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Lab Manual for Moffitt-Long and Mount Zion

Lab Manual for SFGH

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Coumadin

Item Value
Approval req'd? No
Available Stat? No
Test code MOLT (Order in Apex as 'Miscellaneous Outside Lab Test' using the complete test name above)
Performed by Quest
Sendout? Yes
Method HPLC
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.
Container type Blue top filled to full extent of vacuum x2
Amount to Collect 5.4 mL blood
Sample type Citrated plasma
Preferred volume 3 mL plasma
Min. Volume 1.2 mL plasma
UCSF Rejection Criteria Room temp sample. Samples collected in outdated blue top vacutainer. Over-filled or under-filled tubes may be rejected.
Processing notes Refrigerate or freeze sample at -20C. Order Quest Nichols test # 936N.
Units µg/mL (mcg/mL)
Normal range 1.0-10.0 ug/mL
Toxic > 10.0 ug/mL
Synonyms warfarin
Stability Refrigerated 2 weeks, frozen at -20C 18 months
Turn around times Test run Monday, Wednesday, Friday. Result available: 4 to 6 days
Additional information Standard method for monitoring therapeutic coumadin is the Prothrombin Time.
CPT coding 80299-90
Last Updated 2/20/2014 3:04:03 PM
Entry Number 260

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

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