Normal Reference Ranges
Adult
150 - 450 x10³/µL
Pediatric
150 - 450 x10³/µL
Clinical Significance
Essential for primary hemostasis. Count < 50k increases bleeding risk; < 10k increases risk of spontaneous severe hemorrhage.
Causes of High
- Reactive (infection, bleeding)
- Essential thrombocythemia
- Splenectomy
Causes of Low
- ITP / TTP
- DIC
- Cirrhosis/Splenomegaly
- Bone marrow failure
- Heparin-induced thrombocytopenia (HIT)