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Test Code LAB2434 Methotrexate Level CSF

Important Note

PROTECT FROM UV LIGHT.

Clinical System Name

Methotrexate Level CSF

Synonyms

MTX CSF

Sample Requirements

Specimen: CSF

Container(s):  Sterile Screw-capped Container

Preferred Vol: 1.0 mL

Minimum Vol: 0.25 mL

 

Note: Protect sample from light.  In-patients:  wrap paper towel around tube and seal with one piece of tape.  Off-site:  wrap tube in foil.  Specimen stable under fluorescent lighting for up to 4 hours.      

          

Processing Instructions

Reject due to: prolonged light/UV exposure, age of specimen

Spin: Y

Aliquot: Y

Storage location:  Core 5 Chemistry refrigerator.

 

Off-site collection: Protect sample from light by wrapping tube in foil.  Note time of collection.  Send refrigerated.

Stability

Specimen Type Temperature Time
CSF RT

≤ 4 h
CSF

2-8 C

≤ 2 w
CSF

-20 C or -70 C

≤ 1 y

Availability

STAT Performed TAT
Y 24/7 1 h

Performing Laboratory

Seattle Children's Laboratory    

Department

Department: Core Chemistry

Phone Number: 206-987-2617 (Client Services)

CPT Codes

80204

Methodology

Method: Enzyme immunoassay by Vitros 4600

Analytical Volume:  0.150 mL CSF

Reference Range

Contact Chemistry (206) 987-2565 for expected levels.