FreeStyle Libre flash glucose monitoring system in pregnant woman with type 1 diabetes: a focus on accuracy

  • Milo Gatti
  • Anna Maria Letizia Amato
  • Daniela BruttomessoEmail author
Letter to the Editor

Dear Editor,

The accuracy of FreeStyle Libre in pregnant women with T1DM is not well known. Here, we present our experience in a pregnant patient with type 1 diabetes (T1DM) [1] followed from the second trimester (13 + 5 weeks) to delivery (38 + 1 weeks), when she gave birth to a vital female child weighing 3410 g. 12 sensors belonging to six different lots were used. HbA1c was 6.2%, 5.8%, 4.3% and 4.8%, respectively, before the pregnancy, at 7-, 26- and 35-week gestation. Mean weekly insulin administration is reported in Fig. 1a. Accuracy was assessed by Consensus Error Grid (ConEG) analysis. Pearson correlation coefficient between capillary and interstitial glucose values was computed. Furthermore, the mean absolute relative difference \(\left( {{\text{MARD}}\,={{\left| {{\text{capillary glucose}} - {\text{interstitial glucose}}} \right|} \mathord{\left/ {\vphantom {{\left| {{\text{capillary glucose}} - {\text{interstitial glucose}}} \right|} {{\text{capillary glucose}}}}} \right....



None to declare.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest. Case report was performed as part of routine work and fully independently of the FreeStyle Libre manufacturer.

Ethical approval

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008.

Informed consent

Informed consent was obtained from the patient for being included in the study.

Supplementary material

592_2019_1325_MOESM1_ESM.xlsx (34 kb)
Supplementary material 1 (XLSX 33 KB)


  1. 1.
    Gatti M (2018) Feasibility of FreeStyle Libre flash glucose monitoring system in pregnant woman affected by type 1 diabetes. Acta Diabetol. Google Scholar
  2. 2.
    Scott EM, Bilous RW, Kautzky-Willer A, Accuracy (2018) User acceptability, and safety evaluation for the FreeStyle Libre flash glucose monitoring system when used by pregnant women with diabetes. Diabetes Technol Ther 20(3):180–188CrossRefGoogle Scholar
  3. 3.
    Fokkert MJ, van Dijk PR, Edens MA et al (2017) Performance of the FreeStyle Libre flash glucose monitoring system in patients with type 1 and 2 diabetes mellitus. BMJ Open Diabetes Res Care 5:e000320CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Italia S.r.l., part of Springer Nature 2019

Authors and Affiliations

  • Milo Gatti
    • 1
  • Anna Maria Letizia Amato
    • 2
  • Daniela Bruttomesso
    • 2
    Email author
  1. 1.Postgraduate School of Clinical Pharmacology and ToxicologyUniversity of MilanMilanItaly
  2. 2.Division of Metabolic Diseases, Department of MedicineUniversity of PadovaPaduaItaly

Personalised recommendations