Guide to Diagnostic TestsABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZK+ (potassium)Kaposi sarcoma Kappa and lambda free light chains with ratio Kennedy disease/spinal and bulbar muscular atrophy Keratitis Ketoacidosis Ketones urine Kidney function tests for therapeutic drug monitoringKlebsiella pneumonia Kleihauer-Betke test KOH (potassium hydroxide) preparationK-ras gene mutations