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Vitamin D Analog (Prescribed) Level, Oral

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of a prescribed vitamin D analog (a synthetic form of vitamin D) in your blood after oral administration. It helps monitor your response to this medication.

Quick summary

["This test checks how well your body absorbs and uses the prescribed vitamin D analog."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
72030-0
Short code
TYPEORALVITAMINDANALOGPRESCRIBED
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
30
Ref high
100
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
esrd
CPT
86038
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you are taking an oral vitamin D analog for conditions like osteoporosis, hypoparathyroidism, or other metabolic bone diseases. It helps ensure the medication is working as intended and adjusts your dose if needed.

What to Expect Before the Test

No special preparation is typically required. You may be asked to fast for a few hours before the test, depending on the lab’s instructions. Bring any medications or supplements you’re currently taking to your appointment.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. The process is quick and usually causes only mild discomfort. The blood sample will be sent to a lab for analysis.

What the Results Mean

Results are compared to a reference range specific to the vitamin D analog being tested. Low levels may indicate poor absorption or ineffective medication, while high levels could signal overuse or kidney issues. Your provider will interpret results in the context of your overall health.

Reference range

NCBI: Vitamin D 30-100 ng/mL (sufficient)N/A

Specimen: serum

Fasting for 8-12 hours preferred for some tests. Inform about supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring Medication Effectiveness and Side Effects

Short name

Vitamin D Analog (Oral)

Frequently asked questions

How often should I expect this test?
Your provider will determine the timing based on your treatment plan. Some patients may need testing every few weeks to months to adjust doses, while others may only need it periodically.
What if my results are outside the expected range?
If your results are low, your provider may increase your dose or check for underlying issues like malabsorption. If results are high, they may reduce your dose or investigate potential side effects like kidney strain.
Can I take my vitamin D analog with food?
Yes, most oral vitamin D analogs are taken with food to improve absorption. However, always follow your provider’s specific instructions, as some formulations may require timing around meals.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy