| Costongs GMPJ, Janson PCW and Bas BM, 1985, J Clin Chem Clin Biochem, 23, 7-16 | 12.0 | | Mixed | Healthy (excl pregnant) | Serum |
| Harris EK, Kanofsky P, Shakarji G and Cotlove E, 1970, Clin Chem, 16, 1022-7 | 5.6 | 7.8 | Mixed | Healthy (excl pregnant) | Serum |
| Eckfeldt J,Chambless Ll and Shen Y, 1994, Arch Pathol Lab Med, 118, 496-500 | 4.2 | 10.8 | Mixed | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 6.1 | 5.9 | Females | Healthy (excl pregnant) | Serum |
| Ricós C, Codina R, 1989, Rev Diag Biol, 38, 34-6 | 10.8 | | Mixed | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 6.9 | 8.1 | Mixed | Healthy (excl pregnant) | Serum |
| Carlsen S, Petersen PH, Skeie S, Skadberg O and Sandberg S, 2011, Clin Chem Lab Med, 49, 1501-7 | 4.5 | 5.8 | Mixed | Healthy (excl pregnant) | Capillary plasma |
| Carlsen S, Petersen PH, Skeie S, Skadberg O and Sandberg S, 2011, Clin Chem Lab Med, 49, 1501-7 | 5.4 | 5.6 | Mixed | Healthy (excl pregnant) | Serum |
| Davie SJ, Whiting KL, Gould BJ., 1993, Ann Clin Biochem, 30, 260-64 | 12.1 | 3.2 | Mixed | Healthy (excl pregnant) | Serum |
| Pineda-Tenor D , Laserna-Mendieta EJ, Timon-Zapata J, Rodelgo-Jimenez L, Ramos-Corral R, Recio-Montealegre A and Gomez-Serranillos Reus M, 2013, Clin Chem Lab Med, 51, 851-62 | 3.7 | 8.8 | Males | Healthy (excl pregnant) | Serum |
| Cummings ST and Fraser CG, 1988, Ann Clin Biochem, 25, 634-7 | 4.8 | 6.1 | Mixed | Healthy (excl pregnant) | Plasma |
| Young DS, Harris EK and Cotlove E, 1971, Clin Chem, 17, 403-10 | 6.6 | 2.7 | Males | Healthy (excl pregnant) | Serum |
| Rizi EP, Baig S, Toh SA and Khoo CM, 2016, Pathology , 48, 510-2 | 3.4 | 6.2 | Mixed | Non-healthy (excl pregnant) | Plasma |
| Pineda-Tenor D , Laserna-Mendieta EJ, Timon-Zapata J, Rodelgo-Jimenez L, Ramos-Corral R, Recio-Montealegre A and Gomez-Serranillos Reus M, 2013, Clin Chem Lab Med, 51, 851-62 | 4.5 | 7.5 | Females | Healthy (excl pregnant) | Serum |
| Aarsand AK, Diaz-Garzón J, Fernández-Calle P, et al, 2018, Clin Chem, 64(9), 1380-93 | 4.7 | 8.1 | Mixed | Healthy (excl pregnant) | Serum |
| Lacher DA, Hughes JP and Carroll MD, 2005, Clin Chem, 51, 450-2 | 8.3 | 12.5 | Mixed | Healthy (excl pregnant) | Plasma |
| Cummings ST and Fraser CG, 1988, Ann Clin Biochem, 25, 634-7 | 11.2 | 11.1 | Mixed | Healthy (excl pregnant) | Plasma |
| Parrinello CM, Lutsey PL, Couper D, Eckfeldt JH, Steffes MW, Coresh J and Selvin E, 2015, Clin Chem, 61, 1540-1 | 5.3 | | Mixed | Healthy (excl pregnant) | Plasma |
| Parrinello CM, Lutsey PL, Couper D, Eckfeldt JH, Steffes MW, Coresh J and Selvin E, 2015, Clin Chem, 61, 1540-1 | 9.6 | | Mixed | Non-healthy (excl pregnant) | Plasma |
| Rizi EP, Baig S, Toh SA and Khoo CM, 2016, Pathology , 48, 510-2 | 3.7 | 9.4 | Mixed | Non-healthy (excl pregnant) | Plasma |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 2.6 | 37.96 | Males | Healthy (excl pregnant) | Serum |
| Carlsen S, Petersen PH, Skeie S, Skadberg O and Sandberg S, 2011, Clin Chem Lab Med, 49, 1501-7 | 31.1 | 16.3 | Mixed | Non-healthy (excl pregnant) | Plasma |
| Bailey D, Bevilacqua V, Colantonio DA, Pasic MD, Perumal N, Chan MK and Adeli K, 2014, Clin Chem, 60, 518-29 | 11.4 | 9.1 | Mixed | Healthy (excl pregnant) | Plasma |
| Costongs GMPJ, Janson PCW and Bas BM, 1985, J Clin Chem Clin Biochem, 23, 7-16 | 13.3 | | Mixed | Healthy (excl pregnant) | Serum |
| Carlsen S, Petersen PH, Skeie S, Skadberg O and Sandberg S, 2011, Clin Chem Lab Med, 49, 1501-7 | 30.5 | 16.8 | Mixed | Non-healthy (excl pregnant) | Serum |
