Calcium, Ionized is drawn in a Gel barrier tube, SST at Quest, a Gel-barrier tube at LabCorp, and a SST Tube at BioReference.
Lab comparison
Calcium, Ionized: Quest vs LabCorp vs BioReference, tube, code & requirements
. This page shows collection requirements for all three major reference labs in one view, so you don’t have to cross-check three portals.
Always verify against your lab’s current collection manual before drawing.
Every value on this page is verified by a nurse practitioner in active clinical practice, not scraped from an automated source.
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| Requirement | Quest Diagnostics | LabCorp | BioReference |
|---|---|---|---|
| Test code | 306 | 004804 | 0051-3 |
| Primary tube | Gel barrier tube, SST | Gel-barrier tube | SST Tube |
| Specimen type | 2 mL serum collected in a gel barrier tube | Serum | 3 mL SST Tube |
| Patient prep | None Specified | None Specified | None Specified |
| Minimum volume | Minimum volume 0.6 mL | Volume 1 mL | Qty 1 |
Frequently asked questions
What is the Quest Diagnostics order code for Calcium, Ionized?
The Quest Diagnostics order code for Calcium, Ionized is 306.
What tube color does LabCorp use for Calcium, Ionized?
LabCorp uses a Gel-barrier tube for Calcium, Ionized.
Does Calcium, Ionized require fasting?
Calcium, Ionized patient prep: None Specified. Always confirm with the ordering lab before the draw.
Data provenance
Source: Quest Diagnostics specimen collection manual, LabCorp directory of services, and BioReference laboratory collection guide.
Verified by: a licensed nurse practitioner in active clinical practice. Values are reviewed against each lab’s published collection requirements. Always confirm against your lab’s current manual before drawing.
Quest verified by: Mandi Boss B Franklin, Aug 29, 2026
LabCorp verified by: Mandi Boss B Franklin, Aug 29, 2026
BioReference verified by: Mandi Boss B Franklin, Aug 29, 2026
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No login · Zero PHI · Clinician-verified · Quest + LabCorp + BioReference.
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