Minor test

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The Minor test (starch-iodine test) described by Minor in 1928[1] is a qualitative test used to evaluate sudomotor function (sweating).


An iodine solution is applied to the skin and allowed to air-dry. Once dry the area is dusted with cornstarch or potato flour. Sweating is then encouraged with the aid of pilocarpine, the use of a sauna or exercise.

When sweat reaches the surface of the skin the starch and iodine combine causing a dramatic color change (yellow -> dark blue) allowing sweat production to be actively visualized.


The minor test can be used as a diagnostic tool to evaluate underactive (hypohidrosis)[2] and overactive (hyperhidrosis) sweating.


  1. ^ Minor V. "Ein neues Verfahren zu der klinischen Untersuchung der Schweissabsonderung", Dtsch Z Nervenheilkd, 1928;101302-7.
  2. ^ Chia, K. Y.; Tey, H. L. (2012). "Approach to hypohidrosis". Journal of the European Academy of Dermatology and Venereology. 27 (7): 799–804. doi:10.1111/jdv.12014. PMID 23094789.