Knowledge Burst Unit 9

Question 1

Counting the number and size of electrical interference’s created by blood cells as they pass through a small aperture is a description of which of the following principles?

Answer 1

Electronic impedance

Question 2

What technology minimizes the problems of a rigid aperture including protein buildup, coincidence, and a single cell being counted twice?

Answer 2

Hydrodynamic focusing

Question 2

Forward light scatter, when used in an instrument employing the optical scatter principle, correlates with cell:

Answer 2

size

Question 3

What does the pneumatic system of cell counters do?

Answer 3

Operates the valves and moves the sample

Question 4

How do Beckman Coulter and Abbott instruments count red cells and platelets?

Answer 4

Electrical impedance

Question 5

Which of the following is determined by light transmission between 525 and 555 nm?

Answer 5

Hemoglobin

Question 6

Which of the following is always calculated on cell counter?

Answer 6

MCHC

Question 7

What is the mechanism for the three-part differential found in older Coulter instruments or those designed for smaller labs?

Answer 7

Impedance after cytoplasm shrinkage

Question 8

What is the greatest limitation of automated cell counters?

Answer 8

Inherent specimen problems leading to occasional spurious results