QuestAssureD 25-Hydroxy and Calcitriol 1,25-Dihydroxyvitamin D Blood Test
Compare labs
| Feature |
Labcorp
|
Quest Diagnostics
|
|---|---|---|
| Price | Coming soon | $63.49 |
| Results in | — | ~5 business days |
| Sample type | — | Blood Serum |
| Require fasting | — | No |
About the test
Vitamin D originating from dietary and endogenous sources is converted to 25-hydroxyvitamin D in the liver, and subsequently to 1, 25-dihydroxyvitamin D in the kidney. Measurement of both the 1, 25-Dihydroxy and 25-Hydroxy forms provide insights into a variety of medical conditions such Vitamin D status in renal failure, differential diagnosis of primary, secondary and tertiary hyperparathyroidism. Differential diagnosis of hypercalcemia and type I and II inherited rickets.
Included biomarkers & Reference ranges
| Biomarker | Reference range |
|---|---|
| Vitamin D, 25-OH, Total The combined measure of both major forms of vitamin D (D2 and D3) in your blood — the standard test used to assess overall vitamin D status. | 30–100 ng/mL |
| Calcitriol (1,25 di-OH Vitamin D) The active, hormone form of vitamin D that directly regulates calcium absorption. Tested less often than 25-OH vitamin D, mainly for kidney or calcium-regulation disorders. | 18–72 pg/mL |
| 25-OH Hydroxy Vitamin D (Cholecalciferol D3) The vitamin D3 portion of your 25-hydroxyvitamin D, coming from sunlight on your skin, animal foods and most supplements, used to assess vitamin D status. | — |
| 25-OH Hydroxy Vitamin D (Ergocalciferol D2) The vitamin D2 portion of your 25-hydroxyvitamin D, which comes mainly from plant-based sources and prescription or some over-the-counter supplements. | — |
| Vitamin D2, 1,25 (OH)2 Measures the active, hormone form of vitamin D made from vitamin D2, reported as part of a total 1,25-dihydroxyvitamin D (calcitriol) result. | — |
| Vitamin D3, 1,25 (OH)2 Measures the active, hormone form of vitamin D made from vitamin D3, reported as part of a total 1,25-dihydroxyvitamin D (calcitriol) result. | — |
Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.
Preparation
- Fasting for 8 hours before your blood draw is recommended but not required.
- Fasting before a blood draw means you don't eat or drink anything except water.
- Your doctor should provide any special instructions related to fasting for your test. Always follow your doctor's instructions.
How it works
- 1. Order online No referral or insurance
- 2. Get a requisition By email in 24–72 hours
- 3. Visit a draw center Bring a matching photo ID
- 4. Get results Securely by email
- These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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