
178 /µl179 /µl180 /µl181 /µl182 /µl183 /µl184 /µl185 /µl
186 /µl187 /µl188 /µl189 /µl190 /µl191 /µl192 /µl193 /µl
194 /µl195 /µl196 /µl197 /µl198 /µl199 /µl200 /µl201 /µl
202 /µl203 /µl204 /µl205 /µl206 /µl207 /µl208 /µl209 /µl
210 /µl211 /µl212 /µl213 /µl214 /µl215 /µl216 /µl217 /µl
218 /µl219 /µl220 /µl221 /µl222 /µl223 /µl224 /µl225 /µl
226 /µl227 /µl228 /µl229 /µl230 /µl231 /µl232 /µl233 /µl
234 /µl235 /µl236 /µl237 /µl238 /µl239 /µl240 /µl241 /µl
242 /µl243 /µl244 /µl245 /µl246 /µl247 /µl248 /µl249 /µl
250 /µl251 /µl252 /µl253 /µl254 /µl255 /µl256 /µl257 /µl
258 /µl259 /µl260 /µl261 /µl262 /µl263 /µl264 /µl265 /µl
266 /µl267 /µl268 /µl269 /µl270 /µl271 /µl272 /µl273 /µl
274 /µl275 /µl276 /µl277 /µl278 /µl279 /µl280 /µl281 /µl
282 /µl283 /µl284 /µl285 /µl286 /µl287 /µl288 /µl289 /µl
290 /µl291 /µl292 /µl293 /µl294 /µl295 /µl296 /µl297 /µl
298 /µl299 /µl300 /µl301 /µl302 /µl303 /µl304 /µl305 /µl
306 /µl307 /µl308 /µl309 /µl310 /µl311 /µl312 /µl313 /µl
314 /µl315 /µl316 /µl317 /µl318 /µl319 /µl320 /µl321 /µl
322 /µl323 /µl324 /µl325 /µl326 /µl327 /µl328 /µl329 /µl
330 /µl331 /µl332 /µl333 /µl334 /µl335 /µl336 /µl337 /µl
338 /µl339 /µl340 /µl341 /µl342 /µl343 /µl344 /µl345 /µl
346 /µl347 /µl348 /µl349 /µl350 /µl351 /µl352 /µl353 /µl
354 /µl355 /µl356 /µl357 /µl358 /µl359 /µl360 /µl361 /µl
362 /µl363 /µl364 /µl365 /µl366 /µl367 /µl368 /µl369 /µl
370 /µl371 /µl372 /µl373 /µl374 /µl375 /µl376 /µl377 /µl
378 /µl379 /µl380 /µl381 /µl382 /µl383 /µl384 /µl385 /µl
386 /µl387 /µl388 /µl389 /µl390 /µl391 /µl392 /µl393 /µl
394 /µl395 /µl396 /µl397 /µl398 /µl399 /µl400 /µl401 /µl
402 /µl403 /µl404 /µl405 /µl406 /µl407 /µl408 /µl409 /µl
410 /µl411 /µl412 /µl413 /µl414 /µl415 /µl416 /µl417 /µl
418 /µl419 /µl420 /µl421 /µl422 /µl423 /µl424 /µl425 /µl
426 /µl427 /µl428 /µl429 /µl430 /µl431 /µl432 /µl433 /µl
434 /µl435 /µl436 /µl437 /µl438 /µl439 /µl440 /µl441 /µl
442 /µl443 /µl444 /µl445 /µl446 /µl447 /µl448 /µl449 /µl
450 /µl451 /µl452 /µl453 /µl454 /µl455 /µl456 /µl457 /µl
458 /µl459 /µl460 /µl461 /µl462 /µl463 /µl464 /µl465 /µl
466 /µl467 /µl468 /µl469 /µl470 /µl471 /µl472 /µl473 /µl
474 /µl475 /µl476 /µl477 /µl478 /µl479 /µl480 /µl481 /µl
482 /µl483 /µl484 /µl485 /µl486 /µl487 /µl488 /µl489 /µl
490 /µl491 /µl492 /µl493 /µl494 /µl495 /µl496 /µl497 /µl
498 /µl499 /µl500 /µl501 /µl502 /µl503 /µl504 /µl505 /µl
506 /µl507 /µl508 /µl509 /µl510 /µl511 /µl512 /µl513 /µl
514 /µl515 /µl516 /µl517 /µl518 /µl519 /µl520 /µl521 /µl
522 /µl523 /µl524 /µl525 /µl526 /µl527 /µl528 /µl529 /µl
530 /µl531 /µl532 /µl533 /µl534 /µl535 /µl536 /µl537 /µl
538 /µl539 /µl540 /µl541 /µl542 /µl543 /µl544 /µl545 /µl
546 /µl547 /µl548 /µl549 /µl550 /µl551 /µl552 /µl553 /µl
