The calculator adjusts calcium levels in cases of abnormal albumin—either hypoalbuminemia or hyperalbuminemia. It accepts three inputs: serum calcium, patient's albumin level, and what is considered the normal albumin level. Inputs come with different possible units: serum calcium can be in mg/dL or mmol/L, and albumin levels in g/dL or g/L.

Here's how the calculation works:

- First, ensure uniform units for computation:
  - If serum calcium is in mmol/L, convert it to mg/dL by multiplying by 4.
  - If albumin or normal albumin is in g/L, convert it to g/dL by dividing by 10.
  
- Calculate the corrected calcium using the formula:
  - correctedCalcium = serum calcium + (0.8 × (normal albumin - patient albumin))
  
This formula accounts for albumin's effect on calcium binding. Each 1 g/dL difference in albumin level corresponds to a 0.8 mg/dL adjustment in calcium, reflecting the binding influence.

- If the corrected calcium needs to be in mmol/L, convert it from mg/dL by dividing by 4.
  
The calculator returns the corrected calcium value in the preferred unit, rounded to two decimal places for precision.

Here's a quick reference for input and output ranges:
- Serum Calcium: 1-20 mg/dL or 0.25-5 mmol/L
- Albumin: 0-10 g/dL or 0-50 g/L
- Normal Albumin: 0-10 g/dL or 0-50 g/L
- Corrected Calcium: 0-20 mg/dL or 0-5 mmol/L

Understanding these adjustments enables healthcare providers to more accurately evaluate metabolic and nutritional statuses in patients with abnormal albumin levels.

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Calcium Correction for Hypoalbuminemia and Hyperalbuminemia