Abnormal platelet count can have various causes, ranging in severity from 'needs attention' to 'critical'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose abnormal platelet count, we could:
|Lupus (SLE)||1%||Ruled out|
Platelet count (PLT). Unit: x10^3/uL or x10^9/L
Possible responses:→ Don't know
→ Under 100
→ 100 to 149
→ 150 to 450 (normal)
→ Over 450
Lupus is suggested if thrombocytopenia (a low platelet count of under 100,000 platelets per cubic millimeter) is detected in the absence of drugs that are known to induce it.
Hepatitis C may cause or contribute to a secondary ITP.