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Serum amyloid A (SAA) protein and high-sensitivity C-reactive protein (hsCRP) in healthy newborn infants and healthy young through elderly adults
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Infectious Diseases. (Friman)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Infectious Diseases. (Friman)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health. (Barnendokrinologisk forskning/Tuvemo)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences. (Akut- och internmedicin)
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2005 (English)In: Acta Paediatrica, ISSN 0803-5253, E-ISSN 1651-2227, Vol. 94, no 9, 1198-1202 p.Article in journal (Refereed) Published
Abstract [en]

AIM:

To determine the levels of serum amyloid A (SAA) protein and high-sensitivity C-reactive protein (hsCRP) in different age groups.

METHODS:

Serum samples from 70 healthy newborn infants, 80 blood donors and 81 healthy elderly individuals were analysed using a nephelometric method. The 231 samples were grouped as follows: 35 umbilical cords, 35 newborns, 48 young adults, 28 middle-aged adults, and 85 elderly adults.

RESULTS:

Serum levels of both SAA and hsCRP were lower in umbilical cords than in the newborns and young, middle-aged and elderly adults (p<0.0001). The SAA and hsCRP levels were comparable in newborns, and young and middle-age adults, but higher in elderly adults (p<0.0001-0.03). SAA (r2=0.159, p<0.0001) and hsCRP (r2=0.059, p<0.0001) were positively correlated with age and to each other (r2=0.385, p<0.0001).

CONCLUSION:

Serum levels of SAA and hsCRP in umbilical cord blood are close to the detection limit and lower than in the other age groups investigated. The elderly have generally higher levels than the younger age groups, which require higher decision levels in inflammatory diseases, including infections. In newborns and young and middle-aged adults, the lower decision levels of 10 mg/l for SAA and 5 mg/l for CRP are suggested.

Place, publisher, year, edition, pages
2005. Vol. 94, no 9, 1198-1202 p.
Keyword [en]
Adult, Age Factors, Aged, C-Reactive Protein/*analysis, Female, Fetal Blood/chemistry, Humans, Infant; Newborn, Male, Middle Aged, Research Support; Non-U.S. Gov't, Serum Amyloid A Protein/*analysis, Sweden
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-92981PubMedID: 16279005OAI: oai:DiVA.org:uu-92981DiVA: diva2:166320
Available from: 2005-04-29 Created: 2005-04-29 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Serum Amyloid A Protein (SAA) in Healthy and Infected Individuals
Open this publication in new window or tab >>Serum Amyloid A Protein (SAA) in Healthy and Infected Individuals
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Serum amyloid A protein (SAA) is an acute phase protein that has recently gained increasing interest as a potential marker for disease and treatment monitoring. We investigated SAA and CRP levels in (a) patients with various common infectious diseases (n=98), (b) patients with pyelonephritis (n=37) versus patients with cystitis (n=32), (c) healthy individuals of varying ages (n=231), (d) very immature newborn infants with or without nosocomial infections (NIs) (n=72) and (e) patients with bacterial infections treated with cefuroxime (n=81).

SAA significantly correlated with CRP in viral as well as in bacterial infections (for the total group: r2=0.757, p<0.0001) and showed a systemic inflammatory response in 90% of the patients with cystitis as compared with 23% for CRP. Equally high efficiencies (0.96 and 0.94 for SAA and CRP, respectively) were observed in discriminating between pyelonephritis and cystitis. SAA and high sensitive (hs) CRP were lower in umbilical cords (p<0.0001) and higher in elderly adults (p<0.0001-0.03) than in the other age groups; higher in immature newborn infants than in term infants; and higher in the NI group than in the non-NI group. Interindividual variabilities of the time course of the biomarkers SAA and CRP were considerable. Because of the smoothed distribution of SAA and CRP (i.e. elevations were both essentially unchanged during the first 3 days of cefuroxime treatment), these markers were not useful when deciding parenteral-oral switch of therapy, which occurred within this time period in most cases.

SAA is a sensitive systemic marker in cystitis. SAA and hsCRP in umbilical cord blood are close to the detection limit and increase with age. They increase in relation to NI in very immature newborn infants and might therefore be used in diagnosis and monitoring. Finally, SAA and CRP in adults with bacterial infections could not predict an early parenteral-oral switch of antimicrobial therapy.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 50 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 32
Keyword
Communicable diseases, acute phase proteins, adult, Administration Oral, aminoglycosides, amyloidosis, antibiotics, bacterial infections, body temperature, C-reactive protein, cefuroxime, cystitis, cytokines, elderly, infant, interleukin-6, newborn, pyelonephritis, serum amyloid A protein, virus diseases, Infektionssjukdomar
National Category
Infectious Medicine
Identifiers
urn:nbn:se:uu:diva-5774 (URN)91-554-6233-2 (ISBN)
Public defence
2005-05-24, Rosénsalen, Akademiska sjukhuset, Ing 95/96, Uppsala, 09:15
Opponent
Supervisors
Available from: 2005-04-29 Created: 2005-04-29Bibliographically approved

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Lannergård, AndersFriman, GöranEwald, UweLind, LarsLarsson, Anders

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