Vitamin D 1,25-Dihydroxy
The Vitamin D 1,25-Dihydroxy Test measures calcitriol, the active form of Vitamin D, to assess calcium balance and metabolic function.About Test
The Vitamin D 1,25-Dihydroxy Test measures the level of calcitriol, the active form of Vitamin D, in your blood. This form of Vitamin D is produced in the kidneys from 25-hydroxy Vitamin D and plays a crucial role in calcium regulation and bone metabolism.
Unlike the standard Vitamin D test (25-hydroxy Vitamin D), which reflects overall Vitamin D stores, this test evaluates how well your body is converting Vitamin D into its active form.
This test is typically used in specific clinical situations such as kidney disorders, parathyroid gland abnormalities, or certain metabolic bone diseases. It is not commonly used for routine Vitamin D deficiency screening.
By measuring active Vitamin D levels, doctors can better understand disorders affecting calcium balance and Vitamin D metabolism.
Why This Test
This test is used to evaluate specific medical conditions affecting Vitamin D metabolism.
Assess Kidney Function
The kidneys convert Vitamin D into its active form. This test helps detect kidney-related disorders.
Evaluate Parathyroid Disorders
Helps diagnose conditions related to abnormal parathyroid hormone (PTH) levels.
Investigate Calcium Imbalance
Used when calcium levels are abnormal despite normal Vitamin D levels.
Diagnose Rare Metabolic Conditions
Helps identify conditions affecting Vitamin D activation and metabolism.
Monitor Chronic Diseases
Used in patients with kidney disease, bone disorders, or hormonal imbalances.
Who Should Take
This test is recommended only in specific medical conditions and under medical supervision.
You may need this test if you have:
- Chronic kidney disease
- Abnormal calcium or phosphorus levels
- Parathyroid gland disorders
- Unexplained bone disorders
This test is usually advised by a doctor and is not part of routine health screening.
Preparation
No special preparation is usually required before taking this test.
Fasting Requirement
Fasting is not required.
Best Time for the Test
The test can be performed at any time during the day.
Medications
Inform your doctor about any Vitamin D supplements or medications, as they may influence results.
Parameters
- 1
- 25-Dihydroxy Vitamin D (Calcitriol)