The Range and Variability of Biochemical Indices: What is ‘normal’?

M. K. Horwitt, C. C. Harvey, O. W. Hills, E. Liebert, Correlation of urinary excretion of riboflavin with dietary intake and symptoms of ariboflavinosis. Journal of Nutrition. ,vol. 41, pp. 247- 264 ,(1950) , 10.1093/JN/41.2.247

R.G. Whitehead, J.D.L. Frood, E.M.E. Poskitt, Value of serum-albumin measurements in nutritional surveys. A reappraisal. The Lancet. ,vol. 298, pp. 287- 289 ,(1971) , 10.1016/S0140-6736(71)91334-1

J. A. Tillotson, E. M. Baker, An enzymatic measurement of the riboflavin status in man The American Journal of Clinical Nutrition. ,vol. 25, pp. 425- 431 ,(1972) , 10.1093/AJCN/25.4.425

A.R. Bradwell, M.H.B. Carmalt, T.P. Whitehead, EXPLAINING THE UNEXPECTED ABNORMAL RESULTS OF BIOCHEMICAL PROFILE INVESTIGATIONS The Lancet. ,vol. 304, pp. 1071- 1074 ,(1974) , 10.1016/S0140-6736(74)92166-7

Marilyn Mclaughlin, Angela Fairney, Eva Lester, P.R. Raggatt, D.J. Brown, M.R. Wills, Seasonal variations in serum 25-hydroxycholecalciferol in healthy people. The Lancet. ,vol. 303, pp. 536- 538 ,(1974) , 10.1016/S0140-6736(74)92717-2

J. Andrews, M. Brook, Margaret A. Allen, Influence of abode and season on the vitamin C status of the elderly. Gerontologia Clinica. ,vol. 8, pp. 257- 266 ,(1966) , 10.1159/000244962

D. I. Thurnham, P. Migasena, Niyomsri Vudhivai, Venus Supawan, Riboflavin supplementation in a resettlement village in north-east Thailand. British Journal of Nutrition. ,vol. 28, pp. 91- 97 ,(1972) , 10.1079/BJN19720011

D P Rose, Aspects of tryptophan metabolism in health and disease: a review. Journal of Clinical Pathology. ,vol. 25, pp. 17- 25 ,(1972) , 10.1136/JCP.25.1.17

C GILES, MEGALOBLASTIC ANÆMIA OF PREGNANCY AND THE PUERPERIUM The Lancet. ,vol. 272, pp. 1341- 1347 ,(1958) , 10.1016/S0140-6736(58)91437-5

P. Wilding, J.G. Rollason, D. Robinson, Patterns of change for various biochemical constituents detected in well population screening Clinica Chimica Acta. ,vol. 41, pp. 375- 387 ,(1972) , 10.1016/0009-8981(72)90534-7