Specimen: 2 mL (1 mL min.) serum from 1 SST. Ship refrigerated or frozen. Overnight fasting is preferred. Recommended specimen for patient on UDCA treatment: Before morning dose. Stability (Room): 6 hrs Stability (Refrigerated): 1 week Stability (Frozen): 3 months Method: Enzymatic Colorimetric Comment: For patients treated with UDCA, LC-MS/MS is the recommended method for...