aPTT Levels in Toddlers with Hemophilia A: Reference Range and Interpretation

The normal activated partial thromboplastin time (aPTT) reference range for toddlers is approximately 25–35 seconds. In hemophilia A (factor VIII deficiency), aPTT is significantly prolonged.

Severe Hemophilia A

aPTT values often exceed 100 seconds, reflecting severely impaired clot formation and high bleeding risk.

Clinical Management

• Regular aPTT monitoring is essential for assessing coagulation status.
• Guides factor VIII replacement therapy dosing.
• Helps evaluate treatment efficacy and adjust prophylaxis regimens.

Comprehensive coagulation panels (including factor VIII activity) provide a complete picture for optimal care.