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Lab Test Dictionary

Methotrexate (648) (Back-Up Only)


Immunoassay (IA)

Specimen Type

Serum or Plasma

Performing Lab

Quest Diagnostics SD RRL

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

2-4 Hours

Collection Information

Specimen Required

1-2 mL Blood

Container Type

Red Top (No Additive)

Collection Instructions

Protect from light. Record hours from last dose on specimen container and in order comments. Plasma collected in a sodium heparin (green-top), Fluoride/Oxalate (gray-top) or EDTA (lavender-top) tube is also acceptable.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 24 Hours; Refrigerated: 24 Hours; Frozen: 5 Days

Rejection Criteria

Serum or Plasma Separator Tube (SST/PST); Received thawed

Test Volume Required

1 mL Serum or Plasma

Minimum Test Volume

0.2 mL Serum or Plasma

Processing Instructions

Send to Quest STAT. Call Quest courier for pick up (866) 697-8378 option 3, 6, and 2. (Acct # 92123990). Alternative number for STAT pick up (800) 741-8939.

CPT Codes