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Fibrinogen, Functional

Item Value
Clinical Questions Does my patient have hemophagocytic lymphohistiocytosis?
Approval req'd? No
Available Stat? Yes
Test code FIB
Test group Fibrinogen
Performed by Parnassus & Mt. Zion Hematology
In House Availability Test available 24 hours per day 7 days per week
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..

For patients with Hct's ≥ 55% please contact Hematology (x3-1747) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
Container type Blue (2.7 mL) or Lt. Blue (1.8 mL) top filled to full extent of vacuum
Amount to Collect
Blue top 2.7 mL blood
Lt. Blue top 1.8 mL blood


Note: If hepabsorption is required draw a full Blue top (2.7 mL)
Sample type Citrated plasma
Preferred volume 1.5 mL plasma
Min. Volume 1 mL plasma
UCSF Rejection Criteria Samples collected in outdated blue top vacutainer. Over-filled or under-filled tubes may be rejected
Units mg/dL
Normal range 202-430 mg/dL

Note:: Fibrinogen results may be inaccurate in patients who have recently received fibrinolytic therapy.
Critical value ≤ 100 mg/dL if new finding within previous 24 hours. A value ≤ 50 mg/dL is always phoned.
Synonyms Factor I; Quantitative fibrinogen; functional fibrinogen
Stability Specimen is stable for up to 24 hours at room temperature.
Turn around times STAT 1 hour, Routine 4 hours
Additional information Fibrinogen results may be inaccurate in patients who have recently received fibrinolytic therapy.
CPT coding 85384
LOINC code 3255-7
Last Updated 10/15/2014 12:11:33 PM
Entry Number 383
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