An evaluation of measured and calculated serum free cortisol in a group of patients with known adrenal suppression.

Abstract:

BACKGROUND:Since more than 90% of cortisol is bound to protein, serum free cortisol (SFC) may be a more appropriate marker of adrenal status than total cortisol. However, measurement of SFC is technically difficult and calculated SFC may offer a more practical alternative. METHODS:SFC, measured by equilibrium dialysis coupled with immunoassay, and calculated using Coolens' equation from total cortisol and corticosteroid binding globulin (CBG) concentrations, was compared in short Synacthen test (SST) serum from 42 patients, of whom 20 demonstrated a suppressed adrenal response. RESULTS:Considering the patient group as a whole, calculated SFC was found to be significantly lower than measured SFC, pre- and post-Synacthen (P < 0.05 and <0.001, respectively). Upon classifying the patients as pass or fail based on total cortisol response to Synacthen, the difference in calculated and measured SFC only reached statistical significance for post-Synacthen concentrations in the pass group (P < 0.01), suggesting a greater discrepancy at higher cortisol concentrations. There was no difference in CBG levels between the pass and fail groups and both measured and calculated SFC gave a diminished 30 min response in subjects deemed to have failed the SST. CONCLUSION:Coolens' equation was found to underestimate measured SFC in this cohort of outpatients, as has been previously demonstrated, particularly in patients with a pronounced acute phase response. Although calculated SFC gave a diminished response in individuals deemed to have failed the SST, the concentration-dependent nature of the discrepancy may limit the usefulness of this method for assessing adrenal status.

journal_name

Ann Clin Biochem

authors

Barlow NL,Holme J,Stockley RA,Clark PM

doi

10.1258/acb.2010.009246

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

200-4

issue

Pt 3

eissn

0004-5632

issn

1758-1001

pii

acb.2010.009246

journal_volume

47

pub_type

杂志文章
  • An audit of management of patients with borderline increased plasma-free metanephrines.

    abstract:BACKGROUND:Measurement of plasma-free metanephrine plus normetanephrine (PFM) is the best screening test for phaeochromocytoma. While clearly raised levels are diagnostic, borderline increases may be associated with factors such as stress and medications, and should prompt a repeat study after interfering factors are w...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/acb.2010.010131

    authors: Anas SS,Vasikaran SD

    更新日期:2010-11-01 00:00:00

  • Breast cancer-associated hypercalcaemia: a reassessment of renal calcium and phosphate handling.

    abstract::The mechanisms of hypercalcaemia were assessed in 20 hypercalcaemic patients with breast cancer. Abnormalities suggestive of a PTH-related peptide (PTHrP) mechanism were observed in up to 60% of cases; urinary cyclic adenosine monophosphate (UcAMP) was elevated in nine patients (45%), renal tubular reabsorption of cal...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329002700605

    authors: Gallacher SJ,Fraser WD,Patel U,Logue FC,Soukop M,Boyle IT,Ralston SH

    更新日期:1990-11-01 00:00:00

  • Quantitative turbidimetric assay for determining myoglobin evaluated.

    abstract::A recently introduced turbidimetric immunoassay using shell/core particles for determination of myoglobin (Turbiquant Myoglobin, Behringwerke, Marburg, Germany) was evaluated on the Behring Turbitimer analyzer. Intra-assay CV varied between 1.0% and 3.2%; interassay CV was between 2.0% and 3.6%. Linear results were ob...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329102800509

    authors: Delanghe J,Chapelle JP,el Allaf M,De Buyzere M

    更新日期:1991-09-01 00:00:00

  • Elevated erythrocyte sedimentation rate and high-sensitivity C-reactive protein in osteoarthritis of the knee: relationship with clinical findings and radiographic severity.

    abstract:PURPOSE:We assessed erythrocyte sedimentation rate and high-sensitivity C-reactive protein concentration in knee osteoarthritis and non-knee osteoarthritis. In addition, we investigated potential relationship between the levels of erythrocyte sedimentation rate and high-sensitivity C-reactive protein with clinical find...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563215610142

    authors: Hanada M,Takahashi M,Furuhashi H,Koyama H,Matsuyama Y

    更新日期:2016-09-01 00:00:00

  • Alleviation of non-islet cell tumour hypoglycaemia by growth hormone therapy is associated with changes in IGF binding protein-3.

    abstract::The hypoglycaemia caused by non-islet cell tumours is often associated with an increase in plasma insulin-like activity. In many cases there is a relative if not always absolute increase in plasma insulin-like growth factor II (IGF-II). Growth hormone (GH) secretion is almost invariably depressed as is the plasma insu...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329202900312

    authors: Teale JD,Blum WF,Marks V

    更新日期:1992-05-01 00:00:00

  • A direct comparison of patient-based real-time quality control techniques: The importance of the analyte distribution.

