Laboratory test
PO4 Test (Serum Phosphorus)
Phosphorus (PO4): 1 parameter from a blood sample, no fasting.
Also known as
PO4 Test · Serum Phosphorus · Phosphorus Test · Phosphate Test · Serum Phosphate · Inorganic Phosphorus · PO4 Blood Test · Serum Phosphorus Test
- Sample
- Blood
- Fasting
- Not required
- Expected report time
- Same day / 24 hours
- Parameters
- 1
- No home collection fee
PO4 Test: quick answers
- PO4 Test full form
- Serum Phosphorus
- PO4 Test price
- ₹179, home sample collection
- Normal range (adults)
- Adults: 2.5–4.5 mg/dL
- Done for
- Kidney disease, where phosphorus tends to rise; Checking calcium and parathyroid problems, usually with calcium and PTH; Bone pain, weak bones or rickets and osteomalacia
- Fasting
- Not required
- Report
- Same day / 24 hours
What is the PO4 Test?
The PO4 test measures phosphate (phosphorus) in your blood. PO4 is the chemical formula of phosphate. Phosphorus works with calcium to build bones and teeth and helps cells make energy, and the kidneys keep its level steady.
PO4 Test normal range
| Measurement | Typical adult value |
|---|---|
| Adults | 2.5–4.5 mg/dL |
Children have higher values than adults, and levels are a little lower after meals and higher in the morning fasting state in some people. Methods differ between labs, so go by the range on your report.
Ranges differ between laboratories and methods. The reference range printed on your own report is the one to read your result against.
What your PO4 Test result means
- High
- Most often kidney disease, because the kidneys stop clearing phosphate. Low parathyroid hormone, excess vitamin D, and cell breakdown can also raise it. Over time a high level harms bones and blood vessels.
- Low
- Can come from vitamin D deficiency, an overactive parathyroid, poor diet or absorption, alcohol excess, or from some antacids. Very low levels cause muscle weakness and tiredness.
One result is not a diagnosis. A doctor reads it with your symptoms, history, medicines and other tests.
Why is the PO4 Test done?
- Kidney disease, where phosphorus tends to rise
- Checking calcium and parathyroid problems, usually with calcium and PTH
- Bone pain, weak bones or rickets and osteomalacia
- Monitoring people on dialysis, or on phosphate binders or supplements
What does the PO4 Test (Serum Phosphorus) measure?
1 parameter. Expand a group to see the measurements, units and available method details.
Other measurements1 parameter
| Parameter | Unit | Catalogue method | LOINC |
|---|---|---|---|
| Phosphorus (Inorganic) | mg/dL | Phosphomolybdate | 2777-1 |
The reference interval printed on your actual laboratory report governs interpretation. Intervals can vary by laboratory, method, age, sex and pregnancy. Methods can also vary by processing laboratory.
PO4 Test: sample & preparation
Sample: Blood. Fasting: Not required.
- You do not need to fast for this blood test.
Frequently asked questions
What is the full form of PO4 in a blood test?
What is a normal phosphorus level in the blood?
Is PO4 the same as phosphorus?
Do I need to fast for the phosphorus test?
Why is phosphorus tested with calcium?
How much does the Phosphorus (PO4) cost?
Can I book this test for home collection?
When is the report expected?
Can I book this with other tests?
Sources: Tietz Textbook of Laboratory Medicine, 7th edition, 2022; Harrison's Principles of Internal Medicine, 21st edition, 2022; KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD. General information, not medical advice.
Book the PO4 Test (Serum Phosphorus)
1 parameter · No fasting required · Report time: Same day / 24 hours
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