Table 8.

Recommended Surveillance for Individuals with Prader-Willi Syndrome

System/ConcernEvaluationFrequency
Developmental delay /
Intellectual disability
Monitor developmental progress & educational needs.At each visit
Cryptorchidism Monitor testicular position, as cryptorchidism may recur after orchidopexy.Annually
Endocrine Glycosylated hemoglobin concentration &/or glucose tolerance test to assess for diabetesAnnually if obese or beginning in adolescence or w/rapid significant weight gain or other symptoms (e.g., polyuria/polydipsia)
Free T4 & TSH levels to assess for hypothyroidismEvery 6-12 mos beginning in infancy
Assess for central adrenal insufficiencyAs needed based on symptoms & during illness & surgery
Growth/Appetite/Obesity Monitor height, weight, & BMI 1
  • Every month in infancy
  • Every 6 mos in 1st decade of life
  • At least annually thereafter
  • More frequently if caregivers identify rapid weight gain
Behavioral/Psychiatric Assess for presence of behavioral findings & obsessive-compulsive features w/family or caregivers.Annually after age 2 yrs
  • Assess for psychosis.
  • Evidence of radical behavior change, hallucinations, delusions, or disorientation should prompt psychiatry eval.
Annually in adolescents & adults
Dermatologic Skin exam for sores &/or signs/symptoms of cutaneous infectionAt each visit
Vision Ophthalmologic exam to assess for strabismus &/or refractive errorsAnnually
Sleep Assess for snoring, frequent nocturnal awakening, & new behavioral issues w/family or caregivers.Annually
Evaluate respiratory status during sleep w/sleep study.Prior to initiation of GH therapy & 4-8 wks after starting GH therapy, & if clinical symptoms arise thereafter (e.g., snoring, frequent nocturnal awakening, behavioral issues)
Overnight sleep study followed by multiple sleep latency testing & video EEGIn those w/excessive daytime sleepiness / narcolepsy / cataplexy
Scoliosis Clinical exam for scoliosisAt each visit beginning when child can sit independently
Spine x-rays for scoliosis in those w/:
  • Clinical findings suggestive of scoliosis
  • Obesity
Annually
Osteoporosis Bone densitometry by DXA scanEvery 2 yrs beginning in adolescence
Seizures Assess for new seizures or monitor those w/seizures as clinically indicated.At each visit
Dental Dental evalAt least every 6 mos after teeth erupt or every 3-4 mos if dental issues are present
Family/Community Assess family need for social work support (e.g., palliative/respite care, home nursing, other local resources), care coordination, or follow-up genetic counseling if new questions arise (e.g., family planning).At each visit

BMI = body mass index; DXA = dual-energy x-ray absorptiometry; GH = growth hormone; T4 = thyroxine; TSH = thyroid-stimulating hormone

1.

Weight in kg, height in m2

From: Prader-Willi Syndrome

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