Ordering Guidance

For patients that have received glucarpidase (carboxypeptidase G2) as a high-dose methotrexate rescue therapy, order MTXSG / Methotrexate Post Glucarpidase, Serum.

Shipping Instructions

Ship specimen in amber vial to protect from light.

Specimen Required

Supplies: Sarstedt 5 mL Aliquot Tube (Amber) (T915)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Amber vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Methotrexate is sensitive to fluorescent light; avoid prolonged exposure of specimen to direct light.

2. Serum gel tubes should be centrifuged within 2 hours of collection. Protect from light.

3. Red-top tubes should be centrifuged and serum aliquoted into amber vial within 2 hours of collection.