Cardio IQ® Vitamin D, 25‑Hydroxy

Casandra

Casandra Test Code QD29483Version 1 (DRAFT)

Performing Lab

Lab Quest DiagnosticsLab Test ID 91735CPT Code 82306

Cardio IQ® Vitamin D, 25‑Hydroxy

Also known as: CardioIQ®, Vitamin D, 25-Hydroxy, LC/MS/MS, Cardio IQ®

Clinical Use

Order Test

Use

At low levels, vitamin D (25‑Hydroxy) is associated with increased risk of cardiovascular events and death due to heart failure, sudden cardiac death, and stroke. These cardiovascular effects are mediated via activation of the renin‑angiotensin‑aldosterone system and increased parathyroid hormone, which contribute to insulin resistance, hypertension, inflammation, and heightened cardiovascular risk ([questdiagnostics.com](https://www.questdiagnostics.com/healthcare-professionals/about-our-tests/cardiovascular/cvd-test-descriptions?utm_source=openai)).

Special Instructions

Not provided.

Limitations

Not provided.

Test Details

Methodology

Mass Spectrometry

Biomarkers

Vitamin D, 25‑OH, D2

Analyte

Quantitation • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Vitamin D, 25‑OH, D3

Analyte

Quantitation • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Vitamin D, 25‑OH, Total

Analyte

Quantitation • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Result Turnaround Time

2-4 days

Specimen

Serum

Volume

0.5 mL

Minimum Volume

0.3 mL

Container

Red Top (No Additive)

Collection Instructions

Fasting is preferred but not required. Gently invert 5X (Do not shake!). Let blood clot for 30 min at room temperature. Centrifuge for 10 min.

Patient Preparation

Fasting preferred, but not required.

Causes for Rejection

Gross hemolysis; grossly lipemic; heparinized or EDTA plasma; grossly icteric; specimens other than serum; improper labeling; samples older than stability limits; samples not stored properly