METHOTREXATE BLOOD (MTX)
: 0-150yrs: 24hr post infusion < 5.0 micromol/L; 48 hrs post infusion <0.50 micromol/L; 72 hrs post infusion <0.10 micromol/L
: Dark green top (Sodium Heparin)
: Red top (no gel)
: 1 dark green microtainer
: 1 mL
: 0.5 mL
: Refrigerated if not delivered to the lab immediately after collection.
: Refrigerated: 2 days, frozen at -20 C for longer storage
Reasons for Rejection
: Improper collection
: Stat: 1 hour, routine: 2 hours
: Send to the lab immediately at room temperature. Refrigerate specimen if it cannot be delivered to the lab immediately.This test should not be used in patients given Glucarpidase (Carboxypeptidase G2) rescue.
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