All tests · Coagulation Studies · Activated Partial Thromboplastin Time (aPTT)
Above the range
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.
Above the range
Looking for the other direction? See what causes a low 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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