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Homocysteine, Total

Tube Type

Test ID   LAB93
EPIC Order
CPT Code(s)   83090
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station   Routine: 30
Specimen Routine: 2 mL of blood/EDTA plasma(lavender top), COLLECT ON ICE; see below for alternate specimen types and comments
Once separated from the cells, plasma is stable:
Room temperature: 3 days
Refrigerator: 10 days
Frozen: 1 month
  micro: 300 µL blood/EDTA plasma/lavender top bullet, COLLECT ON ICE
Availability Routine: 24 hrs/day
Turnaround Time Routine: 2 hrs
Reference Range Normal: 3.7 - 13.9 µmol/L
Alternate Specimen
2mL heparinized plasma (green top), Collect on Ice
2mL serum (serum separator tube), Collect on Ice
Deliver to Laboratory Immediately.
If Outpatient, maintain on ice during transport to laboratory. If possible, centrifuge in refrigerated centrifuge, separate and transport plasma ON ICE.
SAMPLE is NOT STABLE at ROOM TEMPERATURE if left on the cells.

Reviewed by Christopher Parker on July 13, 2021

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514