Which vein(s) is/are a commonly used site for venipunctures?

If a patient has a retroperitoneal infection, what organ could be involved?

A) Bladder B) Kidney C) Gallbladder D) Small intestine

The linearity of a method is represented by which of the following equations?

A) A = 2 - log %T B) %CV = standard deviation/mean times 100 C) A = abc D) Y = a + bX