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Also called: 3-part, 5-part differential

3-Part vs 5-Part Haematology Analyser

Both run a full blood count; they differ in how finely they split the white cells — and in what they cost to run every day.

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The real difference

A 3-part analyser sorts white cells by size into lymphocytes, mid-sized cells and granulocytes. A 5-part analyser adds optical or chemical methods to report neutrophils, lymphocytes, monocytes, eosinophils and basophils individually.

Side by side

3-part5-part
Eosinophils reported separatelyNo (inside mid cells)Yes
Basophils and monocytesNo (inside mid cells)Yes
ReagentsFewerMore
MaintenanceSimplerMore involved
Cost per testLowerHigher
Typical buyerGP and polyclinicHospital lab, specialist centre, high-volume lab

Choose 3-part if…

  • You run fewer than a few dozen FBCs a day.
  • Your main questions are anaemia, infection screening and platelet trends.
  • Running cost and simplicity matter more than a full five-way differential.

Choose 5-part if…

  • You need eosinophil counts (allergy, parasites) or monocyte and basophil counts reported.
  • You run a lab with high daily volume or many abnormal samples.
  • You want fewer manual films because the analyser classifies more cells itself.

Frequently asked questions

Is a 5-part analyser more accurate?
Not for the basic counts — both count red cells, haemoglobin and platelets well. The 5-part analyser gives a more detailed white-cell differential.
Can I upgrade from 3-part to 5-part later?
Not on the same machine. Plan for your expected volume in the next few years when you buy.
Why do 5-part analysers cost more to run?
They use more reagents per test, often including stains and extra lysing reagents, and need more maintenance.

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