ResMed AutoSet for Her: What Makes the Algorithm and Masks Different?

If you have looked at ResMed CPAP machines or masks, you may have come across the words ‘For Her’. It is easy to assume this simply means a smaller mask, different colour or female-focused marketing. With ResMed, however, there are actually two very different ‘For Her’ concepts. AutoSet for Her is a different CPAP pressure-response algorithm. A For Her mask, on the other hand, is primarily about fit and sizing. Understanding that distinction helps separate the genuine technology from the branding.

Why Was a Different CPAP Algorithm Developed for Women?

Obstructive sleep apnoea does not always present in exactly the same way in men and women. Research suggests that, on average, women with OSA tend to have fewer complete obstructive apnoeas, more hypopnoeas and flow-limited breathing, lower overall AHI values and proportionally more respiratory events during REM sleep. Women may also experience more sleep fragmentation and can remain symptomatic at comparatively lower AHI values. [1] These are population-level differences, not rules. Some women have very typical repetitive obstructive apnoeas, while some men have prominent flow limitation. These observations provided part of the rationale for developing an automatic PAP algorithm that responds somewhat differently to breathing patterns reported more frequently in women.

First: What Does Standard AutoSet Do?

A ResMed AutoSet device continuously analyses the patient's breathing during sleep and automatically varies pressure within a prescribed range. Rather than providing one fixed pressure throughout the night, it responds to signals associated with upper-airway obstruction, including flow limitation, snoring and obstructive apnoeas. Pressure can therefore increase when the airway becomes unstable and decrease again when less pressure is required. The exact details matter because different APAP manufacturers use proprietary algorithms to decide which respiratory signals to respond to and how rapidly pressure should change. Modern reviews emphasise that APAP algorithms are not interchangeable simply because two devices are both labelled ‘automatic CPAP’. [2]

What Does AutoSet for Her Do Differently?

ResMed's AutoSet for Her algorithm is based on the standard AutoSet platform but modifies several parts of the pressure response. One of the most important differences is that it is designed to be more responsive to flow limitation.

Flow limitation is not the same as an apnoea. During an apnoea, airflow stops or is markedly reduced. During flow limitation, the airway is narrowing but has not necessarily collapsed enough to meet the criteria for an apnoea or hypopnoea. The shape of the inspiratory airflow waveform becomes flattened as the patient tries to breathe through the narrowed airway. Because flow-limited breathing and respiratory-effort-related events have been reported more frequently in women with OSA, this became an important target for the For Her algorithm. [1,3]

More Sensitive Does Not Mean More Aggressive

An important feature of AutoSet for Her is that its pressure response is deliberately gentler. ResMed's technical documentation describes reduced pressure-increase rates and slower pressure decay compared with the standard AutoSet response. [4] So while the algorithm is designed to recognise flow limitation sensitively, it does not simply react by increasing pressure more rapidly. The intention is to address developing upper-airway obstruction while reducing unnecessary or abrupt pressure changes that might disturb sleep.

AutoSet for Her is designed to be more sensitive to certain breathing patterns, but gentler in how pressure is delivered.

What Is the Adaptive Minimum Pressure?

Another difference appears when repeated obstructive events occur. In AutoSet for Her mode, repeated apnoeas can cause the algorithm to establish an adaptive minimum pressure. Rather than allowing the pressure to fall immediately back to a lower level after an obstructive cluster, the machine can temporarily maintain a higher pressure floor. ResMed's technical documentation describes this adaptive minimum pressure as being limited to 10 cmH₂O. [4] This behaviour is relevant because some patients — including many women with REM-predominant OSA — may experience respiratory events in clusters rather than evenly throughout the entire night.

Does AutoSet for Her Stop at 12 cmH₂O?

