Bone Health Blood Test

Serum Vitamin D, calcium, phosphorus, parathyroid hormones (PTH), reduced exercise capacity, delayed onset of puberty, and liver abnormalities may cause Fontan patients to have weak bones and muscles and vitamin D deficiency. The clinic will check blood levels of vitamin D and recommend vitamin D supplementation, as necessary.

DXA Scan to Measure Bone Health

Patients with the Fontan circulation commonly have low bone density. DXA is the preferred technique for measuring bone mineral density because it is relatively easy to perform and the amount of radiation exposure is low. Patients with low bone density will be referred to a specialist for further evaluation and treatment.

Bone Age & Sexual Maturity Test

Like other chronic diseases, chronic heart disease can delay the growth and maturation. A bone age study estimates the maturity of a child’s skeletal system which can help doctors diagnose delayed growth and development. It’s usually done by taking a low dose X-ray of the wrist, hand, and fingers. Sexual maturity will be assessed by the endocrinologist and your self-reporting of sexual maturity staging. If required, delayed growth and sexual maturation can be treated with medication.