Keep Current with David Steensma. Twitter may remove this content at anytime, convert it as a PDF, save and print for later use! You can practice here first or read more on our help page! This site is made by just three indie developers on a laptop doing marketing, support and development!
Read more about the story. Become Premium. Too expensive? Thank you for your support! David Steensma. We use this term devoid of its original context, sometimes based on lab reports displayed in a column! But why is this "left"? We have Josef Arneth to thank for the left-shift term. It was a careful study of nuclear lobes of neutrophils in various conditions.
Arneth tabulated neutrophils in 5 columns, left to right, depending on their lobe number. Papers appeared for about 30 years comparing Arneth counts in various illnesses and ethnic groups; this one is from in Australia. A technician reviewing a blood smear might use a counter like this s model to tabulate white cell types One can still find mechanical counters in many hematology laboratories.
When I was a hematology fellow and had to count manual diffs, there was one of these next to the microscope. Buttons for immature cells — myelocytes, bands etc — were to the left of those for mature cells. Mechanical counters are seen in a few other settings.
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