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Laboratory Test Directory

Total Homocysteine, Serum or Plasma

Components

Name Method Department Units
Total Homocysteine Chemiluminescence
Core Lab, Endocrinology umol/L

Specimen Requirements

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), with Gel

3 mL 1 mL
Alternate

Green tube (Lithium heparin), No Gel

3 mL 1 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 1 mL
Alternate

Red tube, (no anticoagulant), No Gel

Micro sample tube 1 mL
Alternate

Gold tube, (SST) with Gel

3.5 mL 1 mL
Alternate

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.3 mL
Stability

Refrigerated - 14 day(s)
Frozen - 12 month(s)

Specimen Preparation

  • Mix by gentle inversion immediately after collection
  • Transport to laboratory as soon as possible
  • Centrifuge within 6 hours, separate supernatant and refrigerate

Reasons for Rejection

  • Wrong collection tube
  • Gross hemolysis
  • Gross icterus
  • Gross lipemia
  • Contamination
  • Frozen whole blood
  • Wrong type of specimen

Comments

Do not use as a follow-up to an abnormal newborn screening test. A serum amino acid profile is the recommended test for the follow-up to an abnormal state newborn screening test.

CPT Code

  • 83090