Corrected Calcium Calculator
Adjusts serum calcium for low albumin levels. Standard calcium tests can underestimate true calcium when albumin is low — common in hypoparathyroid patients, kidney disease, and cancer patients.
Formula
Corrected Ca = Measured Ca + 0.8 × (4.0 − Albumin)
When is this useful?
About 40% of calcium in your blood is bound to albumin. When albumin is low (hypoalbuminemia), standard calcium tests can appear falsely low. This correction estimates what your calcium would be at a normal albumin level of 4.0 g/dL.
Commonly used for patients on Yorvipath/PTH therapy for hypoparathyroidism, those with kidney disease, liver disease, or malnutrition.
💊 Note for Hypoparathyroidism Patients (Yorvipath / PTH Therapy)
Albumin-adjusted calcium is especially important when you have hypoparathyroidism and are managing your calcium levels with PTH replacement therapy (such as Yorvipath).
Even when your albumin is normal (4.0 g/dL), using the corrected formula helps standardize how your calcium is tracked over time — because small shifts in albumin (common with dietary changes, illness, or hydration) can make your measured calcium appear falsely high or low.
Target range for most Yorvipath patients: 8.0–9.5 mg/dL (corrected).
Always follow your endocrinologist's specific targets, which may differ.