At LabCorp, Thyroid-stimulating Hormone (TSH) and Free T4 is drawn in a Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma., order code 224576.

LabCorp collection requirements

Thyroid-stimulating Hormone (TSH) and Free T4 tube and order code at LabCorp

Primary tube

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma.

Order code

224576

Minimum volume

0.7 mL (Note: This volume does not allow for repeat testing.)