Liquid chromatography-tandem mass spectrometry (LC-MS/MS)
Rejection Criteria
Samples collected in serum separator tube Citrate (light blue top) plasma Avoid repeated freeze/thaw cycles
Reference Range(s)
Positive Cutoff: 10 NG/ML
Specimen Requirements
Preferred Specimen
Sodium fluoride/potassium oxalate (gray top) tube
Minimum Volume
1 mL plasma
Sample Stability
After separation from cells: 1 week room temperature 2 weeks refrigerated 3 years frozen
Transport Temperature
Refrigerated
Collection Instructions
1 mL sodium fluoride/potassium oxalate plasma. Centrifuge sample and separate plasma from cells immediately. Transfer plasma to a plastic transport tube. Refrigerate.