Medical test - Calcium vs Corrected Calcium level?

What is the difference between Calcium and Corrected Calcium stated in medical test?
What does it means?

albumin binds calcium to a large extent, patients with abnomal albumin content will have abnormal calcium levels for this reason.

The only (never say only in medicine) active calcium in your body is NOT protein bound. So what really matters is the ionized version. Simple formulas based on the ratios of albumin/calcium binding help to estimate the physiologic calcium level.

Ionized calcium can be tested for directly, and corrected levels are simply a guess.

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