Vitamin D, 1, 25 - Dihydroxy Test: Booking, Price, and Results
About Vitamin D, 1, 25 - Dihydroxy Test
| Field | Value |
|---|---|
| Also Known As | Calcitriol test, 1,25(OH)₂D, 1,25-Dihydroxycholecalciferol, Active Vitamin D test, DHVD test |
| Sample Type | Serum (venous blood) |
| Fasting Required | 4-hour fast preferred, but not required |
| Report Time | 4 days |
| Recommended For | All genders and ages, as advised by a healthcare provider |
| Price | Starting at ₹3,200 |
What is a Vitamin D, 1, 25 - Dihydroxy Test?
The Vitamin D, 1, 25 - Dihydroxy test measures calcitriol, the biologically active form of vitamin D in the body. Unlike the standard vitamin D blood test, this test focuses specifically on the hormonal form that regulates calcium and phosphate levels.
A doctor may order this test to investigate kidney disease, bone disorders, or conditions such as sarcoidosis. A small blood sample drawn from a vein in your arm is all that is needed.
What Does a Vitamin D, 1, 25 - Dihydroxy Test Measure?
This test measures a single, specific compound. Here is what it tells your doctor:
| Parameter | What it Reflects |
|---|---|
| 1,25-Dihydroxyvitamin D (Calcitriol) | The active hormonal form of vitamin D, produced mainly in the kidneys. It controls how the body absorbs calcium and phosphate, supporting bone strength, muscle function, and nerve transmission. |
Calcitriol is formed from 25-hydroxyvitamin D through a conversion process in the kidneys, controlled by parathyroid hormone (PTH). Measuring it directly helps identify problems with this conversion process.
Why is a Vitamin D, 1, 25 - Dihydroxy Test Done?
This test is ordered when a doctor needs to understand how the body is processing and activating vitamin D, not simply how much vitamin D is stored. It is especially useful for specific medical situations rather than routine screening.
Common Symptoms That May Require This Test
Your doctor may recommend this test if you are experiencing any of the following symptoms:
- Bone pain or tenderness
- Unexplained muscle weakness
- Persistent fatigue
- Unexplained fractures or fragile bones
- Kidney stones
- Numbness or tingling in the limbs
Conditions This Test Can Help Detect
This test can help evaluate or identify several conditions, including:
- High blood calcium (hypercalcaemia) and its underlying cause
- Chronic kidney failure, which impairs calcitriol production
- Vitamin D-dependent rickets in children, caused by a hereditary enzyme deficiency
- Primary hyperparathyroidism (overactive parathyroid glands)
- Granulomatous diseases such as sarcoidosis or tuberculosis, where immune cells produce calcitriol outside normal regulation
- Certain lymphomas or excessive vitamin D supplementation can cause toxicity
Vitamin D, 1, 25 - Dihydroxy Test for Chronic Disease Monitoring
This test plays a useful role in monitoring patients with chronic kidney failure. As kidney function declines, calcitriol levels fall, often even in the early stages of the disease.
For patients receiving calcitriol supplementation, serial testing can help track whether treatment is achieving the desired effect.
How to Prepare and What to Expect
Preparation for this test is straightforward. Your doctor will advise you based on your specific health situation.
Do You Need to Fast?
Fasting for 4 hours before the test is preferred, but it is not strictly required. If your doctor has ordered other tests alongside this one, those may have their own fasting requirements, so confirm with your healthcare provider.
Practical Tips Before Your Test
A few simple steps will help ensure your sample is collected smoothly and accurately:
- Bring a detailed clinical history, including your symptoms, previous test results, and family history, as this is required for the test.
- Tell your doctor about all medications and supplements you are taking, including vitamin D, calcium supplements, corticosteroids, anticonvulsants, and diuretics.
- Do not receive any radioactive isotope-based medications or injections within 24 hours before sample collection, as these can interfere with results.
- Wear loose, comfortable clothing that gives easy access to the arm.
- Stay well hydrated before your appointment.
Step-by-Step Procedure
The blood collection process is quick and causes minimal discomfort. Here is what to expect:
- A trained phlebotomist cleans a small area on your arm with an antiseptic wipe.
- A fine needle is gently inserted into a vein, usually in the crook of the elbow, and a small blood sample (approximately 3 ml) is drawn.
- The blood is collected into a yellow-top serum separator tube (SST gel tube).
- The needle is removed, and light pressure is applied to the site for a minute or two.
- The sample is allowed to clot, then centrifuged so the serum is separated from the blood cells. It is kept refrigerated (2 to 8 degrees Celsius) and protected from light during transit.
- The sample is dispatched to the laboratory for analysis using the EIA (enzyme immunoassay) method.