    abstract:BACKGROUND:Patient-based real-time quality control (PBRTQC) techniques have been described in clinical chemistry for over 50 years. PBRTQC has a number of advantages over traditional quality control including commutability, cost and the opportunity for real-time monitoring. However, there are few systematic investigati...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563220902174

    authors: Smith JD,Badrick T,Bowling F

    更新日期:2020-05-01 00:00:00

  • Differential response of serum alkaline phosphatase and serum osteocalcin in Paget's osteosarcoma.

    abstract::Serum osteocalcin did not show any response to the onset of osteosarcoma in Paget's disease of bone whereas serum alkaline phosphatase increased rapidly. This suggests that osteocalcin is not useful in the diagnosis and management of Paget's osteosarcoma and does not reflect the same osteoblastic processes in bone as ...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329102800216

    authors: Davie MW,Worsfold M,Sharp CA

    更新日期:1991-03-01 00:00:00

  • Review of a pilot quality-assessment program for interpretative comments.

    abstract:BACKGROUND:Interpretative commenting constitutes an important aspect of the post-analytical phase in chemical pathology, but has only recently been the subject of quality assessment. The Royal College of Pathologists of Australasia (RCPA)-Australasian Association of Clinical Biochemists (AACB) Chemical Pathology Patien...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/0004563021901955

    authors: Vasikaran SD,Penberthy L,Gill J,Scott S,Sikaris KA

    更新日期:2002-05-01 00:00:00

  • Stabilization of circulating thyroglobulin mRNA transcripts in patients treated for differentiated thyroid carcinoma.

    abstract::Background The clinical utility of serum thyroglobulin in the follow-up of patients with differentiated thyroid carcinoma may be compromised by the presence of endogenous antithyroglobulin antibodies. To prevent interference by antithyroglobulin antibodies several groups have developed real-time PCR-based assays for q...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563216671538

    authors: Feddersen S,Bastholt L,Pedersen SM

    更新日期:2017-09-01 00:00:00

  • Serum lysophospholipase D/autotaxin may be a new nutritional assessment marker: study on prostate cancer patients.

    abstract:BACKGROUND:It is now established that the bioactive lipid lysophosphatidic acid (LPA) contributes to cancer initiation, progression and metastasis, including those of prostate cancer. LPA is produced in the serum and plasma mainly by conversion from lysophospholipids through the action of lysophospholipase D (lysoPLD),...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/000456307782268147

    authors: Nakamura K,Takeuchi T,Ohkawa R,Okubo S,Yokota H,Tozuka M,Aoki J,Arai H,Ikeda H,Ohshima N,Kitamura T,Yatomi Y

    更新日期:2007-11-01 00:00:00

  • Postprandial effect of a high fat meal on plasma lipid, lipoprotein cholesterol and apolipoprotein measurements.

    abstract::We investigated the effect of a fatty meal on plasma concentrations of lipids, apolipoproteins, and the cholesterol component of lipoproteins. Sixteen nonobese, healthy, asymptomatic males, 22-34 years of age, served as subjects for this study. None smoked, consumed more than two alcoholic drinks per day, or took any ...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329002700512

    authors: Rifai N,Merrill JR,Holly RG

    更新日期:1990-09-01 00:00:00

  • Serum albumin-adjusted glycated albumin is a better indicator of glycaemic control in diabetic patients with end-stage renal disease not on haemodialysis.

    abstract:BACKGROUNDS:Diabetic patients with end-stage renal disease who are not on haemodialysis show low concentrations of HbA1c and glycated albumin due to renal anaemia and proteinuria, respectively. In the present study, we examined whether serum albumin-adjusted glycated albumin could accurately reflect glycaemic control i...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563214568162

    authors: Fukami K,Shibata R,Nakayama H,Yamada K,Okuda S,Koga M

    更新日期:2015-07-01 00:00:00

  • High-performance liquid chromatography methods for the analysis of endogenous cortisol and cortisone in human urine: comparison of mass spectrometry and fluorescence detection.

    abstract:BACKGROUND:The analysis of steroids in biological matrices is challenging. One can apply immunoassay as well as gas and liquid chromatography with various types of detection, depending on the available equipment and the experience of the analyst. The question is how the methods are interchangeable between themselves. D...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563218783789

    authors: Kosicka K,Siemiątkowska A,Szpera-Goździewicz A,Krzyścin M,Bręborowicz G,Główka F

    更新日期:2019-01-01 00:00:00

  • Simplified gas chromatographic assay for paracetamol.

