This test requires submission of 2 separate serum samples.
1. 2 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. Refrigerate.
Note: Do not collect samples from patients receiving therapy with high biotin doses (>5 mg/day) until at least 8 hours following the last biotin administration.
2. 2 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 tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. Freeze. Critical Frozen (CFZ).
When multiple tests are ordered, submit separate tubes for this test.