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HelpTest Code PTTMX Mixing Studies, APTT
Additional Codes
Epic EAP: LAB326
Epic Description: APTT, MIXING STUDIES
Synonym
APTT Mixing Study
Intrinsic Pathway Study
Intrinsic Study
Specimen Type
Blood
Specimen Required
| Collection Container | Preferred Volume | Minimum Volume | |
|---|---|---|---|
| Preferred |
Light Blue, Sodium Citrate |
3 X 2.7 mL | 2 X 2.7 mL |
Instructions for Collection and Transport
Must be in CSR within one hour of collection. If the patient’s known hematocrit value is above 55%, an adjustment of the ratio of anticoagulant to blood is necessary. Call the laboratory for a special collection tube for that hematocrit value.
Centrifuge ASAP for 15 minutes at 3,000 rpm’s. Remove plasma and aliquot into two plastic vials. Freeze and transport frozen on dry ice.
Note: It is extremely important that plasma be platelet poor before freezing. If platelet amount is not <10,000, centrifuge plasma again and re-aliquot plasma before freezing. Do not thaw.
Home Health Agencies: Not available for collection by Home Health.
Aliquot Requirements
CITRATED Plasma
Optimum 2 X 2.0 mL
Minimum 1.5 mL
Performing Lab
Hematology Lab
Assay Frequency
Monday thru Friday 8:30 am – 3:00 pm
Routine Turnaround Time
24 hours
CSR Storage Requirements
Centrifuge ASAP for 15 minutes at 3,000 rpm’s. Remove plasma and aliquot into two plastic vials. Freeze plasma. Note: Plasma should be platelet poor before freezing. If unsure of centrifuge performance, centrifuge plasma again before freezing. Do not thaw.
CPT Code Information
85732