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Reference Ranges in Pregnancy

Published online by Cambridge University Press:  08 March 2019

Tauqeer Husain
Ashford and St Peter’s NHS Foundation Trust, Surrey
Roshan Fernando
Womens Wellness and Research Centre, Hamad Medical Corporation, Qatar
Scott Segal
Wake Forest University, North Carolina
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Obstetric Anesthesiology
An Illustrated Case-Based Approach
, pp. 274 - 294
Publisher: Cambridge University Press
Print publication year: 2019

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Bromage, PR. Epidural Analgesia. Philadelphia, PA: Saunders; 1978: 14.Google Scholar
Larsson, A, Palm, M, Hansson, L-O, et al. Reference values for clinical chemistry tests during normal pregnancy. BJOG 2008; 115:874 [PMID: 18485166].CrossRefGoogle ScholarPubMed
Lockitch, G. Handbook of Diagnostic Biochemistry and Hematology in Normal Pregnancy. Boca Raton, FL: CRC Press; 1993.Google Scholar
Van Buul, EJA, Steegers, EAP, Jongsma, HW, et al. Haematological and biochemical profile of uncomplicated pregnancy in nulliparous women; a longitudinal study. Neth J Med 1995; 46:73.CrossRefGoogle ScholarPubMed
Bacq, Y, Zarka, O, Bréchot, JF, et al. Liver function tests in normal pregnancy: a prospective study of 102 pregnant women and 102 matched controls. Hepatology 1996; 23:1030 [PMID: 8621129].CrossRefGoogle Scholar
Ardawi, MSM, Nasrat, HAN, BA’Aqueel, HS. Calcium-regulating hormones and parathyroid hormone-related peptide in normal human pregnancy and postpartum: a longitudinal study. Eur J Endocrinol 1997; 137:402 [PMID: 9368509].CrossRefGoogle ScholarPubMed
Handwerker, SM, Altura, BT, Altura, BM. Serum ionized magnesium and other electrolytes in the antenatal period of human pregnancy. J Am Coll Nutr 1996; 15:36 [PMID: 8632112].CrossRefGoogle ScholarPubMed
Hytten, FE, Lind, T. Diagnostic Indices in Pregnancy. Summit, NJ, CIBA-GEIGY; 1975.Google Scholar
Karsenti, D, Bacq, Y, Bréchot, JF, et al. Serum amylase and lipase activities in normal pregnancy: a prospective case-control study. Am J Gastroenterol 2001; 96:697 [PMID: 11280536].Google ScholarPubMed
Strickland, DM, Hauth, JC, Widish, J, et al. Amylase and isoamylase activities in serum of pregnant women. Obstet Gynecol 1984; 63:389 [PMID: 6199704].Google ScholarPubMed
Carter, J. Serum bile acids in normal pregnancy. BJOG 1991; 98:540 [PMID: 1873244].CrossRefGoogle ScholarPubMed
Spitzer, M, Kaushal, N, Benjamin, F. Maternal CA-125 levels in pregnancy and the puerperium. J Reprod Med 1998; 43:387.Google ScholarPubMed
Aslam, N, Ong, C, Woelfer, B, et al. Serum CA-125 at 11–14 weeks of gestation in women with morphologically normal ovaries. BJOG 2000; 107:689.CrossRefGoogle ScholarPubMed
Jacobs, IJ, Fay, TN, Stabile, I, et al. The distribution of CA 125 in the reproductive tract of pregnant and non-pregnant women. Br J Obstet Gynaecol 1988; 95:1190.CrossRefGoogle ScholarPubMed
Mimouni, F, Tsang, RC, Hertzbert, VS, et al: Parathyroid hormone and calcitriol changes in normal and insulin-dependent diabetic pregnancies. Obstet Gynecol 1989; 74:49 [PMID: 2733941].Google ScholarPubMed
Pitkin, RM, Gebhardt, MP. Serum calcium concentrations in human pregnancy. Am J Obstet Gynecol 1977; 127:775 [PMID: 848531].CrossRefGoogle ScholarPubMed
Shakhmatova, EI, Osipova, NA, Natochin, YV. Changes in osmolality and blood serum ion concentrations in pregnancy. Hum Physiol 2000; 26:92.CrossRefGoogle Scholar
Louro, MO, Cocho, JA, Tutor, JC. Assessment of copper status in pregnancy by means of determining the specific oxidase activity of ceruloplasmin. Clin Chim Acta 2001; 312:123 [PMID: 11580917].CrossRefGoogle ScholarPubMed
Dux, S, Yaron, A, Carmel, A, et al. Renin, aldosterone, and serum-converting enzyme activity during normal and hypertensive pregnancy. Gynecol Obstet Invest 1984; 17:252 [PMID: 6329926].CrossRefGoogle ScholarPubMed
Parente, JV, Franco, JG, Greene, LJ, et al. Angiotensin-converting enzyme: serum levels during normal pregnancy. Am J Obstet Gynecol 1979; 135:586 [PMID: 228554].CrossRefGoogle ScholarPubMed
Davidson, JB, Vallotton, MB, Lindheimer, MD. Plasma osmolality and urinary concentration and dilution during and after pregnancy: evidence that lateral recumbency inhibits maximal urinary concentrating ability. BJOG 1981; 88:472 [PMID: 7236550].CrossRefGoogle Scholar
Kato, T, Seki, K, Matsui, H, et al. Monomeric calcitonin in pregnant women and in cord blood. Obstet Gynecol 1998; 92:241 [PMID: 9699759].Google ScholarPubMed
Singh, HJ, Mohammad, NH, Nila, A. Serum calcium and parathormone during normal pregnancy in Malay women. J Matern Fetal Med 1999; 8:95 [PMID: 10338062].Google ScholarPubMed
Rang, S, van Montfrans, GA, Wolf, H. Serial hemodynamic measurement in normal pregnancy, preeclampsia, and intrauterine growth restriction. Am J Obstet Gynecol 2008; 198(5):519.e1–9 [PMID: 18279824].CrossRefGoogle ScholarPubMed
Moertl, MG, Ulrich, D, Pickel, K, et al. Changes in haemodynamic and autonomous nervous system parameters measured non-invasively throughout normal pregnancy. Eur J Obstet Gynecol Reprod Biol 2009; 144(Suppl 1): S179-83 [PMID: 19285779].CrossRefGoogle ScholarPubMed
Pandey, AK, Das, A, Srinivas, C, et al. Maternal myocardial performances in various stages of pregnancy and post-partum. Res J Cardiol 2010; 3(1):916.Google Scholar
Lees, M. Central circulatory responses in normotensive and hypertensive pregnancy. Postgrad Med J 1979; 55(643):311–14 [PMCID: PMC2425449].CrossRefGoogle ScholarPubMed
Poppas, A, Shroff, SG, Korcarz, CE, et al. Serial assessment of the cardiovascular system in normal pregnancy: role of arterial compliance and pulsatile arterial load. Circulation 1997; 95:2407–15.CrossRefGoogle ScholarPubMed
Katz, R, Karliner, JS, Resnik, R. Effects of a natural volume overload state (pregnancy) on left ventricular performance in normal human subjects. Circulation 1978; 58:434–41.CrossRefGoogle ScholarPubMed
Mesa, A, Jessurun, C, Hernandez, A, et al. Left ventricular diastolic function in normal human pregnancy. Circulation 1999; 99:511–17.CrossRefGoogle ScholarPubMed
Savu, O, Jurcuţ, R, Giuşcă, S, et al. Morphological and functional adaptation of the maternal heart during pregnancy. Circ Cardiovasc Imaging 2012; 5:289.CrossRefGoogle ScholarPubMed
Vitarelli, A, Capotosto, L. Role of echocardiography in the assessment and management of adult congenital heart disease in pregnancy. Int J Cardiovasc Imaging 2011; 27:843.CrossRefGoogle ScholarPubMed
Borghi, CB, Esposti, DD, Immordino, V, et al. Relationship of systemic hemodynamics, left ventricular structure and function, and plasma natriuretic peptide concentrations during pregnancy complicated by preeclampsia. Am J Obstet Gynecol 2000; 183:140 [PMID: 10920322].CrossRefGoogle ScholarPubMed
Resnik, JL, Hong, C, Resnik, R, et al. Evaluation of B-type natriuetic peptide (BNP) levels in normal and preeclamptic women. Am J Obstet Gynecol 2005; 193:450–58.CrossRefGoogle Scholar
Hamid, RR, Larsson, A, Pernow, J, et al. Assessment of left ventricular structure and function in preeclampsia by echocardiography and cardiovascular biomarkers. J Hypertens 2009; 27:2257-64.Google Scholar
Leiserowitz, GS, Evans, AT, Samuels, SJ, et al. Creatine kinase and its MB isoenzyme in the third trimester and the peripartum period. J Reprod Med 1992; 37:910 [PMID: 1460608].Google ScholarPubMed
Koscica, KL, Bebbington, M, Bernstein, PS. Are maternal serum troponin I levels affected by vaginal or cesarean delivery? Am J Perinatol 2004; 21(1):31.Google ScholarPubMed
Shivvers, SA, Wians, FH, Keffer, JH, et al. Maternal cardiac troponin I levels during labor and delivery. Am J Obstet Gynecol 1999; 180:122 [PMID: 9914590].CrossRefGoogle ScholarPubMed
Association of Anaesthetists of Great Britain and Ireland (AAGBI) . AAGBI Safety Guideline: Management of Suspected Anaphylaxis, 2009. Available at (accessed October 22, 2018).
Association of Anaesthetists of Great Britain and Ireland (AAGBI). AAGBI Safety Guideline: Management of Severe Local Anaesthetic Toxicity, 2010. Available at (accessed October 22, 2018).
Thurlow, JA, Kinsella, SM. Intrauterine resuscitation: active management of fetal distress. Int J Obstet Anaesth 2002; 11:105.CrossRefGoogle ScholarPubMed
Greentop Guideline 52. Prevention and Management of PPH, 2016. Available at (accessed October 22, 2018).
Apgar, V. A proposal for a new method of evaluation of the newborn infant. Can Res Anaesth Analg 1953; 32(4):260–67.Google ScholarPubMed
Intrapartum Care for Healthy Women and Babies: NICE Clinical Practice Guideline, December 3, 2014. Available at (accessed October 18, 2018).
Yeomans, ER, Hauth, JC, Gilstrap, LC III, Stckland, DM. Umbilical cord pH, PCO2 and bicarbonate following uncomplicated term vaginal deliveries. Am J Obstet Gynecol 1985; 151:798800.CrossRefGoogle ScholarPubMed
NICE Guideline: Intrapartum Care, February 2017. Available at
Beguin, Y, Lipscei, G, Thourmsin, H, et al. Blunted erythropoietin production and decreased erythropoiesis in early pregnancy. Blood 1991; 78(1):89.Google ScholarPubMed
Bianco, I, Mastropietro, F, D’Aseri, C, et al. Serum levels of erythropoietin and soluble transferrin receptor during pregnancy in non-β-thalassemic and β-thalassemic women. Haematologica 2000; 85:902 [PMID: 10980626].Google ScholarPubMed
Milman, N, Graudal, N, Nielsen, OJ. Serum erythropoietin during normal pregnancy: relationship to hemoglobin and iron status markers and impact of iron supplementation in a longitudinal, placebo-controlled study on 118 women. Int J Hematol 1997; 66:159 [PMID: 9277046].CrossRefGoogle Scholar
Milman, N, Bergholt, T, Byg, KE, et al. Reference intervals for haematological variables during normal pregnancy and postpartum in 434 healthy Danish women. Eur J Haematol 2007; 79:39 [PMID: 17598837].CrossRefGoogle ScholarPubMed
Romslo, I, Haram, K, Sagen, N, et al. Iron requirement in normal pregnancy as assessed by serum ferritin, serum transferring saturation and erythrocyte protoporphyrin determinations. Br J Obstet Gynaecol 1983; 90:101 [PMID: 6824608].CrossRefGoogle Scholar
Milman, N, Byg, KE, Hvas, AM, et al. Erythrocyte folate, plasma folate and plasma homocysteine during normal pregnancy and postpartum: a longitudinal study comprising 404 Danish women. Eur J Haematol 2006; 76:200 [PMID: 16412135].CrossRefGoogle ScholarPubMed
Walker, MC, Smith, GN, Perkins, SL, et al. Changes in homocysteine levels during normal pregnancy. Am J Obstet Gynecol 1999; 180:660 [PMID: 10076144].CrossRefGoogle ScholarPubMed
López-Quesada, E, Vilaseca, MA, Lailla, JM. Plasma total homocysteine in uncomplicated pregnancy and in preeclampsia. Eur J Obstet Gynecol Reprod Biol 2003; 108:45 [PMID: 19899161].CrossRefGoogle ScholarPubMed
Özerol, E, Özerol, I, Gökdeniz, R, et al. Effect of smoking on serum concentrations of total homocysteine, folate, vitamin B12, and nitric oxide in pregnancy: a preliminary study. Fetal Diagn Ther 2004; 19:145.CrossRefGoogle ScholarPubMed
Qvist, I, Abdulla, M, Jägerstad, M, et al. Iron, zinc and folate status during pregnancy and two months after delivery. Acta Obstet Gynaecol Scand 1986; 65:15 [PMID: 3716775].CrossRefGoogle ScholarPubMed
Balloch, AJ, Cauchi, MN. Reference ranges for haematology parameters in pregnancy derived from patient populations. Clin Lab Haematol 1993; 15:7 [PMID: 8472501].CrossRefGoogle ScholarPubMed
AzizKarim, S, Khurshid, M, Rizvi, JH, et al. Platelets and leucocyte counts in pregnancy. J Pak Med Assoc 1992; 42:86.Google Scholar
Choi, JW, Pai, SH. Tissue plasminogen activator levels change with plasma fibrinogen concentrations during pregnancy. Ann Hematol 2002; 81:611 [PMID: 12454697].Google ScholarPubMed
Belo, L, Santos-Silva, A, Rocha, S, et al. Fluctuations in C-reactive protein concentration and neutrophil activation during normal human pregnancy. Eur J Obstet Gynecol Reprod Biol 2005; 123:46 [PMID: 16260340].CrossRefGoogle ScholarPubMed
Cerneca, F, Ricci, G, Simeone, R, et al. Coagulation and fibrinolysis changes in normal pregnancy increased levels of procoagulants and reduced levels of inhibitors during pregnancy induce a hypercoagulable state, combined with a reactive fibrinolysis. Eur J Obstet Gynecol Reprod Biol 1997; 73:31 [PMID: 9175686].CrossRefGoogle ScholarPubMed
Lattuada, A, Rossi, E, Calzarossa, C, et al. Mild to moderate reduction of a von Willebrand factor cleaving protease (ADAMTS-13) in pregnant women with HELLP microangiopathic syndrome. Haematologica 2003; 88(9):1029.Google ScholarPubMed
Francalanci, I, Comeglio, P, Liotta, AA, et al. D-Dimer concentrations during normal pregnancy, as measured by ELISA. Thromb Res 1995; 78:399 [PMID: 7660356].CrossRefGoogle ScholarPubMed
Kline, JA, Williams, GW, Hernandez-Nino, J. D-Dimer concentrations in normal pregnancy: new diagnostic thresholds are needed. Clin Chem 2005; 51:825 [PMID: 15764641].CrossRefGoogle ScholarPubMed
Morse, M. Establishing a normal range for D-dimer levels through pregnancy to aid in the diagnosis of pulmonary embolism and deep vein thrombosis. J Thromb Haemost 2004; 2:1202 [PMID: 15219216].CrossRefGoogle Scholar
Liu, XH, Jiang, YM, Shi, H, et al. Prospective, sequential, longitudinal study of coagulation changes during pregnancy in Chinese women. Int J Gynaecol Obstet 2009; 105(3):240.CrossRefGoogle ScholarPubMed
Hale, SA, Sobel, B, Benvenuto, A, et al. Coagulation and fibrinolytic system protein profiles in women with normal pregnancies and pregnancies complicated by hypertension. Pregnancy Hypertens 2012; 2:152.CrossRefGoogle ScholarPubMed
Lefkowitz, JB, Clarke, SH, Barbour, LA. Comparison of protein S functional and antigenic assays in normal pregnancy. Am J Obstet Gynecol 1996; 175:657 [PMID: 8828430].CrossRefGoogle ScholarPubMed
Faught, W, Garner, P, Jones, G, et al. Changes in protein C and protein S levels in normal pregnancy. Am J Obstet Gynecol 1995; 172:147 [PMID: 7847526].CrossRefGoogle ScholarPubMed
Wickström, K, Edelstam, G, Löwbeer, CH, et al. Reference intervals for plasma levels of fibronectin, von Willebrand factor, free protein S and antithrombin during third-trimester pregnancy. Scand J Clin Lab Invest 2004; 64:31 [PMID: 13035697].CrossRefGoogle ScholarPubMed
Mannucci, PM, Canciani, MT, Forza, I, et al. Changes in health and disease of the metalloprotease that cleaves von Willebrand factor. Blood 2001; 98(9):2730.CrossRefGoogle ScholarPubMed
Macafee, B, Campbell, JP, Ashpole, K, et al. Reference ranges for thromboelastography (TEG) and traditional coagulation tests in term parturient undergoing caesarean section under spinal anaesthesia. Anaesthesia 2012; 67:741–47.CrossRefGoogle Scholar
Armstrong, S, Fernando, R, Ashpole, K, et al. Assessment of coagulation in the obstetric population using ROTEM thromboelastometry. Int J Obstet Anaesth 2011; 20:293–98.CrossRefGoogle Scholar
Belo, L, Caslake, M, Gaffney, D, et al. Changes in LDL size and HDL concentration in normal and preeclamptic pregnancies. Atherosclerosis 2002; 162:425 [PMID: 11996963].CrossRefGoogle ScholarPubMed
Desoye, G, Schweditsch, MO, Pfeiffer, KP, et al. Correlation of hormones with lipid and lipoprotein levels during normal pregnancy and postpartum.J Clin Endocrinol Metab 1987; 64:704 [PMID: 3546352].CrossRefGoogle ScholarPubMed
Jimenez, DM, Pocovi, M, Ramon-Cajal, J, et al. Longitudinal study of plasma lipids and lipoprotein cholesterol in normal pregnancy and puerperium. Gynecol Obstet Invest 1988; 25:158 [PMID: 3391425].CrossRefGoogle ScholarPubMed
Piechota, W, Staszewski, A. Reference ranges of lipids and apolipoproteins in pregnancy. Eur J Obstet Gynecol Reprod Biol 1992; 45:27 [PMID: 1618359].CrossRefGoogle ScholarPubMed
Montelongo, A, Lasunción, MA, Pallardo, LF, et al. Longitudinal study of plasma lipoproteins and hormones during pregnancy in normal and diabetic women. Diabetes 1992; 41:1651 [PMID: 1446807].CrossRefGoogle ScholarPubMed
Elsheikh, A, Creatsas, G, Mastorakos, G, et al. The renin-aldosterone system during normal and hypertensive pregnancy. Arch Gynecol Obstet 2001; 264:182 [PMID: 11205704].CrossRefGoogle ScholarPubMed
Kim, EH, Lim, JH, Kim, YH, et al. The relationship between aldosterone to renin ratio and RI value of the uterine artery in the preeclamptic patient vs. normal pregnancy. Yonsei Med J 2008; 49(1):138.CrossRefGoogle ScholarPubMed
Suri, D, Moran, J, Hibbard, JU, et al. Assessment of adrenal reserve in pregnancy: defining the normal response to the adrenocorticotropin stimulation test. J Clin Endocrinol Metab 2006; 91:3866 [PMID: 16895954].CrossRefGoogle ScholarPubMed
Kratz, A, Pesce, MA, Basner, RC, Einstein, AJ. Appendix: laboratory values of clinical importance, in Longo, DL, Fauci, AS, Kasper, DL, et al. (eds.), Harrison’s Principles of Internal Medicine (18th edn). New York, NY: McGraw-Hill; 2012, App. 1, p. A1.Google Scholar
Leek, AE, Ruoss, CF, Kitau, MJ, Chard, T. Maternal plasma alpha-fetoprotein levels in the second half of normal pregnancy: relationship to fetal weight, and maternal age and parity. Br J Obstet Gynaecol 1975; 82(8):66973.CrossRef
Radder, JK, Van Roosmalen, J. HbAIC in healthy, pregnant women. Neth J Med 2005; 63:256 [PMID: 16093576].Google Scholar
Price, A, Obel, O, Cresswell, J, et al. Comparison of thyroid function in pregnant and non-pregnant Asian and western Caucasian women. Clin Chim Acta 2001; 208:91.CrossRefGoogle Scholar
Stagnaro-Green, A, Abalovich, M, Alexander, E, et al. Guidelines of the American Thyroid Association for the diagnosis and management of thyroid disease during pregnancy and postpartum. Thyroid 2011; 21:1081.CrossRefGoogle ScholarPubMed
Fadel, HE, Northrop, G, Misenhimer, HR, et al. Acid-base determinations in amniotic fluid and blood of normal late pregnancy. Obstet Gynecol 1979; 53:99 [PMID: 32503].Google ScholarPubMed
Spiropoulos, K, Prodromaki, E, Tsapanos, V. Effect of body position on PaO2 and PaCO2 during pregnancy. Gynecol Obstet Invest 2004; 58:22 [PMID: 15028865].CrossRefGoogle ScholarPubMed
International Headache Society. Classification of Headache Disorders, 2018. Available at (accessed October 312, 2018).
World Federation of Neurological Surgeons. Grading System for Subarachnoid Haemorrhage, 2011. Available at (accessed October 31, 2018).
National Institute of Neurological Disorders and Stroke. Chiari Malformation Information Page, 2016. Available at (accessed October 31, 2018).
Public Health England. Measurement of Obesity, 2014. Available at (last accessed October 31, 2018)
RCOG Green Top Guideline 63: Risk Factors for Placental Abruption, 2011. Available at (accessed October 31, 2018).
Dunlop, W. Serial changes in renal haemodynamics during normal human pregnancy. Br J Obstet Gynaecol 1981; 88:1 [PMID: 7459285].CrossRefGoogle ScholarPubMed
Ezimokhai, M, Davison, JM, Philips, PR, et al. Non-postural serial changes in renal function during the third trimester of normal human pregnancy. Br J Obstet Gynaecol 1981; 88:465 [PMID: 7236549].CrossRefGoogle ScholarPubMed
Moran, P, Baylis, PH, Lindheimer, J, et al. Glomerular ultrafiltration in normal and preeclamptic pregnancy. J Am Soc Nephrol 2003; 14:648 [PMID: 12595500].CrossRefGoogle ScholarPubMed
Risberg, A, Larsson, A, Olsson, K, et al. Relationship between urinary albumin and albumin/creatinine ratio during normal pregnancy and pre-eclampsia. Scand J Clin Lab Invest 2004; 64:17 [PMID: 15025425].CrossRefGoogle ScholarPubMed
Higby, K, Suiter, CR, Phelps, JY, et al. Normal values of urinary albumin and total protein excretion during pregnancy. Am J Obstet Gynecol 1994; 171:984 [PMID: 7943114].CrossRefGoogle ScholarPubMed
Pregnancy in renal transplant recipientsNephrol Dial Transplant 2002; 17(Suppl 4):5055. Available at (accessed October 31, 2018).CrossRef
Gazioglu, K, Kaltreider, NL, Rosen, M, et al. Pulmonary function during pregnancy in normal women and in patients with cardiopulmonary disease. Thorax 1970; 25:445–50.CrossRefGoogle ScholarPubMed
Green Top Guideline 26: Operative Vaginal Delivery, 2011. Available at (accessed October 31, 2018).
World Health Organization. WHO Safer Childbirth Checklist, 2015. Available at (accessed October 31, 2018).
Lucas, DN, Yentis, SM, Kinsella, SM, et al. Urgency of caesarean section: a new classification. J R Soc Med 2000; 93:346–50.CrossRefGoogle ScholarPubMed
Depuis, O, Sayegh, IDecullier, E, et al. Red, orange and green caesarean sections: a new communication tool for on-call obstetricians. Eur J Obstet Gynecol Reprod Biol 2008; 140:206–11.Google Scholar
Macrae, WA. Chronic post-surgical pain: 10 years on. Br J Anaesth 2008; 101:7786.CrossRefGoogle Scholar
Álvarez, SI, Castañón, SG, Ruata, MLC, et al. Updating of normal levels of copper, zinc and selenium in serum of pregnant women. J Trace Elem Med Biol 2007; 21(S1):49.CrossRefGoogle Scholar
Ilhan, N, Ilhan, N, Simsek, M. The changes of trace elements, malondialdehyde levels and superoxide dismutase activities in pregnancy with or without preeclampsia. Clin Biochem 2002; 35:393 [PMID: 12270770].CrossRefGoogle ScholarPubMed
Sharma, SC, Sabra, A, Molloy, A, et al. Comparison of blood levels of histamine and total ascorbic acid in pre-eclampsia with normal pregnancy. Hum Nutr Clin Nutr 1984; 38C:3.Google Scholar
Reiter, EO, Braunstein, GD, Vargas, A, et al. Changes in 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D during pregnancy. Am J Obstet Gynecol 1979; 135:227 [PMID: 474676].CrossRefGoogle ScholarPubMed

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