Reference methods for total cholesterol and total glycerolSIEKMANN, L.Fresenius' Zeitschrift für analytische Chemie. 1990, Vol 337, Num 1, pp 10-11, issn 0016-1152, 2 p.Conference Paper

Determination of uric acid in human serum by isotope dilution-mass spectrometry: definitive methods in clinical chemistry. IIISIEKMANN, L.Journal of clinical chemistry and clinical biochemistry. 1985, Vol 23, Num 3, pp 129-135, issn 0340-076XArticle

Determination of creatinine in human serum by isotope dilution-mass spectrometry: definitive methods in clinical chemistry. IVSIEKMANN, L.Journal of clinical chemistry and clinical biochemistry. 1985, Vol 23, Num 3, pp 137-144, issn 0340-076XArticle

Determination of oestradiol-17β in human serum by isotope dilution-mass spectrometry: definitive methods in clinical chemistry. IISIEKMANN, L.Journal of clinical chemistry and clinical biochemistry. 1984, Vol 22, Num 8, pp 551-557, issn 0340-076XArticle

Establishing measurement traceability in clinical chemistrySIEKMANN, L.Accreditation and quality assurance. 2004, Vol 9, Num 1-2, pp 5-17, issn 0949-1775, 13 p.Article

Measurement of thyroxine in human serum by isotope dilution mass spectrometry: definitive methods in clinical chemistry. VSIEKMANN, L.Biomedical & environmental mass spectrometry. 1987, Vol 14, Num 11, pp 683-688, issn 0887-6134Article

DETERMINATION OF CORTISOL IN HUMAN PLASMA BY ISOTOPE DILUTION-MASS SPECTROMETRYSIEKMANN L; BREUER H.1982; JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY; ISSN 0340-076X; DEU; DA. 1982; VOL. 20; NO 12; PP. 883-892; ABS. GER; BIBL. 9 REF.Article

BIOSYNTHESIS AND METABOLISM OF 16ALPHA , 17-EPOXY-C₂₁-STEROIDS IN RAT LIVER MICROSOMESSIEKMANN L; DISSE B; BREVER H et al.1980; J. STEROID BIOCHEM.; ISSN 0022-4731; GBR; DA. 1980; VOL. 13; NO 10; PP. 1181-1205; BIBL. 12 REF.Article

MEASUREMENT BY ISOTOPE DILUTION MASS SPECTROMETRY OF 17ALPHA -ETHYNYLOESTRADIOL-17 BETA AND NORETHISTERONE IN SERUM OF WOMEN TAKING ORAL CONTRACEPTIVESSIEKMANN L; SIEKMANN A; BREUER H et al.1980; BIOMED. MASS SPECTROM.; ISSN 0306-042X; GBR; DA. 1980; VOL. 7; NO 11-12; PP. 511-514; BIBL. 4 REF.Article

STOFFWECHSEL VON OESTRON IN DER MIKROSOMENFRAKTION DER RATTENLEBER = METABOLISME DE L'OESTRONE DANS LA FRACTION MICROSOMALE DU FOIE DE RATHOPPEN HO; SIEKMANN L; BREUER H et al.1974; Z. (HOPPE-SEYLER'S) PHYSIOL. CHEM.; DTSCH.; DA. 1974; VOL. 355; NO 10; PP. 1305-1315; ABS. ANGL.; BIBL. 32REF.Article

BIOSYNTHESIS OF 16ALPHA ,17ALPHA -EPOXY-4-ANDROSTEN-3-ONE IN RAT LIVER MICROSOMESDISSE B; SIEKMANN L; BREUER H et al.1980; ACTA ENDOCRINOL. (KBH.); ISSN 0001-5598; DNK; DA. 1980; VOL. 95; NO 1; PP. 58-66; BIBL. 23 REF.Article

BIOSYNTHESIS OF 16ALPHA ,17ALPHA -EPOXY-OESTRATIENOL IN RAT LIVER MICROSOMESSIEKMANN L; THULL P; BREUER H et al.1980; ACTA ENDOCRINOL. (KBH.); ISSN 0001-5598; DNK; DA. 1980; VOL. 95; NO 1; PP. 49-57; BIBL. 10 REF.Article

