Guide to Diagnostic Tests
Partial thromboplastin time
Test/Range/Collection
Partial thromboplastin time, activated, plasma (aPTT)
25–35 seconds
(laboratory-specific)
Panic: ≥60 seconds (off heparin)
Blue
$$
Do not contaminate specimen with heparin.
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Citation
Nicoll, Diana, et al. "Partial Thromboplastin Time." Guide to Diagnostic Tests, 7th ed., McGraw-Hill Education, 2017. Emergency Central, emergency.unboundmedicine.com/emergency/view/GDT/619249/all/Partial_thromboplastin_time.
Nicoll DD, Lu CMC, McPhee SJS. Partial thromboplastin time. Guide to Diagnostic Tests. McGraw-Hill Education; 2017. https://emergency.unboundmedicine.com/emergency/view/GDT/619249/all/Partial_thromboplastin_time. Accessed May 16, 2025.
Nicoll, D., Lu, C. M., & McPhee, S. J. (2017). Partial thromboplastin time. In Guide to Diagnostic Tests (7th ed.). McGraw-Hill Education. https://emergency.unboundmedicine.com/emergency/view/GDT/619249/all/Partial_thromboplastin_time
Nicoll DD, Lu CMC, McPhee SJS. Partial Thromboplastin Time [Internet]. In: Guide to Diagnostic Tests. McGraw-Hill Education; 2017. [cited 2025 May 16]. Available from: https://emergency.unboundmedicine.com/emergency/view/GDT/619249/all/Partial_thromboplastin_time.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC
T1 - Partial thromboplastin time
ID - 619249
A1 - Lu,Chuanyi Mark,
AU - Nicoll,Diana,
AU - McPhee,Stephen J,
BT - Guide to Diagnostic Tests
UR - https://emergency.unboundmedicine.com/emergency/view/GDT/619249/all/Partial_thromboplastin_time
PB - McGraw-Hill Education
ET - 7
DB - Emergency Central
DP - Unbound Medicine
ER -
