Can Pseudothrombocytopenia be recognised at first look?

Area of Science:

• Hematology
• Clinical Pathology

Background:

• Thrombocytopenia, a low platelet count, can be either true (pathological) or pseudo (artifactual).
• Distinguishing between true and pseudo thrombocytopenia is crucial for accurate diagnosis and patient management.
• Misdiagnosis can lead to unnecessary anxiety and interventions.

Purpose of the Study:

• To identify laboratory parameters that effectively differentiate pseudothrombocytopenia from true thrombocytopenia.
• To provide guidance for clinicians managing patients with low platelet counts.

Main Methods:

• A study included 107 patients with thrombocytopenia referred to an adult hematology clinic.
• Patients were diagnosed with acute myeloid leukemia, immune thrombocytopenia, or pseudothrombocytopenia.
• Hemogram parameters, control platelet counts, and peripheral smear findings were analyzed.

Main Results:

• Statistically significant differences were observed in control platelet values and the red cell distribution width/platelet ratio among the three groups.
• Receiver operating characteristic analysis identified specific thresholds for platelet count (≤ 38,000/µL), serial platelet count difference (≤ 11,000/µL), and red cell distribution width/platelet ratio (≥ 0.413) indicative of true thrombocytopenia.
• These parameters demonstrated high sensitivity and specificity in differentiating true from pseudothrombocytopenia.

Conclusions:

• The difference between initial hemogram parameters and control platelet counts can guide the differentiation of pseudothrombocytopenia from true thrombocytopenia.
• These findings can help reduce patient and physician anxiety.
• This diagnostic approach may prevent unnecessary patient referrals and interventions.