We have chosen to report sensitivity, specificity, PPV and NPV of both BMI and BP, although we recognise that since data collection was completed, guidance has changed such that BP readings as measured by our researchers are no longer the ‘gold standard’ for diagnosing hypertension. Self-reported and researcher-measured BPs were classified as either UKMEC 1 and 2 or UKMEC 3 and 4. The mean of the BP readings was used as the researcher-measured reading. To compare self-reported with researcher-measured values, we report Kappa coefficients, as well as sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV), of BP and BMI. 8 We aimed to compare self-reported BMI and BP measurements with measurements taken by researchers. We studied a UK-based, online contraceptive service, SH:24, which provided COC via post after an online medical history and self-reported height, weight and BP. A body mass index (BMI) equal to or greater than 35 kg/m 2 or a BP consistently above 140/90 mm Hg would be classified as UKMEC 3 or 4. 6 7 A classification of 1 or 2 implies that benefits of COC use outweigh the risks, while a classification of 3 or 4 suggests that risks of use outweigh benefits. The UK and WHO medical eligibility criteria (UKMEC/WHOMEC) classify all contraceptive contraindications on a scale of 1–4. The accuracy of these biometric measurements is important to ensure appropriate, safe prescription. 5 Remote prescription of the combined oral contraceptive (COC) requires a medical history and self-reported height, weight and blood pressure (BP). Online services might facilitate access to contraception, enabling users to order oral contraception with remote prescribing and postal delivery. Online services increase access to testing, including among those who have never tested before.

Online sexual health services, offering tests for sexually transmitted infections ordered online and posted home, with self-taken samples posted to laboratories and results communicated remotely, have become part of the UK sexual health economy.

1 While contraception is available free of cost in the UK, research has found that 37.0% of women have difficulty accessing contraceptive services. In the United Kingdom (UK), 29.5% of sexually active women of reproductive age use oral contraceptives.

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