Item Value
Test name Factor 11 Activity
Available Stat? No
Turn around times 1-3 days
In House Availability Test run 0800-1500 Monday-Friday

Note: If testing is needed outside of these hours, contact Hematology. For Parnassus patients call 3-1747, for Mission Bay patients call 6-0194.
Performed by Parnassus & Mission Bay Hematology
Normal range
Day 1 10-66%
Day 5 23-87%
Day 30 27-79%
Day 90 41-97%
Day 180 38-134%
≥ 18 year old 72-161%


Pediatric Reference (Day 1 – 180): Andrew, M et al. Development of the human coagulation system in the full-term infant. Blood. 70:165-72).
Container type Blue top filled to full extent of vacuum
Amount to Collect 2.7 mL blood
Collection Instructions 1. Check the expiration date on the label of the blue top vacutainer before drawing the patient.

2. For blood collection in a sodium citrate blue top, the tube must be filled to above the Minimum Fill Indicator on the tube. It is crucial to wait and allow the tube to stop filling before removing it from the needle.

3. With use of a butterfly needle, draw about 1 cc using a separate blue top to remove air from tubing, discard the first tube and then draw a second blue top tube filled to the full extent of the vacuum.

4. Tubes should not be filled past the Maximum Fill dashed line by either using a syringe or removing the tube cap.

Deliver immediately to the laboratory.

For patients with Hct's ≥ 55% please contact Hematology (Parnassus: 3-1747, Mission Bay: call 6-0194) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
Sample type Citrated plasma

If you have additional questions regarding this test, please call: 415-353-1667