Types of Blood cells

1. Red blood cells / Erythrocytes
2. White blood cells / Leukocytes
• Granulocytes --- Consists of granules, pinkish cytoplasm, a multi-lobed nucleus and is 1.5~2.0 times larger than RBC.
• Types: 
• Neutrophils (40%~75%) --- common, neutral granules
• Eosinophils (1%~6%) --- basic granules (stained red)
• Basophils (0~7%) --- rare, acid granules(stained blue)
  
• Lymphocytes  (20%~45%) --- Round,lumpy dark stained chromatin, blue cytoplasm, may/may not contain granules.
• Types:
• Small lymphocytes --- unable to see the cytoplasm under microscope.
• Large lymphocytes
  
• Monocytes --- Largest WBC, amoeboid movement with pseudopods coming out, dull grey-blue cytoplasm, reddish blue granules, reddish blue granules, vacuole may present.
  
  
3. Platelets / Thrombocytes

• Fragments of megakaryocytic cytoplasm.

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*Abnormal or immature blood cells should not present in the blood circulation. ( The nucleus consist of nucleolus )*



*When a patient is infected by virus (eg. Dengue), some atypical lymphocytes ( darker blueish cytoplasm) will be found in the blood.*