What is the test for modification of child support under the abuse standard?

We review orders granting or denying requests for modification of child support under the abuse of discretion standard. (Plumas County Dept. of Child Support Services v. Rodriquez (2008) 161 Cal.App.4th 1021, 1026.) The trial court's exercise of its discretion must be "'informed and considered,'" the court may not "'ignore or contravene the purposes of the law'" (ibid.), and the court's discretion is granted and limited by the statutes and rules regulating child support (In re Marriage of Williams

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(2007) 150 Cal.App.4th 1221, 1234). We review the trial court's factual findings for substantial evidence and consider the evidence in the light most favorable to the party who prevailed in the trial court. (Plumas County Dept. of Child Support Services v. Rodriquez, supra, at p. 1026.)