No. This is one of the most misunderstood parts of the algorithm. AutoSet for Her does not have a maximum treatment pressure of 12 cmH₂O. Instead, the 12 cmH₂O threshold relates specifically to the algorithm's response to obstructive apnoeas. ResMed states that the For Her algorithm responds to apnoeas up to 12 cmH₂O but can continue increasing pressure in response to flow limitation and snoring up to the prescribed maximum pressure. [4] So the distinction is not that the machine cannot go above 12; above 12, different respiratory signals drive further pressure increases.

Has AutoSet for Her Been Clinically Studied?

Yes — but the evidence needs to be interpreted carefully. A prospective randomised crossover study compared the AutoSet for Her algorithm with ResMed's standard AutoSet algorithm in 20 premenopausal women with obstructive sleep apnoea who were already established on PAP treatment. [3] Each participant underwent one laboratory night on each algorithm. Both algorithms controlled OSA effectively. The treated AHI and 3% oxygen desaturation index were similar between the two modes. However, participants spent slightly less of the night in flow limitation using AutoSet for Her, and the 95th-centile pressure was lower: approximately 10.6 cmH₂O with AutoSet for Her compared with 11.6 cmH₂O using standard AutoSet. [3]

Those findings support the idea that the algorithms genuinely behave differently, but they do not prove that AutoSet for Her is better for every woman. The study was small, involved only 20 premenopausal women, compared only one night on each algorithm and was sponsored by ResMed. Several authors also had affiliations with the manufacturer. [3] Larger independent long-term studies would be needed to determine whether these differences produce meaningful outcome advantages for particular patient groups.

Does the AirSense 11 AutoSet Include the For Her Algorithm?

Yes. The ResMed AirSense 11 AutoSet includes multiple therapy modes, including standard AutoSet and AutoSet for Her. A patient therefore does not need to purchase an entirely separate ‘women's CPAP machine’ simply to access the For Her algorithm. The appropriate mode can be selected according to the patient's treatment requirements.

Is AutoSet for Her Automatically Better for Every Woman?

No. The fact that certain breathing patterns occur more commonly in women at a population level does not mean that every woman has the same pattern. One patient's diagnostic sleep study might show classic repetitive obstructive apnoeas that respond extremely well to standard AutoSet. Another may have significant flow limitation or REM-predominant obstruction where the For Her response could be worth considering. Likewise, some male patients demonstrate significant flow limitation.

Therapy mode should therefore not be chosen simply from the patient's sex. The more useful questions are: What did the diagnostic sleep study show? What happens to pressure during treatment? Is flow limitation persisting? Are there residual obstructive events? Is leak controlled? How does the patient actually feel? A low treated AHI is important, but it is not the only information available from modern PAP therapy.

What About ResMed ‘For Her’ Masks?

The mask story is completely different. A For Her mask does not contain a special algorithm. It does not change how the CPAP machine detects events, and it does not deliver different pressure simply because the patient is female. The main differences are size range, headgear dimensions and fit options, often combined with different colour accents.

For example, ResMed's product information shows that the AirFit P10 for Her system includes Extra-Small, Small and Medium nasal pillows with For Her headgear, whereas the standard P10 package traditionally includes a larger size range. [5] The AirFit N20 for Her uses the same N20 mask platform and InfinitySeal cushion technology but is supplied in a smaller configuration with For Her headgear. [6] Likewise, AirFit F20 for Her systems use the same F20 family cushion and mask technology but are supplied with smaller headgear and smaller-size configurations. [7] In other words: the mask technology is largely shared; the fit options are different.

Does a Woman Need a For Her Mask?

No. Mask selection should be based on the individual's face — not the label on the packaging. Many women fit standard ResMed masks perfectly. Some women benefit from smaller For Her headgear or an Extra-Small cushion or pillow. There are also men who may require smaller mask components. At CPAP Equip, we prefer to think in terms of correct mask fit, not ‘men's masks’ and ‘women's masks’.

Why Does Mask Size Matter So Much?

