Total reviews 420
Total reviews 420
Tests Included: 8
Est. 5-7 (business days) Turnaround
Specimen type: Blood
Quest Diagnostics Location
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.
Tests Included: 8
Est. 5-7 (business days) Turnaround
Specimen type: Blood
Quest Diagnostics Location
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Please do not exercise prior to testing. It is best that your blood is taken in a rested state.
Note: Turn around times on results are an estimate and are not guaranteed. The lab may need additional time due to holidays, confirmation/repeat testing, etc. You can contact us to discuss when your results should be ready and we will contact the lab on your behalf immediately.
QuestAssureD™ 25-Hydroxyvitamin D (D2, D3)
| Vitamin D, 25-OH, Total | 30-100 ng/mL |
25-OHD3 indicates both endogenous production and supplementation. 25-OHD2 is an indicator of exogenous sources, such as diet or supplementation. Therapy is based on measurement of Total 25-OHD, with levels <20 ng/mL indicative of Vitamin D deficiency, while levels between 20 ng/mL and 30 ng/mL suggest insufficiency. Optimal levels are ≥30 ng/mL.
| Vitamin D, 25-OH, D3 | Not established |
| Vitamin D, 25-OH, D2 | Not established |
Vitamin D, 1,25-Dihydroxy
| Vitamin D, 1,25 (OH)2, Total | ||
| 1-9 Years | 31-87 pg/mL | |
| 10-13 Years | 30-83 pg/mL | |
| 14-17 Years | 19-83 pg/mL | |
| Adult | 18-72 pg/mL | |
| Vitamin D3, 1,25 (OH)2 | Not available | |
| Vitamin D2, 1,25 (OH)2 | Not available | |
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