Methodology
Immunoassay (IA); Mass Spectrometry (MS)
Specimen Type
Serum
Performing Lab
Quest Diagnostics San Juan Capistrano
Epic ID
Other Reference Test
Collection Information
Specimen Required
2.8-8 mL Blood
Container Type
Red Top (No Additive)
Collection Instructions
DO NOT expose specimen to light for more than 24 hours. Wrap tube in aluminum foil to protect from light. Samples should not be collected from a patient who has received vitamin B12 injection therapy within the past week.
Processing Information - Lab Use Only
Transport Temperature
Room Temp-OK/Refrigerated-OK/Frozen-OK
Specimen Stability
Room Temp: 4 Days; Refrigerated: 7 Days; Frozen: 28 Days
Rejection Criteria
Gross hemolysis
Test Volume Required
4 mL Serum (Separate serum into three tubes, 1 tube with 2 mL and 2 tubes with 1 mL each)
Minimum Test Volume
1.4 mL Serum (Separate serum into three tubes, 1 tube with 2 mL and 2 tubes with 1 mL each)
Processing Instructions
Do not expose specimen to light for more than 24 hours. Send serum in an amber tube. If amber tube is not available, wrap tube in aluminum foil to protect from light. Separate serum into three tubes, 1 tube with 2 mL and 2 tubes with 1 mL each.
Included Tests
Intrinsic Factor Blocking Antibody, Methylmalonic Acid and Vitamin B12
CPT Codes
82607, 83921, 86340 (not genetic)
Revised
11/17/25
Initials
SA