Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, green-top (heparin) tube, or gray-top (sodium fluoride) tube. Plasma specimens may not be less than one-half full as excess anticoagulant may cause improper results.
To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
• Serum: Refrigerate up to five days; freeze to store for more than five days.
• Plasma: Refrigerate and test within 48 hours; do not freeze.