In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (Cr) (mg/dL). Outside the United States, particularly in Canada and Europe, the truncated term urea is used (though it is still the same blood chemical) and the units are different (mmol/L).
Your child must be both physically and emotionally ready for toilet training. Most children are ready to start when they are between 22 and 30 months of age, but every child is different. Toilet training usually becomes a long and frustrating process if you try to start it before your child is ready.
What is the right age for potty training? There is no set age at which potty training or toilet training should begin; the right time depends on your child's development and readiness. But don't worry, there are ways and signs to tell if your child is able and ready to be potty trained. Potty Training Readiness - 4 Signs of Child Readiness: 1  physiological development (bladder and bowel control) 2  motor skills. 3  his/her cognitive and verbal development and. 4  emotional & social awareness.