The table is based on the recommendations of two scientific working group meetings, held in March 1994 and May 1995. The criteria was reassessed and updated by a subsequent scientific working meeting in March 2000. The fulltext of the new criteria is available on-line. No restriction on use. WHO 2 Can use the method.
Advantages generally outweigh theoretical or proven risks.
Category 2 conditions could be considered in choosing a method. If the client chooses the method, more than usual follow-up may be needed. WHO 3 Should not use the method unless a doctor or nurse makes a clinical judgement that the client can safely use it. Theoretical or proven risks usually outweigh the advantages of the method. Method of last choice, for which regular monitoring will be needed.