In what clinical scenarios should we use the 2-day 2mg DST instead of the 1mg overnight DST for screening of Cushing syndrome?

The 2-day low-dose DST may be of some value in patients suspected to have nonneoplastic hypercortisolism (normal cortisol <1.4-1.8 ug/dL). The Dex/CRH test performs better in such patients, but the CRH is not available.