Intermittent and continuous faecal markers in short-term metabolic balance studies in young women

Abstract

1 The continuous faecal marker chromic oxide, Cr₂O₃, and the intermittent marker brilliant blue were used together in metabolic balance studies of calcium and magnesium in two young women.2. Faecal output was derived by four methods: no marker, brilliant blue, Cr₂O₃, or both brilliant blue and Cr₂O₃.3. Balances of Ca and Mg derived by the four methods of obtaining faecal output were compared.4. Recovery of ingested Cr₂O₃ in the faeces appeared complete in experiments on three further subjects, with only a negligible amount being excreted in the urine.5. Simultaneous use of both types of marker is recommended for short-term balance studies of nutrients such as Ca and Mg which are not readily absorbed.