Evaluation of Dosing Procedures of Chemotherapy Treatment (Carboplatin) With the Contrast Agent Iohexol

Inclusion Criteria: * Patients must have the psychological ability and general health that permits completion of the study requirements and required follow up * For men who are sexually active, the need for use of medically acceptable contraception will be dictated by the primary treatment plan/protocol * Study accrual was closed to women on 08/18/2021 and accrual is now only open to males in order to meet accrual goals and study objectives. (11-AUG-2021) * Male sex * Any patients who will receive treatment with intravenous carboplatin (any AUC, any cycle) on a National Cancer Institute (NCI)-sponsored National Clinical Trial Network (NCTN)-, Experimental Therapeutics Clinical Trials Network (ETCTN)-, trial, local trial, or through standard of care * Age \>= 18 * The patient or a legally authorized representative must provide study-specific informed consent prior to study entry Exclusion Criteria: * Treated at an institute where creatinine is not measured with an IDMS calibrated assay * History of allergic reactions to computed tomography (CT) contrast, iodine or shellfish, or history of anaphylactic reaction to any food item * Recent (last 6 months) episode of acute kidney injury, have sickle cell disease, or have current indwelling nephrostomy tubes * Edema beyond trace edema, because this will impact iohexol equilibration and distribution * Ascites (including pleural effusion) beyond trace ascites, because this will impact iohexol equilibration and distribution * Who…