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Use our free Hyperparathyroidism Calculator to calculate corrected calcium, CCCR, and FECa instantly with formulas, steps, examples, and accurate results.
| 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) |
| Metric | Threshold | Suggests |
|---|---|---|
| CCCR | < 0.01 | Familial Hypocalciuric Hypercalcemia (FHH) |
| 0.01 – 0.02 | Indeterminate; interpret with clinical context | |
| > 0.02 | Primary Hyperparathyroidism | |
| FECa | < 1% | May support FHH |
| 1% – 2% | Borderline / Indeterminate | |
| > 2% | More consistent with Primary Hyperparathyroidism |
| Calculation | Formula |
|---|---|
| Corrected Calcium (mg/dL) | Ca + 0.8 × (4 − Albumin) |
| Corrected Calcium (mmol/L) | Ca + 0.02 × (40 − Albumin) |
| CCCR | (Serum Ca × Urine Cr) ÷ (Urine Ca × Serum Cr) |
| FECa | [(Serum Ca × Urine Cr) ÷ (Urine Ca × Serum Cr)] × 100 |
A Hyperparathyroidism Calculator helps you review important lab values with ease. It does not diagnose a disease. Instead, it performs trusted medical calculations used during the evaluation of hyperparathyroidism.
Our calculator combines three useful tools in one place. It calculates corrected calcium, the calcium-to-creatinine clearance ratio (CCCR), and the fractional excretion of calcium (FECa). These results can help doctors and patients better understand calcium balance before making clinical decisions.
The calculator is simple to use. Enter your laboratory values. Click the calculate button. You will receive the result with a full calculation and an easy explanation.
Whether you are a student, healthcare worker, or patient, this calculator saves time and reduces manual errors.
Hyperparathyroidism happens when one or more parathyroid glands make too much parathyroid hormone (PTH). High PTH raises calcium levels in the blood. Over time, this may affect your bones, kidneys, muscles, and nerves.
Doctors do not diagnose hyperparathyroidism with one formula. They compare several laboratory tests, especially calcium and PTH levels. Our calculator supports this process by performing common evidence-based calculations.
Manual calculations can take time. They also increase the chance of mistakes.
Our calculator performs the math instantly.
It helps you:
Check corrected calcium.
Calculate the calcium-to-creatinine clearance ratio.
Calculate the fractional excretion of calcium.
View every calculation step.
Understand the result with clear explanations.
Use both conventional and SI units.
There is no single formula that diagnoses hyperparathyroidism. However, these calculations are widely used during clinical evaluation.
Corrected Calcium Formula (mg/dL)
Corrected Calcium = Measured Calcium + 0.8 × (4 − Serum Albumin)
Where:
Measured Calcium = Serum calcium in mg/dL
Serum Albumin = g/dL
4 = Standard albumin value
Corrected Calcium Formula (SI Units)
Corrected Calcium = Measured Calcium + 0.02 × (40 − Serum Albumin)
Where:
Measured Calcium = mmol/L
Serum Albumin = g/L
40 = Standard albumin value
Calcium-to-Creatinine Clearance Ratio (CCCR)
CCCR = (Urine Calcium × Serum Creatinine) ÷ (Serum Calcium × Urine Creatinine)
This calculation helps distinguish primary hyperparathyroidism from familial hypocalciuric hypercalcemia (FHH).
Fractional Excretion of Calcium (FECa)
FECa (%) = [(Urine Calcium × Serum Creatinine) ÷ (Serum Calcium × Urine Creatinine)] × 100
This calculation estimates how much filtered calcium leaves the body through urine.
Using the calculator is easy.
The calculator performs the math instantly.
It also shows:
You can repeat the process with new values at any time.
Measured Calcium = 10.2 mg/dL
Albumin = 3.0 g/dL
Step 1
Albumin Difference
4 − 3.0 = 1.0
Step 2
Correction
0.8 × 1.0 = 0.8
Step 3
Corrected Calcium
10.2 + 0.8 = 11.0 mg/dL
Final Result
Corrected Calcium = 11.0 mg/dL
Urine Calcium = 220 mg/day
Serum Creatinine = 1.0 mg/dL
Serum Calcium = 11 mg/dL
Urine Creatinine = 1200 mg/day
CCCR
(220 × 1.0) ÷ (11 × 1200)
220 ÷ 13200
CCCR = 0.0167
Result
A CCCR between 0.01 and 0.02 is considered indeterminate. Doctors review other laboratory findings before making a diagnosis.
Urine Calcium = 12 mg/dL
Serum Creatinine = 1 mg/dL
Serum Calcium = 11 mg/dL
Urine Creatinine = 100 mg/dL
Step 1
(12 × 1) ÷ (11 × 100)
12 ÷ 1100
= 0.0109
Step 2
0.0109 × 100
FECa = 1.09%
Result
This value falls in the borderline range. Clinical findings remain important.
Think of the calculator like a smart math assistant.
You enter the numbers.
The calculator performs every formula.
It checks the result against accepted reference values.
Finally, it explains what the result may suggest.
This saves time and helps reduce simple calculation mistakes.
Our Hyperparathyroidism Calculator makes complex laboratory calculations simple. It calculates corrected calcium, CCCR, and FECa within seconds. It also explains each result in plain language.
Remember, these calculations support medical evaluation. They do not confirm or rule out hyperparathyroidism by themselves. Doctors always review calcium, parathyroid hormone, kidney function, vitamin D levels, symptoms, and other laboratory findings before making a diagnosis.
If you need fast, accurate, and easy laboratory calculations, this calculator is a reliable tool for everyday use.
A Hyperparathyroidism Calculator is an online tool that performs corrected calcium, CCCR, and FECa calculations. These values help evaluate calcium disorders.
No. It supports evaluation only. A healthcare provider must interpret the results together with PTH levels, symptoms, and other laboratory tests.
Albumin affects total calcium levels. Corrected calcium estimates the true calcium level when albumin is low or high.
CCCR helps distinguish primary hyperparathyroidism from familial hypocalciuric hypercalcemia (FHH).
FECa estimates the percentage of filtered calcium that leaves the body through urine.
Yes. The calculator supports both conventional and SI units.
Yes. The calculator uses established clinical equations for corrected calcium, CCCR, and FECa. These formulas are widely used in medical practice, but the results should always be interpreted by a qualified healthcare professional.