Activated Partial Thromboplastin Time (APTT), Plasma

Additional Codes

LAB325

Properly filled 9:1 ratio (blood to anticoagulant); 3.2% NaCitrate tube

Venous Draw; properly filled 9:1 ratio (blood to anticoagulant)

Light Blue Sodium Citrate

Preferred- 2.7mL Lt. Blue (3.2% NaCitrate) tube

Acceptable- 1.8 mL Lt. Blue (3.2% NaCitrate) tube

0.25 ml of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube

Ambient	Plasma – 4 hours – Specimens must be centrifuged within 1 hour of phlebotomy if the patient is therapeutically heparinized.
Refrigerated (4°C to 8°C)	N/A
Frozen(-70°C to -20°C)	2 Weeks@ -20°C; 1 year @ -70°C

24 - 36.8 seconds

Seconds

>100 seconds

Hemolysis Threshold	N/A
Icterus Threshold	N/A
Lipemia Threshold	N/A
Interfering Subtances/Other	Short draws, over draws, clotted, improperly labeled

Days and Time Performed	24/7
Expected Turn Around Time	Routine: within 4 hours of arrival to lab Stat:within 1 hour of arrival to lab
Stat Availability	Yes
Performing Bench	CPH Coagulation
Methodology/Method Description	Stago STA Compact MAX

85730

2025