MEASUREMENT OF ETHYNYLOESTRADIOL BY RADIOIMMUNOASSAY AND BY ISOTOPE DILUTION-MASS SPECTROMETRYFOTHERBY K; AKPOVIRORO JO; SIEKMANN L et al.1981; J. STEROIDS BIOCHEM.; ISSN 0022-4731; GBR; DA. 1981; VOL. 14; NO 5; PP. 499-500; BIBL. 18 REF.Article

Measurement of urea in human serum by isotope dilution mass spectrometry : A reference procedureKESSLER, A; SIEKMANN, L.Clinical chemistry (Baltimore, Md.). 1999, Vol 45, Num 9, pp 1523-1529, issn 0009-9147Conference Paper

MEASUREMENT BY ISOTOPE DILUTION MASS SPECTROMETRY OF EQUILINE AND OESTRONE IN SERUM OF WOMEN TAKING TABLETS OF EQUINE OESTROGENSSIEKMANN L; SIEKMANN A; BREUER H et al.1983; BIOMEDICAL MASS SPECTROMETRY; ISSN 0306-042X; GBR; DA. 1983; VOL. 10; NO 3; PP. 168-174; BIBL. 10 REF.Article

MASS-SPECTROMETRY OF STEROID GLUCURONIDES.SPIEGELHALDER B; ROEHLE G; SIEKMANN L et al.1976; J. STEROID BIOCHEM.; G.B.; DA. 1976; VOL. 7; NO 10; PP. 749-756; BIBL. 5 REF.Article

STEROIDS IN URINE OF THE NEWBORN HUMAN = LES STEROIDES DANS L'URINE DU NOUVEAU-NE HUMAINSCHINDLER AE; WUCHTER J; HOPPEN HO et al.1974; J. CLIN. ENDOCRINOL. METABOL.; U.S.A.; DA. 1974; VOL. 39; NO 2; PP. 334-339; BIBL. 29REF.Serial Issue

RINGVERSUCHE FUER STEROIDHORMONBESTIMMUNGEN: RICHTIGKEIT UND PRAEZISION DER ANALYSENERGEBNISSE = CONTROLE DE QUALITE DU DOSAGE DES HORMONES STEROIDES: EXACTITUDE ET PRECISION DES RESULTATSROEHLE G; VOIGT U; SIEKMANN L et al.1983; JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY; ISSN 0340-076X; DEU; DA. 1983; VOL. 21; NO 3; PP. 157-165; ABS. ENG; BIBL. 13 REF.Article

Influence of oral dehydroepiandrosterone (DHEA) on urinary steroid metabolites in males and femalesCALLIES, F; ARLT, W; SIEKMANN, L et al.Steroids. 2000, Vol 65, Num 2, pp 98-102, issn 0039-128XArticle

Analytical specifications of reference methods compilation and critical discussionSTÖCKL, D; FRANZINI, C; KRATOCHVILA, J et al.European journal of clinical chemistry and clinical biochemistry. 1996, Vol 34, Num 4, pp 319-337, issn 0939-4974Article

Networks of reference laboratoriesSIEKMANN, L; DOUMAS, B. T; THIENPONT, L et al.European journal of clinical chemistry and clinical biochemistry. 1995, Vol 33, Num 12, pp 1013-1017, issn 0939-4974Conference Paper

Standardization of hapten immunoprocedures : total cortisolGOSLING, J. P; MIDDLE, J; SIEKMANN, L et al.Scandinavian journal of clinical & laboratory investigation. Supplement. 1993, Vol 53, Num 216, pp 3-41, issn 0085-591XConference Paper

Development validation, and certification by isotope dilution gas chromatography-mass spectrometry of lyophilized human serum reference materials for cortisol (CRM 192 and 193) and progesterone (CRM 347 and 348)THIENPONT, L; SIEKMANN, L; LAWSON, A et al.Clinical chemistry (Baltimore, Md.). 1991, Vol 37, Num 4, pp 540-546, issn 0009-9147, 7 p.Article

Suramin in adrenocortical cancer : limited efficacy and serious toxicityARIT, W; REINCKE, M; SIEKMANN, L et al.Clinical endocrinology (Oxford. Print). 1994, Vol 41, Num 3, pp 299-307, issn 0300-0664Article

Quatitative mass spectrometry in clinical chemistrySIEKMANN, L; KRUSE, R; ROHLE, G et al.Mikrochimica acta (1966. Print). 1991, Vol 2, Num 1-6, pp 145-155, issn 0026-3672Conference Paper