Your Expert Eye

The Exclusive Sonicaid® DAWES-REDMAN Algorithm

The unique and exclusive DAWES REDMAN® algorithm, validated against a library of over 100,000 pregnancies, reliably and effectively¹ analyses CTG traces. It enables you to consistently¹ interpret CTGs so you can formulate your clinical assessment early and confidently.

[1] Jones, Gabriel Davis, et al. “Computerized analysis of antepartum cardiotocography: a review.” Maternal-Fetal Medicine 4.2 (2022): 130-140.

Unique

A substantial number of peer-reviewed publications¹ have specifically featured the DAWES REDMAN algorithm as implemented in Huntleigh monitors, making this evidenced-based analysis unique.

Objective

It objectively, automatically and in a numerical way analyses Fetal Heart Rates patterns against standardised criteria which define a normal CTG recordings.

Comprehensive

It delivers a complete analysis of all aspects of the CTG trace according to defined normality criteria therefore  providing a more holistic view of fetal health.

Evidence-based

Designed and validated from Oxford University database of well over 100,000 CTG traces, it provides an aid to interpretations that are significantly more reliable than human assessments²

[1] Oxford DAWES REDMAN resources page and bibliography : Resources — Dawes-Redman.

[2] Jones, Gabriel Davis, et al. “Computerized analysis of antepartum cardiotocography: a review.” Maternal-Fetal Medicine 4.2 (2022): 130-140.

Huntleigh Healthcare are the exclusive manufacturer allowed to commercialise (under Oxford University licencing) the original DAWES REDMAN® algorithm developed by professors Geoffrey Dawes and Chris Redman, at the University of Oxford.

The Sonicaid® Team3 fetal monitors and Sonicaid Centrale 3 CTG viewing and archiving system are the only globally distributed medical devices which enable you to run a printed and digital recording using the authentic and latest DAWES REDMAN® software.

Products manufactured by other companies will not have been validated against the University of Oxford’s unique database (where the system was and continues to be developed) and therefore might not perform in the same way. In many instances these other forms of computerised CTG analysis may not have the same depth of peer-reviewed publications as the DAWES REDMAN algorithm implemented in Huntleigh’s monitors.

Consistent and reliable¹

The DAWES-REDMAN CTG ANALYSIS® insures consistent and objective, quantifiable interpretation of CTG patterns, reducing the variability that can occur with subjective visual assessments.

“The DAWES-REDMAN CTG ANALYSIS® has enabled the effective assessment of antepartum CTGs in a consistent and reliable format that significantly outperforms humans.“¹

Effective³

“The DAWES REDMAN® algorithm is effective for its intended purpose: identifying a state of fetal wellbeing. This is evidenced by its high specificity.”³

Saves Time

The analysis can be concluded in as little as 10 minutes². It helps increase efficiency, focusing time on higher risk mums. One analysis estimated 1600h of midwifery time saved across 2869 analysed traces.⁴

Saves Cost

Saving time can also save costs, as the number of mothers and babies number being monitored increases. Furthermore, helping prevent one poor outcome could save millions of pounds in litigation. Over the past 11 years, the NHS has paid out £3.6bn for 1,307 cases involving babies who suffered brain damage.⁵

Help Avoid Poor Outcomes

The DAWES REDMAN® interpretation tool provides another decision aid designed to help assess the health of mothers and babies thus avoiding poor outcomes. A recent study brought to light the significance of meeting criteria. It evaluated that “The risk of adverse perinatal outcome is 8 to 9 times higher in the group not meeting (DAWES REDMAN®) criteria than when the criteria are met..”⁶

[1] Jones, Gabriel Davis, et al. “Computerized analysis of antepartum cardiotocography: a review.” Maternal-Fetal Medicine 4.2 (2022): 130-140.

[2] Pardey J, Moulden M, Redman CW. A computer system for the numerical analysis of nonstress tests. Am J Obstet Gynecol. 2002 May;186(5):1095-103

[3] Davis Jones G, Albert B, Cooke W, Vatish M. Performance evaluation of computerized antepartum fetal heart rate monitoring: Dawes-Redman algorithm at term. Ultrasound Obstet Gynecol. 2025 Feb;65(2):191-197.

[4] Dawes et al. Antenatal CTG quality and interpretation using computers.  BJOG 1992;99:791-797

[5] Denis Campbell. Brain damage to babies in birth has cost NHS in England £4.1bn in lawsuits. The Guardian. 26 May 2024

The DAWES REDMAN® algorithm is a well-documented and widely adopted computerised CTG analysis systems. it’s extensive validation an thorough clinical documentation over the years further underscore the integrity of Huntleigh Healthcare technology.

Here is a list of the most recent publications:

• Performance evaluation of computerized antepartum fetal heart rate monitoring: Dawes-Redman algorithm at term
• The significance of meeting Dawes-Redman criteria in computerised antenatal fetal heart rate assessment
• Computerized Analysis of Antepartum Cardiotocography: A Review
• CTG Guidelines from the German, Austrian and Swiss gynaecology and obstetrics groups published in October 2024
• Antenatal cardiotocogram quality and interpretation using computers
• A computer system for the numerical analysis of nonstress tests
  
  For additional clinical publications and resources, visit the Oxford DAWES REDMAN® website.