Clinical Notes : Video guides
1. How to perform a KOH preparation
Procedure to make 100 ml of KOH 20% w/v solution:
-
Weigh 20 g potassium hydroxide (KOH) pellets.
-
Transfer the chemical to a screw-cap bottle.
-
Add 50 ml distilled water, and mix until the chemical is completely dissolved, add remaining distilled water and make the volume 100 ml.
-
Label the bottle and mark it corrosive. Store it at room temperature. The reagent is stable for up to 2 years.
Caution: Potassium hydroxide is a highly corrosive deliquescent chemical, therefore handle it with great care and make sure the stock bottle of chemical is tightly stoppered after use.
Republic of Ireland NOTES :
This video guide is of relevance to the following :
Tinea capitis and erythema nodosum - 47
Tinea corporis and cruris - 67
