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Use our free PTH Level Calculator to calculate PFI, corrected calcium, and interpret PTH results instantly with accurate formulas and easy steps.
| Serum Calcium | PTH | Interpretation |
|---|---|---|
| High | High | Strongly suggests primary hyperparathyroidism |
| High | Normal (not suppressed) | Inappropriately normal; still suspicious for primary hyperparathyroidism |
| High | Low | Suggests non–PTH-mediated hypercalcemia (e.g. malignancy) |
| Low | High | Consistent with secondary hyperparathyroidism (e.g. vitamin D deficiency, CKD) |
| Low | Normal/Low | Possible hypoparathyroidism or PTH resistance |
| Calculation | Formula |
|---|---|
| Parathyroid Function Index (PFI) | (Calcium mmol/L × PTH pg/mL) ÷ Phosphorus mmol/L |
| Albumin-Corrected Calcium | Measured Calcium + 0.8 × (4 − Albumin) |
A PTH Level Calculator helps you understand your parathyroid hormone results. It also checks how PTH works with calcium, phosphorus, and albumin, which can be further evaluated using a Calcium and Albumin Calculator. Our calculator makes these calculations fast and simple.
Keep in mind that a PTH level is not calculated. A lab measures it through a blood test. Our tool uses your measured PTH value with proven medical formulas. It then provides helpful calculations and an easy-to-read interpretation.
Whether you are a student, patient, or healthcare worker, this calculator saves time. It also reduces manual math and lowers the chance of errors.
A PTH Level Calculator is an online tool that works with a measured parathyroid hormone value. It calculates important results that doctors often review with PTH.
The calculator includes three useful functions. It calculates the Parathyroid Function Index (PFI). It calculates albumin-corrected calcium. It also compares calcium and PTH to show a clinical interpretation.
This makes it much easier to understand laboratory results.
Parathyroid hormone helps control calcium in your body. It also affects phosphorus and vitamin D. Healthy PTH levels help keep your bones, muscles, nerves, and kidneys working well.
A high or low PTH level may point to a medical problem, such as hyperparathyroidism, which can be assessed using a Hyperparathyroidism Calculator. Your doctor always reviews PTH with other blood tests before making a diagnosis.
Our calculator uses three evidence-based formulas.
Parathyroid Function Index (PFI)
PFI = (Serum Calcium × PTH) ÷ Serum Phosphorus
Where:
Albumin Corrected Calcium Formula
Corrected Calcium = Measured Calcium + 0.8 × (4 − Albumin)
Where:
Clinical Interpretation
The calculator compares corrected calcium with measured PTH. It then classifies the result into common clinical patterns such as primary hyperparathyroidism, secondary hyperparathyroidism, possible hypoparathyroidism, or normal findings.
Remember that PTH itself cannot be calculated. A laboratory must measure it.
Using the calculator takes only a minute.
The calculator instantly shows your result. It also explains what the values may mean.
Suppose your lab reports these values.
Serum Calcium = 2.45 mmol/L
PTH = 82 pg/mL
Serum Phosphorus = 0.90 mmol/L
Step 1
Multiply calcium by PTH.
2.45 × 82 = 200.90
Step 2
Divide by phosphorus.
200.90 ÷ 0.90 = 223.22
Result
PFI = 223.22
The calculator also explains whether the value is above or below the proposed reference cutoff. This result should always be reviewed with your doctor.
A normal PTH range depends on the laboratory. Many labs use about 15 to 65 pg/mL.
A high PTH level may suggest:
Doctors never use PTH alone. They also check calcium, phosphorus, vitamin D, kidney function, and your symptoms.
Yes. It often does.
When vitamin D drops, your body absorbs less calcium. Your parathyroid glands respond by making more PTH. This is called secondary hyperparathyroidism.
Many people see their PTH return to normal after treating vitamin D deficiency. Your healthcare provider can confirm the cause with blood tests.
Parathyroid tumors are uncommon.
Most people with primary hyperparathyroidism have a single benign parathyroid adenoma. Cancer of the parathyroid gland is very rare.
Early testing helps doctors find the cause before serious problems develop.
Some laboratories report PTH in pmol/L instead of pg/mL.
The normal range depends on the testing method used by the laboratory.
Always compare your result with the reference range shown on your lab report. Your healthcare provider will explain what the result means for you.
Our calculator is fast and easy.
It follows accepted medical formulas.
It shows every calculation step.
It explains the result in plain language.
It works on desktop and mobile devices.
It helps reduce manual calculation errors.
It is useful for patients, students, researchers, and healthcare professionals.
Our PTH Level Calculator makes complex laboratory calculations simple. It calculates the Parathyroid Function Index, corrected calcium, and clinical interpretation in seconds. The results are easy to read and understand.
Remember that the calculator does not diagnose disease. A laboratory must measure PTH directly. Always discuss your results with a qualified healthcare professional, especially if your calcium or PTH levels fall outside the normal range.
A PTH Level Calculator uses your measured PTH value with calcium, phosphorus, or albumin to calculate PFI, corrected calcium, and clinical interpretation.
No. A laboratory measures PTH through a blood test. The calculator uses that measured value in evidence-based formulas.
Many laboratories use a normal range of about 15 to 65 pg/mL. Results outside this range need medical review with other blood tests.
Yes. Low vitamin D often raises PTH because your body tries to keep calcium levels normal.
Most parathyroid tumors are benign adenomas. Parathyroid cancer is very rare.
The normal range varies by laboratory and testing method. Always use the reference range printed on your lab report.
Yes. The calculator follows published medical formulas for PFI and corrected calcium. It also uses accepted calcium and PTH interpretation patterns. However, it cannot replace professional medical advice.
Yes. You can use it anytime if you already have your laboratory test results. Always discuss abnormal results with your healthcare provider.