Table 4

Adult reference ranges

SpecimenAnalyteReference range
Urinary porphyrin: creatinine ratios are higher in children weighing less than 30 kg or less than 9 years old.10
The reference range for erythrocytes refers to packed erythrocytes.
UrinePorphobilinogen<10 μmol/l
<1.5 μmol/mmol creatinine
Total porphyrin20–320 nmol/l
<35 nmol/mmol creatinine
FaecesTotal porphyrin10–200 nmol/g dry wt
ErythrocytesTotal porphyrin0.4–1.7 μmol/l