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BONE MARROW EXAMINATION labTest

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BONE MARROW EXAMINATION labTest
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BONE MARROW EXAMINATION labTest

Sometimes a sample of bone marrow must be examined to determine why blood cells are abnormal or why there are too few or too many of a specific kind of blood cell. A doctor can take two different types of bone marrow samples:


Bone marrow aspirate: Removes fluid and cells by inserting a needle into the bone marrow and sucking out fluid and cells


Bone marrow core biopsy: Removes an intact piece of bone marrow using a coring device (similar to a larger diameter needle)

The bone marrow aspirate shows what cells, normal and abnormal, are present in the bone marrow. The core biopsy shows how full the bone marrow is with cells and where the cells are located within the marrow. Both types of samples are usually taken from the hipbone (iliac crest), although aspirates are rarely taken from the breastbone (sternum). In very young children, bone marrow samples are occasionally taken from one of the bones in the lower leg (tibia).

Cell Type Normal Adult Range Bone Marrow %

Blast 0.1 - 1.7

Promyelo 1.9 - 4.7

Myelo 8.5 - 16.9

Metamyelo 7.1 - 24.7

Band 9.4  - 15.4

Seg 3.8 - 11

Eos Myelo 0.2 - 1.4

Eos 0.2 - 6

Baso 0 - 0.2

Lymph 8.6 - 23.8

Plasma Cell 0 - 3.5

Mono 0 - 0.6

Mast Cells 0 - 0.2

Histio 0 - 0.8

Pronormo 0.1 - 1.1

Baso. Normo 0.4 - 2.4

Poly Normo 13.1 - 30.1

Ortho Normo 0.3 - 3.7

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BONE MARROW EXAMINATION labTest

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