This one seems like an easy question but I don't know where to start. Please help!

In serum, about 55% of total serum calcium is bound. The measurement of ionized (free) calcium with an ISE is 1.10 mM. What is an estimate of the total calcium in this specimen?

2 answers

BLD 414?
My guess is that since 55% is bound, that means 45% is free.

So... make a ratio and solve for x

.45/1.10mM = .55/x

Whatever x equals, add it to 1.10mM since we are looking for the total calcium in serum.

What do you think?
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