Grandchamp B, Grelier M, Nordmann Y
Nouv Presse Med. 1975 Jun 14;4(24):1801-2.
Measurement of uroporphyrinogen I synthetase activity in red blood cells indicates a 40-50 p.cent decrease in patients with intermittent acute porphyria (30 +/- 6 units) when compared to normal control subjects (50 +/- 8 units). This measurement makes relatively easy the detection of asymptomatic carriers of the genetic defect, as early as the first day of life.