Calcitriol 1,25-Dihydroxyvitamin D

Quest Diagnostics

Sample type: Serum

Requires fasting: No

Phlebotomy required

Details

This test checks the active form of vitamin D in the body. It's mainly used to help figure out why a person has low calcium levels and to keep an eye on people with bone problems due to kidney disease or those with chronic kidney failure.

Biomarker summary

Vitamin D, 1,25 (OH)2, TOTAL
Vitamin D2, 1,25 (OH)2
Vitamin D3, 1,25 (OH)2

Additional details

Estimated days for results: Results should be available in 2 - 5 business days after the sample is collected

Details

Calcitriol 1,25-Dihydroxyvitamin D Test - This test checks the active form of vitamin D in your body. It's mainly used to help figure out why someone has low calcium levels and to keep an eye on people with bone problems due to kidney disease or those with chronic kidney failure. However, it's not the right test for finding out if you're low on vitamin D or for tracking how well vitamin D supplements are working. For those needs, the 25-hydroxyvitamin D test is recommended.

What patients is this test right for?

This test is particularly useful for individuals experiencing symptoms of low calcium or those being treated for renal osteodystrophy or chronic renal failure.

What type of sample is required for this test?

0.6 mL serum is needed for this test.

Test Resources

For more detailed information, it's suggested to refer to the New England Journal of Medicine article from 2007 (Volume 357, pages 266-281).

Average sample processing time

2–5 business days

Reference range

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

Reference ranges are established for total 1,25-dihydroxy vitamin D. Values for subcomponents D2 (derived from plant or fungal sources) and D3 (derived from human or animal sources) are provided for informational purposes only.

Health categories

Patient instructions

Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:

Quest Diagnostics Patient Service Centers (PSC)

Location: Visit a nearby Quest Diagnostics Patient Service Center.
Cost: $10 sample collection fee (paid during lab order checkout).
Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 10 minutes before your appointment.
Collection Instructions:

Bring a valid ID.
Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.

Check-in: Scan the QR code from your confirmation email or follow kiosk instructions.
More Info: Quest Diagnostics blood draw guide

Getlabs Mobile Phlebotomy

Location: Sample collection at your home or office.
Cost: $85 sample collection fee (paid during lab order checkout).
Availability: Available in most locations – enter your ZIP code during checkout to confirm.
Scheduling: Schedule your appointment here through your Fullscript account.
Collection Instructions: