Below the range
Common causes of a low Activated Partial Thromboplastin Time (aPTT)
- Early DIC (hypercoagulable phase)
Looking for the other direction? See what causes a high Activated Partial Thromboplastin Time (aPTT).
All tests · Coagulation Studies · Activated Partial Thromboplastin Time (aPTT)
Below the range
What causes a low Activated Partial Thromboplastin Time (aPTT)?
Normal range 25-35 seconds. Specimen: Plasma (sodium citrate). See the full Activated Partial Thromboplastin Time (aPTT) reference page for critical values and nursing considerations.
What is the normal range for Activated Partial Thromboplastin Time (aPTT)?
The standard teaching reference range for Activated Partial Thromboplastin Time (aPTT) is 25-35 seconds. This value is measured in plasma (sodium citrate).
| Specimen | Plasma (sodium citrate) |
|---|---|
| Conventional range | 25-35 seconds |
| SI range | 25-35 seconds |
| Critical value | > 70 seconds (bleeding risk) |
| Panel | Coagulation Studies |
Full details, including nursing considerations, on the Activated Partial Thromboplastin Time (aPTT) normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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