5-Minute Pediatric Consult
- Obesity-hypoventilation syndrome
- Observation, direct
- Obsessions
- Obsessive-compulsive–related disorders (OCRDs)
- Obstructive hydrocephalus
- Obturator sign
- Occult spinal dysraphism
- Ochoa syndrome
- Ocular adnexal lymphoid proliferation
- Ocular herpes simplex infection
- Ocular myasthenia gravis
- Ocular plague
- Ocular rosacea
- Ocular syphilis
- Ocular toxoplasmosis
- Ocular trachoma
- Oculodermal melanocytosis
- Oculoglandular tularemia
- Oculomandibulodyscephaly
- Odynophagia
- Ohtahara syndrome
- Oil of wintergreen, toxicity of
- Ollier disease
- Omental mass
- Omphalocele, exstrophy, imperforate anus, and spinal defects (OEIS)
- Omphalomesenteric cyst
- Omphalomesenteric duct, persistent
- Omphalomesenteric fistula
- Onychomadesis
- Onychomycosis
- Oophoritis
- Open angle glaucoma, juvenile
- Opioid abuse/dependence
- Opioid intoxication
- Opioid overdose
- Opioid withdrawal syndrome, neonatal
- Opitz-Kaveggia syndrome
- Oppositional defiant disorder
- Opsoclonus-myoclonus syndrome
- Optic ataxia
- Optic nerve atrophy
- Optic pathway tumors (OPTs)
- Oral hygiene
- Oral presentation framework
- Orchiectomy
- Orexin (hypocretin) deficiency
- Organic acidemias
- Organic acidurias
- Orientia tsutsugamushi
- Ornithine transcarbamylase (OTC) deficiency
- Ornithodoros tick
- Oro-facial-digital syndrome
- Orofaciodigital syndrome type I
- Oropharyngeal cancer
- Oropharyngeal herpes infections
- Oropharyngeal trauma
- Oropharyngeal tularemia
- Orthopnea
- Orthostatic proteinuria
- Osler nodes
- Osler-Weber-Rendu syndrome
- Osteoblastoma
- Osteochondroma
- Osteogenesis imperfecta
- Otitis media–conjunctivitis syndrome
- Otomycosis
- Oto-respiratory reflex
- Outlet ventricular septal defect
- Ovarian cyst
- Ovarian germ cell tumors
- Ovarian infarction
- Ovarian insufficiency, premature
- Ovarian ischemia
- Ovarian mass
- Ovarian tumors
- Overflow proteinuria
- Oxycephaly