    abstract::A rapid gas liquid chromatography method has been developed which is suitable for emergency estimations of paracetamol in overdose. The method is compared with a standard ultraviolet method. ...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456327501200102

    authors: Stewart MJ,Willis RG

    更新日期:1975-01-01 00:00:00

  • The postoperative inflammatory response to injury following laparoscopic assisted vaginal hysterectomy versus abdominal hysterectomy.

    abstract::The magnitude of the inflammatory response to surgery depends on the degree of injury during surgical procedures. Laparoscopic techniques are generally associated with less postoperative pain and shorter hospital stay compared with open procedures, presumably due to less tissue injury and reduced inflammatory response...

    journal_title:Annals of clinical biochemistry

    pub_type: 临床试验,杂志文章

    doi:10.1177/000456329703400509

    authors: Labib M,Palfrey S,Paniagua E,Callender R

    更新日期:1997-09-01 00:00:00

  • A rapid anion exchange high-performance liquid chromatography method for the measurement of HbA2 in whole blood.

    abstract::We developed a binary gradient high-performance liquid chromatography (HPLC) method for measuring HbA2 in whole blood samples using a Pharmacia Mono Q column (1 mL) and measurement at 415 nm. The assay requires a simple lysis and centrifugation step before injection onto the column. We found good agreement of results ...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329603300313

    authors: Keevil BG,Maylor PW,Rowlands D

    更新日期:1996-05-01 00:00:00

  • Urinary free catecholamines--diagnostic application of an HPLC technique to the investigation of neural crest tumours.

    abstract::Experience in the use of an in-house urinary free catecholamine assay for the investigation of possible neural crest tumours in a District General Hospital laboratory is described. Elevated excretion of catecholamines and vanillylmandelic acid was found in a number of cases including phaeochromocytoma and neuroblastom...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456328702400512

    authors: Davidson DF

    更新日期:1987-09-01 00:00:00

  • Objective determination of appropriate reporting intervals.

    abstract:BACKGROUND:The reporting interval is the incremental value chosen in reporting analyte concentration. Reporting intervals for different analytes are often inappropriately narrow, when analytical imprecision and biological variability are considered. METHODS:We have used statistical techniques to determine intervals fo...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/0004563041731583

    authors: Badrick T,Wilson SR,Dimeski G,Hickman PE

    更新日期:2004-09-01 00:00:00

  • Postpartum increase of serum thioredoxin concentrations and the relation to CD8 lymphocytes.

    abstract:BACKGROUND:There are few data on oxidative stresses during and after pregnancy, although aggravation of autoimmune disease is implicated in oxidative stress and occurs frequently in the postpartum period. Thioredoxin (TRX) is a stress-inducible protein, and is used as a good biomarker for oxidative stress. To clarify t...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/acb.2009.009120

    authors: Kuroda S,Watanabe M,Santo T,Shimizuishi Y,Takano T,Hidaka Y,Kimura T,Iwatani Y

    更新日期:2010-01-01 00:00:00

  • Comparison of high sensitivity and contemporary troponin assays for the early detection of acute myocardial infarction in the emergency department.

    abstract:BACKGROUND:Current guidelines define acute myocardial infarction (AMI) by the rise and/or fall of cardiac troponin with ≥1 value above the 99th percentile. Past troponin assays have been unreliable at the lower end of the range. Highly sensitive assays have therefore been developed to increase the clinical sensitivity ...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/acb.2010.010219

    authors: Aldous SJ,Florkowski CM,Crozier IG,Elliott J,George P,Lainchbury JG,Mackay RJ,Than M,Flaws DF,Borowsky J

    更新日期:2011-05-01 00:00:00

  • Evaluation of two commercially available ELISA kits for the determination of melatonin concentrations in amniotic fluid throughout pregnancy.

    abstract::Background The aim of the present study is to evaluate the utility of extraction versus non-extraction-based commercial melatonin ELISA kits for determining the melatonin concentration in amniotic fluid obtained in early and late pregnancy. Methods Pregnancy duration less than 28 weeks was defined as early and from 28...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/0004563216645123

    authors: Bagci S,Altuntas Ö,Katzer D,Berg C,Willruth A,Reutter H,Bartmann P,Müller A,Zur B

    更新日期:2017-01-01 00:00:00

  • Auto-antibodies against oxidized LDL as a marker of coronary artery disease in patients with familial hypercholesterolaemia.

    abstract::Auto-antibodies to oxidized low-density lipoprotein (ox-LDL) are thought to play a pivotal role in the pathogenesis of atherosclerosis. This study investigates the value of auto-antibodies to ox-LDL as a predictive marker of atherosclerosis in patients with both homozygous and heterozygous familial hypercholesterolaem...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/0004563001899177

    authors: Paiker JE,Raal FJ,von Arb M

    更新日期:2000-03-01 00:00:00

  • Variation in phlebotomy techniques in emergency medicine and the incidence of haemolysed samples.

