Why does the amount of blood taken for tests can differ so much?

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Sometimes they take 4 vials, sometimes they can take up to 13 or so. Why is that? Is it **only** because they run different tests on different vials or they also compare stuff to make sure samples are not compromised?

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Anonymous 0 Comments

What the top post already said was great. But if they’re taking 13 tubes, the physician ordered a crap ton of tests. With that many tubes, you’re typically getting a lot of specialty tests that get sent out to Labcorp or Quest. In that case, you’re going to get one or two tubes for each test, even if they could otherwise be shared/split just because you don’t want to get a QNS and have to recollect.

Then sometimes you’ll get someone newer who doesn’t know their facility can do an iron panel on the same tube as a renal panel and they’ll get one tube per test, so your total tubes goes up.

Sometimes you’ll have 8 tests, but they’re all chemistries done in house, and thus can be done on 1 tube. Or you can have 8 tests which all need a different tube and different departments, needing 8 tubes.

So there are several factors. The number of tests, the amount of departments those tests are going to, are they send outs, does the phleb like to get extra…

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