Thirty-minute compared to standardised office blood pressure measurement in general practice

Nynke Scherpbier-de Haan*, Mark Van Der Wel, Gijs Schoenmakers, Steve Boudewijns, Petronella Peer, Chris Van Weel, Theo Thien, Carel Bakx

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)


Background: Although blood pressure measurement is one of themost frequently performed measurements in clinical practice, there are concerns about its reliability. Serial, automated oscillometric blood pressure measurement has the potential to reduce measurement bias and 'white-coat effect'. Aim: To study agreement of 30-minute office blood pressure measurement (OBPM) with standardised OBPM, and to compare repeatability. Design and setting: Method comparison study in two general practices in the Netherlands. Method: Thirty-minute and standardised OBPM was carried out with the same, validated device in 83 adult patients, and the procedure was repeated after 2 weeks. During 30-minute OBPM, blood pressure was measured automatically every 3minutes, with the patient in a sitting position, alone in a quiet room. Agreement between 30-minute and standardised OBPM was assessed by Bland-Altman analysis. Repeatability of the blood pressure measurement methods after 2 weeks was expressed as the mean difference in combination with the standard deviation of difference (SDD). Results: Mean 30-minute OBPM readings were 7.6/2.5 mmHg (95% confidence interval [CI] = 6.1 to 9.1/1.5 to 3.4 mmHg) lower than standardised OBPM readings. The mean difference and SDD between repeated 30-minute OBPMs (mean difference = 3/1 mmHg, 95%CI = 1 to 5/0 to 2 mmHg; SDD 9.5/5.3 mmHg) were lower than those of standardised OBPMs (mean difference = 6/2 mmHg, 95%CI = 4 to 8/1 to 4 mmHg; SDD 10.9/6.3 mmHg). Conclusion: Thirty-minute OBPM resulted in lower readings than standardised OBPM and had a better repeatability. These results suggest that 30-minute OBPM better reflects the patient's true blood pressure than standardised OBPM does.

Original languageEnglish
Pages (from-to)e590-e597
JournalBritish Journal of General Practice
Issue number590
Publication statusPublished - 2011
Externally publishedYes


  • Blood pressure
  • General practice
  • Reproducibility of results


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