• Source: Hematology analyzer

Hematology analyzers (also spelled haematology analysers in British English) are used to count and identify blood cells at high speed with accuracy. During the 1950s, laboratory technicians counted each individual blood cell underneath a microscope. Tedious and inconsistent, this was replaced with the first, very basic hematology analyzer, engineered by Wallace H. Coulter. The early hematology analyzers relied on Coulter's principle (see Coulter counter). However, they have evolved to encompass numerous techniques.




Uses


Hematology analyzers are used to conduct a complete blood count (CBC), which is usually the first test requested by physicians to determine a patient's general health status. A complete blood count includes red blood cell (RBC), white blood cell (WBC), hemoglobin, and platelet counts, as well as hematocrit levels. Other analyses include:

RBC distribution width
Mean corpuscular volume
Mean corpuscular hemoglobin
Mean corpuscular hemoglobin concentrations
WBC differential count in percentage and absolute value
Platelet distribution width
Platelet mean volume
Large platelet cell ratio
Platelet criteria




Techniques


Flow cytometry
Spectrophotometry
Absorption spectroscopy
Transmission Turbidimetry
Electrical impedance (Coulter's principle)
Digital microscopy with AI




Types






= 3-part differential cell counter

=

A 3-part differential cell counter uses Coulter's principle to find the size and volume of the cell. The sample is lysed and dissolved into an electrolyte solution in a container, which also holds a smaller container. The smaller container has two pumps running to and from its solution, one creating a vacuum and the other replacing the lost solution. The smaller container has a small hole (an orifice) near the bottom of the container. Coulter's principle is applied through the use of two electrodes. One electrode (the internal electrode) is within the smaller container, and the other (the external electrode) is outside of the smaller container but within the electrolyte/sample solution. As the vacuum draws the sample cells through the orifice, the cell momentarily causes electrical resistance to the current as it passes through the orifice. This resistance is recorded, measured, amplified, and processed which can then be interpreted by the computer into a histogram. The 3-part analyzer is able to differentiate between three types of white blood cells (WBCs): neutrophils, lymphocytes, and monocytes.




= 5-part differential cell counter

=
This type of hematology analyzer utilizes both Coulter's principle and flow cytometry to determine the granularity, diameter, and inner complexity of the cells. Using hydrodynamic focusing, the cells are sent through an aperture one cell at a time. During this, a laser is directed at them, and the scattered light is measured at multiple angles. The absorbance is also recorded. The cell can be identified based on the intensity of the scattered light and the level of absorbance. A 5-part cell counter can differentiate all WBC types (neutrophils, lymphocytes, basophils, eosinophils, and monocytes). 5-part analyzers are more expensive than 3-part analyzers, but provide more in-depth information about the sample. Specific jobs, such as allergy testing, require 5-part differential analysis. However, most medical tasks can be completed with the 3-part analyzer.




Components


The hematology analyzer is broken down into five key components:

Power source
Control unit
Sample Reagent Tray
Collecting system
Data storage
Processing system




Producers


These are the major companies that are known to make quality Hematology Analyzers for hospitals and laboratories:

Beckman Coulter
Sysmex Corporation
HORIBA Ltd
Abbott Laboratories
Bio-Rad Laboratories
Siemens AG
Mindray Medical International Limited
Boule Diagnostics AB
Roche Diagnostics
Nihon Kohden Corporation.
Seamaty Technology




References

Kata Kunci Pencarian:

• Hematology analyzer
• Complete blood count
• White blood cell differential
• Macrocytosis
• Idexx Laboratories
• Mean corpuscular hemoglobin concentration
• Coulter counter
• Automated analyser
• Hemoglobin
• Mindray