| Fraser CG and Williams P, 1983, Clin Chem, 29, 508-10 | 27.7 | 8.1 | Males | Non-healthy (excl pregnant) | Plasma |
| Godsland IF, 1985, Ann Clin Biochem, 22, 618-24 | 4.6 | | Mixed | Healthy (excl pregnant) | Plasma |
| Qi Z, Chen Y, Zhang L, Ma X, Wang F, Cheng Q, Du J, Hao Y, Chi S, Cui W, 2016, Clin Chim Acta, 452, 87-91 | 5.0 | 5.83 | Mixed | Healthy (excl pregnant) | Plasma |
| Cummings ST and Fraser CG, 1988, Ann Clin Biochem, 25, 634-7 | 10.9 | 19.6 | Mixed | Healthy (excl pregnant) | Plasma |
| Rohlfing C, Wiedmeyer HM, Little R, Grotz VL, Tennill A, England J, Madsen R, Goldstein D, 2002, Clin Chem, 48, 1116-8 | 5.7 | 5.8 | Males | Healthy (excl pregnant) | Plasma |
| Costongs GMPJ, Janson PCW and Bas BM, 1985, J Clin Chem Clin Biochem, 23, 7-16 | 7.9 | | Mixed | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 6.3 | 6.7 | Males | Healthy (excl pregnant) | Serum |
| Fraser CG., Cummings ST., Wilkinson SP., Neville RG., Knox JDE, Ho O and MacWalter RS, 1989, Clin Chem, 35, 783-6 | 4.7 | 5.4 | Males | Healthy (excl pregnant) | Serum |
| Pineda-Tenor D , Laserna-Mendieta EJ, Timon-Zapata J, Rodelgo-Jimenez L, Ramos-Corral R, Recio-Montealegre A and Gomez-Serranillos Reus M, 2013, Clin Chem Lab Med, 51, 851-62 | 6.8 | 7.3 | Females | Healthy (excl pregnant) | Serum |
| Dimitri G, Bolner A and Gheller A, 1992, Biochim Clin, 16, 401-3 | 4.7 | | Mixed | Healthy (excl pregnant) | Serum |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 20.2 | 36.07 | Mixed | Non-healthy (excl pregnant) | Serum |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 6.9 | 34.64 | Females | Healthy (excl pregnant) | Serum |
| Qi Z, Chen Y, Zhang L, Ma X, Wang F, Cheng Q, Du J, Hao Y, Chi S, Cui W, 2016, Clin Chim Acta, 452, 87-91 | 4.15 | 4.36 | Mixed | Healthy (excl pregnant) | Plasma |
| Widjaja A, Morris RJ, Levy JC, Frayn KN, Manley SE and Turner RC, 1999, Clin Chem , 45, 561-6 | 4.8 | 7.5 | Mixed | Healthy (excl pregnant) | Plasma |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 7.8 | 10.0 | Females | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 6.9 | 8.0 | Males | Healthy (excl pregnant) | Serum |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 26.0 | 37.21 | Males | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 6.6 | 8.3 | Females | Healthy (excl pregnant) | Serum |
| Williams GZ, Widdowson GM and Penton J, 1978, Clin Chem, 24, 313-20 | 7.8 | 6.8 | Males | Healthy (excl pregnant) | Serum |
| Chitto G, Fabi A, Franzini C, Galletta G, Leonardi A, Marelli M and Morelli AM, 1994, Biochim Clin, 18, 673-690 | 10.6 | | Mixed | Healthy (excl pregnant) | Serum |
| Qi Z, Chen Y, Zhang L, Ma X, Wang F, Cheng Q, Du J, Hao Y, Chi S, Cui W, 2016, Clin Chim Acta, 452, 87-91 | 4.66 | 5.26 | Mixed | Healthy (excl pregnant) | Plasma |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 5.2 | 36.26 | Mixed | Healthy (excl pregnant) | Serum |
| Thyagarajan B, Howard AG, Durazo-Arvizu R, Eckfeldt JH, Gellman MD, Kim RS, Liu K, Mendez AJ, Penedo FJ, Talavera GA, Youngblood ME, Zhao L and Sotres-Alvarez D, 2016, Clin Chim Acta, 463, 129-137 | 16.6 | 34.91 | Females | Healthy (excl pregnant) | Serum |
| Pineda-Tenor D , Laserna-Mendieta EJ, Timon-Zapata J, Rodelgo-Jimenez L, Ramos-Corral R, Recio-Montealegre A and Gomez-Serranillos Reus M, 2013, Clin Chem Lab Med, 51, 851-62 | 5.5 | 8.2 | Males | Healthy (excl pregnant) | Serum |
| Lacher DA, Hughes JP and Carroll MD, 2010, National Health Statistics Reports , 21, | 7.5 | | Mixed | Healthy (excl pregnant) | Plasma |
