Knowledge Burst Unit 5

Question 1

Which of the following WBC is the precursor of the tissue macrophage and is referred to as a “scavenger” or “big eater”?

Answer 1

Monocyte

Question 2

A WBC is 12-18 microns in diameter. The cytoplasm is voluminous, gray-blue, and filled wit tiny granules and vacuoles. The nucleus is irregular in shape and convoluted. The chromatin is delicate and somewhat linear. Name the cell.

Answer 2

Monocyte

Question 3

Limitations of the manual 100 WBC differential count include:

Answer 3

Sampling errors, cell distribution, and human inconsistency

Question 4

A 1500 the nurse in the SICU called the lab to request a differential add-on to a blood sample drawn during morning collection at 0500. What is the best course of action?

Answer 4

Obtain a new specimen because the specimen is more than 4 hrs old

Question 5

All of the following are phagocytic EXCEPT:
- Neutrophils
- Lymphs
- monos
- eos

Answer 5

Lymphs

Question 6

In preparing a blood smear, what is the usual angle at which the spreader slide should be held?

Answer 6

30-45 degrees

Question 7

If fibrin stands are observed during the low-power scan of the thin edge of a stained blood film, the tech should?

Answer 7

Stop and request a new specimen

Question 8

An accumulation of WBCs in the feathered end of a wedge-type blood film could be due to:

Answer 8

Spreading the blood too slowly

Question 9

Histamine and other mediators of the inflammatory response are contained in the granules of:

Answer 9

Basophils

Question 10

If nucleated RBCs are seen during a leukocyte differential count they are:

Answer 10

Counted and reported but not included as a percentage of the 100 cell diff. If >5 NRBCs noted, then a total white blood cells count correction would be performed