    abstract:BACKGROUND:Phlebotomy is a potential cause of preanalytical errors. We have observed phlebotomy in routine practice in a busy Emergency Department, to see how current practice compares with optimal blood sampling. METHODS:Phlebotomy episodes were audited and compared with standard procedures. A computer-based search o...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/acb.2011.011099

    authors: Berg JE,Ahee P,Berg JD

    更新日期:2011-11-01 00:00:00

  • Biochemical investigation of foetal and neonatal thyroid function using the ACS-180SE analyser: clinical application.

    abstract::Despite sonographic detection of foetal goitre, uncertainty persists in the initial diagnosis of thyrotoxicosis and hypothyroidism. The aim of this study was to establish foetal and neonatal iodothyronine and thyrotrophin reference values for the ACS-180SE analyser. From 22 to 36 weeks of gestation, median foetal seru...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456320103800509

    authors: Guibourdenche J,Noël M,Chevenne D,Vuillard E,Voluménie JL,Polak M,Boissinot C,Porquet D,Luton D

    更新日期:2001-09-01 00:00:00

  • Association of angiopoietin-like protein 3 with hepatic triglyceride lipase and lipoprotein lipase activities in human plasma.

    abstract:BACKGROUND:The relationship between plasma angiopoietin-like protein 3 (ANGPTL3), and lipoprotein lipase (LPL) activity and hepatic triglyceride lipase (HTGL) activity has not been investigated in the metabolism of remnant lipoproteins (RLPs) and high-density lipoprotein (HDL) in human plasma. METHODS:ANGPTL3, LPL act...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1258/acb.2010.009307

    authors: Nakajima K,Kobayashi J,Mabuchi H,Nakano T,Tokita Y,Nagamine T,Imamura S,Ai M,Otokozawa S,Schaefer EF

    更新日期:2010-09-01 00:00:00

  • Erythrocyte and plasma magnesium status in Nigerians with diabetes mellitus.

    abstract::Erythrocyte and fasting plasma magnesium were assayed by a dyebinding colorimetric method using the metallochromic dye, Calmagite, in 51 diabetic Nigerians and 25 controls. Erythrocyte magnesium concentrations were similar in the diabetics and the controls. Fasting plasma magnesium concentrations were significantly lo...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456328902600111

    authors: Olukoga AO,Erasmus RT,Adewoye HO

    更新日期:1989-01-01 00:00:00

  • Genetics of hyperhomocysteinaemia in cardiovascular disease.

    abstract::Homocysteine, a sulphur amino acid, is a branch-point intermediate of methionine metabolism. It can be degraded in the transsulphuration pathway to cystathionine, or remethylated to methionine via the remethylation pathway. In both pathways, major genetic defects that cause enzyme deficiencies are associated with very...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章,评审

    doi:10.1258/000456303321016169

    authors: Lievers KJ,Kluijtmans LA,Blom HJ

    更新日期:2003-01-01 00:00:00

  • Measurement of markers of tobacco smoking in patients with coronary heart disease.

    abstract::591 patients with a history of coronary heart disease had one or more biochemical markers of tobacco smoking measured. 26% were self reported smokers and a further 4% were apparent 'smoking deceivers'. The urinary nicotine metabolite concentration is an excellent marker for tobacco smoking; breath CO would be a suitab...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329503200213

    authors: Archbold GP,Cupples ME,McKnight A,Linton T

    更新日期:1995-03-01 00:00:00

  • A comparison of three methods for the estimation of capillary blood glucose in filter paper spots.

    abstract::A comparison has been made between three methods for measuring capillary blood glucose collected on filter paper, including a new method using a Beckman glucose analyser 2. The methods are suitable for use with capillary blood spots collected onto filter paper for monitoring the control of diabetic patients. Their acc...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456328201900105

    authors: Taylor RP,Pennock CA

    更新日期:1982-01-01 00:00:00

  • The entero-insular axis in polycystic ovarian syndrome.

    abstract::We investigated the contributions made by the entero-insular axis, proinsulin and the fractional hepatic extraction of insulin to the hyperinsulinaemia characteristic of polycystic ovarian syndrome (PCOS). We measured plasma glucose, gastric inhibitory polypeptide (GIP), glucagon-like peptide-1 (7-36 amide) (GLP-1(7-3...

    journal_title:Annals of clinical biochemistry

    pub_type: 杂志文章

    doi:10.1177/000456329603300303

    authors: Gama R,Norris F,Wright J,Morgan L,Hampton S,Watkins S,Marks V

    更新日期:1996-05-01 00:00:00