1. Accuracy of a home-based device for giving an early estimate of pregnancy duration compared with reference methods 
Sarah R. Johnson, Ph.D., Sonya Godbert, M.Sc., Paul Perry, B.Sc., Pauline Parsons, B.Sc., Louise Roberts, B.Sc., Philip Buchanan, Ph.D., John Larsen, M.D., Todd A. Alonzo, Ph.D., Michael Zinaman, M.D. 
Fertility and Sterility 
Volume 100, Issue 6, Pages e1 (December 2013)
DOI: /j.fertnstert
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Inside a Clearblue Advanced Pregnancy Test with Weeks Estimator device and examples of the results windows. The device contains two hCG assay strips, one low sensitivity (with an hCG detection threshold that enables discrimination between pregnancy duration of 2–3 and 3+ weeks) and one high sensitivity (with two hCG detection thresholds, the first to distinguish between Not Pregnant and Pregnant results and the second to discriminate between 1–2 and 2–3 weeks). Note the weeks' results relate to time since ovulation, rather than GA (that is, time since LMP).
Fertility and Sterility  , e1DOI: ( /j.fertnstert )
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

3. Fertility and Sterility 2013 100, 1635-1641. e1DOI: (10. 1016/j
Fertility and Sterility  , e1DOI: ( /j.fertnstert )
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions