A technician looks at 200 white cells under the microscope…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A technician looks at white cells under the microscope. She counts neutrophils, lymphocytes, monocytes, eosinophils and basophils.
- What per cent are neutrophils?
- What per cent are lymphocytes?
- What per cent are eosinophils?
- Which count is above the normal range of to ?
Need a reminder? The key ideaShow
Blood is about plasma and formed elements. A healthy adult has to million red cells in each mm³. The blood holds to g of haemoglobin in each mL in a woman and to g in a man. There are to white cells in each mm³. One mL is mm³. The white cells, from most to least: neutrophils, lymphocytes, monocytes, eosinophils, basophils.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Total: cells.
Plan. Change each count to a per cent, then compare with the normal ranges.
Step 1. Neutrophils. . The normal range is to .
Step 2. Lymphocytes. . The normal range is to .
Step 3. Eosinophils. .
Step 4. The high count. The normal range for eosinophils is to , so the is high. A high eosinophil count goes with an allergy or a worm infection.
Answer: ; ; ; the eosinophils.
Check. Monocytes are and basophils . The five shares add up to .
Source. Bain, Bates and Laffan (2017), Dacie and Lewis Practical Haematology, 12th edition, reference ranges.
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