Homocysteine Total (HCB)

Department: Chemistry
Test Synonym(s): LAB93, HCB
CPT Codes: 83090
Methodology: CMIA
Reference Range: 5 - 15 mcmol/L
Tube Type: Lavender top (EDTA)
Specimen: Blood
Pediatric Requirements: 1 lavender top bullet
Volume: 2 mL blood
Minimum Volume: 0.25 mL plasma
Temperature: Refrigerated
Stability: Refrigerated: 7 days
Reasons for Rejection: Hemolysis; improper collection, EDTA tube not stored on ice/separated from cells for more than 6 hours
Days Performed: Monday - Saturday
Times Performed: Batch analyzed at 10:30 a.m. Not available STAT
TAT: Same day
Special Instructions: Fasting specimen. Deliver to the lab immediately. Centrifuge, separate and refrigerate immediately.

---

Search Help

---

Search Options for the Test Directory:

1. Enter the test name in the Keyword search field.
Hint: You can also enter any part of the test name to expand the search.
(Example: you can type "west" or "sed" or "rate" to find Westergren Sedimentation Rate)

2. Enter the Vanderbilt Test Code, if known.

3. Choose one of the letter boxes to display a list of all test names and keywords starting with that letter.

If you are unable to find a test in our directory, please contact VPLS at
1-800-551-5227 or e-mail emily.k.thompson@vumc.org.