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VITAMIN B3

B3

1 mL serum, protect from light

serum separator tube

1 mL serum. Allow SST to clot in an upright position for at least 30 minutes, then centrifuge sample within 2 hours of collection. Transfer serum to a plastic transport tube. Clearly label tube as serum. Freeze. Critical frozen (CFZ). Protect sample from light during collection, storage and transport. When multiple tests are ordered, submit separate tube for this test.

Critical Frozen (cfz). Specimen Stability: 3 hours room temperature; unacceptable refrigerated; 1 month frozen

hemolyzed samples, room temperature samples, refrigerated samples, samples not protected from light, whole blood, body fluids

7 Days

liquid chromatography-tandem mass spectrometry (LC-MS/MS)

Alternate Specimen Requirements: 1 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. Freeze. Critical frozen (CFZ). Protect sample from light during collection, storage and transport. When multiple tests are ordered, submit separate tube for this test. 1 mL EDTA (lavender top) or heparin (green top) plasma. centrifuge sample and separate plasma from cells within 2 hours of collection. Transfer plasma to a plastic transport tube. Clearly label tube as EDTA or heparin plasma. Freeze. Critical Frozen (CFZ). Protect sample from light during collection, storage and transport. When multiple tests are ordered, submit separate tube for this test.

84591