Vitamin D Analog (Prescribed Medication) Level
This test measures the level of a synthetic vitamin D analog prescribed to help maintain vitamin D levels in your body.
Your prescribed vitamin D analog helps regulate calcium and bone health; this test checks how well it’s working.
Key facts at a glance
- LOINC
- 72031-8
- Short code
- ORALVITAMINDANALOGPRESCRIBED
- 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 to monitor your response to a prescribed vitamin D analog. It helps ensure the medication is maintaining your vitamin D levels within a safe range and preventing potential side effects or deficiencies.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The process is quick and typically done in a clinic or lab setting.
What the Results Mean
Results will show the concentration of your prescribed vitamin D analog in your blood. While reference ranges vary by lab, lower-than-expected levels may indicate insufficient absorption or metabolism, while higher levels could signal overuse or kidney/liver issues. Your provider will discuss these findings with you.
Common Causes for Testing
This test is often done if you’re on long-term vitamin D analog therapy, have symptoms like bone pain, muscle weakness, or frequent infections, or if your provider wants to adjust your dose.
Reference range
NCBI: Vitamin D 30-100 ng/mL (sufficient)N/A
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.
Vitamin D analogs are used to treat or prevent conditions like rickets, osteoporosis, or hypoparathyroidism. Regular monitoring helps prevent complications like hypercalcemia (high blood calcium) or vitamin D toxicity, which can cause nausea, kidney stones, or weakness. Your provider may adjust your medication based on these results to optimize safety and effectiveness.
Short name
Vitamin D Analog Monitoring
Frequently asked questions
How often should I expect this test?
What happens if my levels are too high?
Can I eat or drink before the blood draw?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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