Why is Insulin Like Growth Factor-1 measured in the plasma instead of GH?

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Why is Insulin Like Growth Factor-1 measured in the plasma instead of GH?

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A. IGF-1 levels are measured due to the ephemeral blood levels of GH. While GH is broken down in the liver about an hour after being released into the blood, IGF-1 levels (which are directly stimulated by GH) last for up to 18 hours.

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