Factors That Can Affect Accuracy
Several factors can influence your calcitriol result. Be sure to mention these to your doctor:
- Recent use of vitamin D or calcium supplements
- Current kidney function and parathyroid hormone levels
- Medications such as corticosteroids or anticonvulsants
- Improper sample handling or light exposure during transit
- Dehydration at the time of collection
Understanding Your Vitamin D, 1, 25 - Dihydroxy Test Results
Your results should always be reviewed together with your doctor, who will consider your full medical history and other test findings. The table below shows general reference ranges for context.
| Parameter | Group | Normal Range | Unit |
|---|---|---|---|
| 1,25-Dihydroxyvitamin D | Adults | 18 to 72 | pg/mL |
| 1,25-Dihydroxyvitamin D | Children (13 months to 16 years) | 18 to 87 (range varies as per the age of the child) | pg/mL |
Note: Children generally have higher values than adults. Reference ranges may differ slightly between laboratories.
Disclaimer: These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain health states can shift calcitriol levels in predictable ways. Your doctor will take these into account:
- During pregnancy, calcitriol levels rise to two to three times their baseline value by around 12 weeks of gestation. This is a normal physiological change and does not indicate toxicity.
- In chronic kidney disease, reduced kidney enzyme activity lowers calcitriol production. The more advanced the kidney disease, the more pronounced the decline.
- In sarcoidosis and other granulomatous conditions, immune cells called macrophages produce calcitriol independently of the kidney's normal regulatory controls, causing levels to rise.
How to Maintain Healthy Levels
These general wellness tips support the body's vitamin D system:
- Get regular, moderate sunlight exposure and include vitamin D-rich foods in your diet. Supplements should only be taken as advised by a doctor.
- Eat adequate calcium-containing foods such as dairy products, leafy greens, and fortified foods to support the calcium regulation that calcitriol manages.
- Attend regular health check-ups, particularly if you have kidney disease, bone disorders, or a history of granulomatous conditions.
Lupin Diagnostics Vitamin D, 1, 25 - Dihydroxy Test Price and Home Collection
The Vitamin D, 1, 25 - Dihydroxy test cost at Lupin Diagnostics starts at ₹3,200, with home sample collection available across cities. The approximate prices across major Indian cities are listed below for reference.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 3200 |
| CHENNAI | 3200 |
| HYDERABAD | 3200 |
| KOLKATA | 3200 |
| NAVI MUMBAI | 3200 |
| PUNE | 3200 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
Home Collection
Lupin Diagnostics offers Vitamin D, 1, 25 - Dihydroxy test home collection across multiple cities.
A certified phlebotomist visits your home at your scheduled time, collects the blood sample, and ensures it is dispatched to the laboratory under appropriate storage conditions. All samples are processed in NABL-accredited laboratories, and your digital report is accessible within the turnaround period.
How to Book
Vitamin D, 1, 25 - Dihydroxy test online booking is simple:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
The standard vitamin D test (25-hydroxy) measures the body's vitamin D stores and is the preferred test for diagnosing deficiency. The Vitamin D, 1, 25 - Dihydroxy test measures the active hormonal form and is used when kidney disease, sarcoidosis, or conditions producing excess vitamin D are suspected. The two tests answer different clinical questions.
No, this test is not designed to diagnose vitamin D deficiency. A normal or even high calcitriol result does not rule out low vitamin D stores. The 25-hydroxyvitamin D test is the recommended test for detecting deficiency.
The kidneys carry out the final step in converting vitamin D into its active form, calcitriol. When kidney function declines, this conversion is impaired, and calcitriol levels fall. Monitoring these levels helps doctors manage calcium balance and treatment in patients with kidney disease.
A high calcitriol level may indicate conditions such as primary hyperparathyroidism, sarcoidosis, tuberculosis, or certain lymphomas, where calcitriol is produced outside the kidney's normal control. Excessive vitamin D supplementation can also raise levels. Your doctor will interpret the result alongside other investigations.
You should not stop any supplements or medications without first speaking to your doctor. However, it is important to disclose all supplements and medications you are taking, as they can influence your calcitriol level and how results are interpreted.
At Lupin Diagnostics, the report is delivered within 4 days. The Vitamin D, 1, 25 - Dihydroxy test procedure involves specialised analysis, which is why the turnaround time is longer than routine blood tests.
Yes. Calcitriol levels naturally rise to two to three times their pre-pregnancy baseline by around 12 weeks of gestation. This is a normal adaptation that supports increased calcium absorption during pregnancy. Your doctor will interpret results with this physiological change in mind.
Vitamin D, 1, 25 - Dihydroxy Test: Booking, Price, and Results
