5-Minute Pediatric Consult
- Obesity-hypoventilation syndrome
- Obsessions
- Obstructive hypoventilation
- Obturator sign
- Occult spinal dysraphism
- Ochoa syndrome
- Ocular bruit
- Ocular rosacea
- Ocular syphilis
- Ocular toxoplasmosis
- Ocular trachoma
- Oculo-auriculo-vertebral spectrum
- Oculocerebrorenal syndrome
- Oculoglandular tularemia
- Oculomandibulofacial syndrome
- Odynophagia
- Ohtahara syndrome
- Oligospermia, cancer therapy and
- Omphalocele-exstrophy of the bladder-IA-spinal defects (OEIS) complex
- Omphalomesenteric cyst
- Omphalomesenteric duct, persistent
- Omphalomesenteric fistula
- Onychomycosis
- Oophoritis
- Ophthalmologic toxicity, in cancer therapy
- Ophthalmoplegic migraine
- Opioid intoxication
- Opitz-Kaveggia syndrome
- Opitz syndrome
- Opportunistic infections
- Opsoclonus-myoclonus syndrome
- Optic ataxia
- Optic atrophy syndrome
- Optic nerve atrophy
- Optic pathway tumors (OPTs)
- Oral allergy syndrome
- Oral habits, nonfunctional or parafunctional
- Oral hygiene
- Oral motor disorder
- Oral toxicity, in cancer therapy
- Orbital abscess
- Organophosphate ingestion
- Orofacial syndrome
- Oropharyngeal tularemia
- Orthodontics, in cleft lip and palate
- Orthostatic proteinuria
- Ortolani test
- Osgood-Schlatter disease
- Osler-Weber-Rendu syndrome
- Osteitis
- Osteogenesis imperfecta
- Osteomalacia
- Osteopetrosis
- Osteoradionecrosis
- Osteosarcoma
- Oto-respiratory reflex
- Ototoxicity, in cancer therapy
- Ovarian dysgerminomas
- Ovarian germ cell tumors
- Ovarian insufficiency, premature
- Ovarian ischemia
- Ovarian mass
- Overriding aorta
- Overuse syndromes
- Ovotesticular DSD
- Oxalosis
- Oxygen saturation