554 /µl555 /µl556 /µl557 /µl558 /µl559 /µl560 /µl561 /µl
562 /µl563 /µl564 /µl565 /µl566 /µl567 /µl568 /µl569 /µl
570 /µl571 /µl572 /µl573 /µl574 /µl575 /µl576 /µl577 /µl
578 /µl579 /µl580 /µl581 /µl582 /µl583 /µl584 /µl585 /µl
586 /µl587 /µl588 /µl589 /µl590 /µl591 /µl592 /µl593 /µl
594 /µl595 /µl596 /µl597 /µl598 /µl599 /µl600 /µl601 /µl
602 /µl603 /µl604 /µl605 /µl606 /µl607 /µl608 /µl609 /µl
610 /µl611 /µl612 /µl613 /µl614 /µl615 /µl616 /µl617 /µl
618 /µl619 /µl620 /µl621 /µl622 /µl623 /µl624 /µl625 /µl
626 /µl627 /µl628 /µl629 /µl630 /µl631 /µl632 /µl633 /µl
634 /µl635 /µl636 /µl637 /µl638 /µl639 /µl640 /µl641 /µl
642 /µl643 /µl644 /µl645 /µl646 /µl647 /µl648 /µl649 /µl
650 /µl651 /µl652 /µl653 /µl654 /µl655 /µl656 /µl657 /µl
658 /µl659 /µl660 /µl661 /µl662 /µl663 /µl664 /µl665 /µl
666 /µl667 /µl668 /µl669 /µl670 /µl671 /µl672 /µl673 /µl
674 /µl675 /µl676 /µl677 /µl678 /µl679 /µl680 /µl681 /µl
682 /µl683 /µl684 /µl685 /µl686 /µl687 /µl688 /µl689 /µl
690 /µl691 /µl692 /µl693 /µl694 /µl695 /µl696 /µl697 /µl
698 /µl699 /µl700 /µl701 /µl702 /µl703 /µl704 /µl705 /µl
706 /µl707 /µl708 /µl709 /µl710 /µl711 /µl712 /µl713 /µl
714 /µl715 /µl716 /µl717 /µl718 /µl719 /µl720 /µl721 /µl
722 /µl723 /µl724 /µl725 /µl726 /µl727 /µl728 /µl729 /µl
730 /µl731 /µl732 /µl733 /µl734 /µl735 /µl736 /µl737 /µl
738 /µl739 /µl740 /µl741 /µl742 /µl743 /µl744 /µl745 /µl
746 /µl747 /µl748 /µl749 /µl750 /µl751 /µl752 /µl753 /µl
754 /µl755 /µl756 /µl757 /µl758 /µl759 /µl760 /µl761 /µl
762 /µl763 /µl764 /µl765 /µl766 /µl767 /µl768 /µl769 /µl
770 /µl771 /µl772 /µl773 /µl774 /µl775 /µl776 /µl777 /µl
778 /µl779 /µl780 /µl781 /µl782 /µl783 /µl784 /µl785 /µl
786 /µl787 /µl788 /µl789 /µl790 /µl791 /µl792 /µl793 /µl
794 /µl795 /µl796 /µl797 /µl798 /µl799 /µl800 /µl801 /µl
802 /µl803 /µl804 /µl805 /µl806 /µl807 /µl808 /µl809 /µl
810 /µl811 /µl812 /µl813 /µl814 /µl815 /µl816 /µl817 /µl
818 /µl819 /µl820 /µl821 /µl822 /µl823 /µl824 /µl825 /µl
826 /µl827 /µl828 /µl829 /µl830 /µl831 /µl832 /µl833 /µl
834 /µl835 /µl836 /µl837 /µl838 /µl839 /µl840 /µl841 /µl
842 /µl843 /µl844 /µl845 /µl846 /µl847 /µl848 /µl849 /µl
850 /µl       
Medically reviewed by our Medical staff on 16/03/2021

Bibliography

  • Concise Book of Medical Laboratory Technology: Methods and Interpretations. 2nd Edition. 2015. Ramnik Sood. ISBN: 978-93-5152-333-8. Pag. 261.
  • A Manual of Laboratory and Diagnostic Test. 9th edition. Frances Fischbach. Marshall B. Dunning III. 2014. Pag 78. ISBN-10: 1451190891.
  • Laboratory tests and diagnostic procedures with nursing diagnoses (8th ed), Jane Vincent Corbett, Angela Denise Banks, ISBN: 978-0-13-237332-6, Pag. 55.

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