In short: no, this would not be possible.
<PERSON> used the trace amounts of iron in the guard's blood to take advantage of his magnetic powers. By extracting the iron, he was able to use it as a weapon to escape. It is also mentioned that the guard in question had more iron than a normal human being would have, but this does not matter for the purpose of this question. It would be arguable that the difference would be great enough given the known limitations of metal bending.
On the other hand, "Metalbending" from the Avatar series works off an entirely different concept:
During a lecture about chakras, Guru <PERSON> explained to Avatar <PERSON> that metal is merely earth that has been purified and refined. 722
Utilizing her unique ability to "see" using earthbending, <PERSON> was able to perceive the trace amount of "unpurified" crude earth still present in the metal, target it, and use it to bend the purified metal itself.
In the case of "Metalbending", it takes advantage of metals that aren't 100% pure. From the same page:
During the events of the Anti-bending Revolution, it was revealed that metalbending is ineffective against highly purified metal.
In this case the iron and other trace metals in a person's blood just wouldn't be bendable due to the limitations seen in both shows. The closest thing we get is an incident revolving around Mercury poisoning:
however, when the young airbender revealed that the venom was metal-based and <PERSON>'s younger sister promptly removed most of it from <PERSON>'s system, saving the Avatar's life.
However even this was only able to remove the majority of the Mercury:
Nonetheless, the poison had caused significant internal damage, rendering <PERSON> unable to walk for nearly six months and incapable of contacting <PERSON> or entering the Avatar State. In addition, the residual traces of poison in her body prevented her from making a full recovery.
We could make the argument that this means that even pure metals could be removed, but it is mentioned that the one who removed the Mercury, <PERSON>, also relied on the impurities to effectively "bend" it:
When <PERSON> first taught <PERSON> metalbending, she got her to feel the fine pieces of earth inside a metal sculpture.
(source)
This would explain why there were still trace amounts of Mercury in <PERSON>'s body, since there wasn't enough impurities for <PERSON> to "bend" all of it out. So even for the very powerful metal benders, they wouldn't be able to do much with the metal in someone's body unless it was a very substantial amount of metal. 722