Will a high level of urinary ketones in late pregnancy cause the baby to be mentally impaired?

Generally speaking, a high level of ketones in urine during the late stages of pregnancy will not cause fetal intellectual impairment. Fetal intellectual disability is usually associated with chromosomal abnormalities. Elevated urinary ketones in late pregnancy may result from starvation-induced ketonuria in the mother or may be due to maternal hyperglycemia. The details are as follows:

1. Starvation Ketonuria

After becoming pregnant, most women experience pregnancy-related symptoms such as nausea, vomiting, reduced appetite, and significantly decreased food intake. Prolonged starvation places the pregnant woman in a state where ketones (+) may appear in the urine. However, it's important to check whether the mother's blood glucose levels are normal and rule out positive urinary ketones caused by diabetes. For starvation ketonuria, it is recommended that pregnant women eat small, frequent meals and increase their food intake to increase urine output. Intravenous fluid therapy may be necessary when needed to prevent worsening conditions such as electrolyte imbalances and acidosis, which could negatively affect fetal development and maternal health.

2. Hyperglycemia

If a pregnant woman has high blood glucose levels during early pregnancy and fails to control it promptly, it may easily lead to congenital malformations in the fetus, affecting the heart, kidneys, or causing genetic issues. It may also result in elevated fetal blood glucose and increase the likelihood of the baby developing type 1 diabetes after birth. Once elevated blood glucose is detected in a pregnant woman, timely blood sugar control is essential. If lifestyle modifications and dietary changes alone cannot achieve adequate control, the pregnant woman should also engage in appropriate physical activity to help lower blood glucose levels.

Finally, it is important to have regular prenatal checkups at the hospital throughout pregnancy to monitor both the mother’s health and the normal growth and development of the fetus.