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Lab Manual for Moffitt-Long and Mount Zion

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Oxalic acid, plasma

Item Value
Approval req'd? No
Available Stat? No
Test code OXALP
Test group Oxalate
Performed by Mayo
Sendout? Yes
Method Spectrophotometry
Patient Preparation Patient should be fasting (12 hours) and should avoid taking vitamin C supplements for 24 hours prior to draw.
Collection Instructions Place green top tube on wet ice immediately, transport blood tube on ice to the specimen processing section of Clinical Laboratories asap.
Container type Dark Green top (on ice)
Amount to Collect 10 mL blood
Sample type Heparinized plasma
Preferred volume 5 mL plasma
Min. Volume 2 mL plasma
UCSF Rejection Criteria Sample not received on ice or delivered > 30 min after collection.
Processing notes Centrifuge sample at 4C in a refrigerated centrifuge for 10 minutes at 2000 rpm within 1 hour of draw.

IMPORTANT: After centrifugation, bring the plasma specimen to Chemistry so the pH can be adjusted to a pH of 1.0 to 3.5 (ideal range is 2.3 to 2.7).

Freeze sample at -20C and send frozen in a plastic vial on dry ice to China Basin sendouts. Do not allow to thaw.

Order Mayo test # 81408.
Ref Lab Rejection Criteria Thawed, non-acidified or non-heparinized samples.
Units µmol/L
Normal range < 1.8 µmol/L
Synonyms Oxalate
CPT coding 83945-90
LOINC code 15085-4
Last Updated 5/30/2013 9:58:30 AM
Entry Number 1084
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