<prompt> L- arginine test is used for testing reserve of?ProlactinCosyntropin testMetyrapone testGrowth hormone  <response>: Tests used for testing reserves of hormones GH Insulin tolerance test GHRH test L-arginine test L-dopa test Prolactin TRH stimulation test Cosyntropin test ACTH effect on plasma coisol Metyrapone test ACTH effect on plasma coisol 