Calcium phosphate solubility curve
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Each curve represents the maximum solubility of calcium and phosphate for a specific amino acid concentration.
The red "+" represents the Calcium and Phosphate concentrations of the current TPN formula.
The TPN is unsafe if the red "+" lies to the right of the solubility curve for the current amino acid concentration.
In the following example, the TPN is safe at all Amino Acid concentrations because the red "+" lies to the left of all three curves.
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