<prompt> Which is the screening test for acromegaly?Serum IGF-2Oral glucose tolerance testGH levelsSerum IGF-1  <response>: The screening test for acromegaly is Serum IGF-1 levels. IGF-2 is responsible for prenatal growth. Oral glucose tolerance test with GH obtained at 0, 30 and 60 minutes. Normal people can supress growth hormone to 1gL. Due to pulsatile nature of GH secretion, measurement of a single random value is not useful for diagnosis or exclusion of acromegaly. 