From: Consensus guideline for the diagnosis and treatment of tetrahydrobiopterin (BH4) deficiencies
 | PTPSD | DHPRD | AR-GTPCHD | SRD | PCDD | AD-GTPCHD |
---|---|---|---|---|---|---|
Number of reported cases | 125 | 77 | 55 | 53 | 19 | 570 |
Nervous system | ||||||
 Developmental delay | +++ | +++ | +++ | +++ | + | (+) |
 (Axial) Hypotonia | +++ | ++ | +++ | +++ | + | (+) |
 Poor head control | + | + | + | + |  | (+) |
 Hypertonia | ++ | ++ | ++ | ++ | (+) | ++ |
 Epilepsy | ++ | +++ | + | + |  |  |
 Cognitive impairment | ++ | + | (+) | ++ |  | (+) |
 Impaired speech development | + | (+) | (+) | +++ |  | (+) |
 Dysarthria | (+) | (+) |  | +++ |  | (+) |
Movement disorders | ||||||
 Diurnal fluctuation of symptoms |  |  | + | +++ |  | +++ |
 Dystonia | + | + | ++ | +++ |  | +++ |
 Oculogyric crises | (+) | + | (+) | +++ |  | (+) |
 Gait difficulties |  |  |  |  |  | +++ |
 Dyskinesia/other involuntary movements | + | + | (+) | +/++ |  |  |
 Parkinsonism/hypokinesia | + | (+)/+ | + | +++ |  | + |
 Tremor | (+) | (+) | (+) |  | (+) | + |
 Ataxia | (+) | (+) |  | + |  | (+) |
Other | ||||||
 Hyperreflexia | (+)/+ | + |  |  |  | ++ |
 Irritability | (+)/+ | + |  |  |  |  |
 Microcephaly |  | ++ | (+) | (+) |  |  |
Autonomous nervous system | ||||||
 Temperature instability | (+) | (+) | ++ | ++ |  |  |
Gastrointestinal system | ||||||
 Hypersalivation | (+) | + | ++ | +/++ |  |  |
 Feeding/swallowing difficulties | + | + | (+) | ++ |  | (+) |
Psychological problems | ||||||
 Behavioural problems | (+) | (+) |  | (+) |  |  |
 Psychiatric problems | (+) | (+) |  | ++ |  | + |
Sleep problems | (+) | (+) | Â | ++ | Â | (+) |
Endocrine disturbances | ||||||
 Growth-hormone deficiency | (+) |  |  |  |  |  |
 Low birth weight | ++ |  |  |  |  |  |
 Central hypothyroidism |  |  |  | (+) |  |  |
 MODY3-like diabetes |  |  |  |  | + |  |
Other | ||||||
 Microcephaly |  | ++ | (+) | (+) |  |  |
 Fatigability | (+) | + |  | (+) |  | (+) |
 Recurrent chest infections | + |  |  |  |  |  |
 Prematurity | + | + |  |  |  |  |
 Hypomagnesemia |  |  |  |  | + |  |