Positive yield of investigations in 65 infants
| Investigation | Percentage abnormal | Definition of abnormal |
|---|---|---|
| Radio-isotope milk scan | 89 | Reflux through gastro-oesophageal sphincter seen on single phase scan |
| Chest radiograph | 55 | As reported by paediatric radiologist |
| Lactate (blood) | 54 | >2 mmol/l |
| 15 | >3 mmol/l | |
| White cell count (blood) | 33 | >12 cells/mm3 |
| Bicarbonate (blood) | 20 | <20 mmol/l |
| Urine culture | 13 | White cells >50 × 105 per high powered field + pure growth of bacteria |
| Haemoglobin | 13 | <2 standard deviations for age adjusted range |
| Post-nasal swab | 7 | Culture for pertussis |
| Ammonia (blood) | 4 | >100 mmol/l |
| Metabolic screen: amino acids (blood) | 4 | |
| organic acids (urine) | 2 | |
| Toxicology screen (urine) | 3 | |
| Na, K, urea, creatinine and glucose (blood) | 0 |