Mask fit is not merely cosmetic. A mask that is too large may move excessively, leak around the eyes or mouth, or require the patient to overtighten the headgear in an attempt to maintain a seal. A mask that is too small may cause pressure points, discomfort or instability. Significant mask leak can disrupt sleep and may affect therapy performance and the quality of data available for clinical review. Choosing the correct mask type and size is therefore an important part of effective CPAP therapy.

AutoSet for Her vs a For Her Mask: The Simple Difference

AutoSet for Her changes how the CPAP machine responds to your breathing. A For Her mask changes how the interface fits your face. One is a therapy algorithm. The other is primarily a sizing and fitting option. They solve two completely different problems.

The Bigger Lesson: CPAP Therapy Should Be Individualised

What is valuable about the concept behind AutoSet for Her is not the idea that every woman requires different CPAP treatment. It is the recognition that patients with obstructive sleep apnoea are not all physiologically identical. Two people with a similar AHI may have different proportions of apnoeas, hypopnoeas and flow limitation. Their events may occur at different sleep stages. Their pressure requirements may differ throughout the night. Their masks certainly will not all fit the same way.

At CPAP Equip, therapy is supported using the patient's sleep-study information, appropriate device setup, correct mask selection and ongoing therapy data where available. For ResMed users supported through AirView, information such as usage, pressure, residual AHI and leak can help identify whether therapy continues to perform as intended. The goal is not to use a ‘For Her’ setting because someone is a woman. The goal is to use the right therapy for the breathing pattern in front of us.

Written by Jean-Marie Claassens

Clinical Technologist (Pulmonology)

Owner – CPAP Equip & Breathe Smart Lung Function & Sleep Lab

CPAP Equip

Clinically Supported CPAP Therapy. Nationwide.

Frequently Asked Questions

What is ResMed AutoSet for Her?

AutoSet for Her is a modified version of ResMed's automatic PAP pressure-response algorithm. It is designed to respond more sensitively to flow limitation while using gentler pressure changes.

Is AutoSet for Her just a lower-pressure mode?

No. It is a different algorithm. Research has shown lower 95th-centile pressure in a small study, but its pressure response is determined by the patient's breathing and prescribed pressure range.

Does the AirSense 11 AutoSet have AutoSet for Her?

Yes. AutoSet for Her is available as a therapy mode on the AirSense 11 AutoSet.

Does AutoSet for Her stop at 12 cmH₂O?

No. The 12 cmH₂O threshold relates to the algorithm's response to apnoeas. It can continue increasing pressure above this level in response to flow limitation and snoring within the prescribed therapy range.

Is AutoSet for Her better for all women?

There is not enough evidence to say that. Therapy mode should be selected according to the individual's sleep study, breathing pattern, treatment data, symptoms and clinical response.

Can men use AutoSet for Her?

The algorithm was developed around OSA patterns reported more frequently in women. Individual breathing patterns vary, so therapy-mode selection should be clinically based rather than determined by sex alone.

What is different about ResMed For Her masks?

The main differences are smaller sizing and headgear options. They generally share the core cushion, frame and sealing technology of the corresponding standard mask family.

Does a woman need a For Her mask?

No. The correct mask is the one that fits the individual face properly, remains comfortable and maintains an effective seal.

Research & References

[1] Schwarz EI, Schiza S. Sex differences in sleep and sleep-disordered breathing. Current Opinion in Pulmonary Medicine. 2024;30(6):593–599. doi:10.1097/MCP.0000000000001116.

[2] Auto-adjusting positive airway pressure: the fine line between engineering and medicine. Sleep and Breathing. 2025. PMID: 40719998.

[3] McArdle N, King S, Shepherd K, et al. Study of a Novel APAP Algorithm for the Treatment of Obstructive Sleep Apnea in Women. Sleep. 2015;38(11):1775–1781. doi:10.5665/sleep.5162.

[4] ResMed. AutoSet for Her algorithm / therapy technical documentation. Manufacturer technical documentation. Used specifically for proprietary algorithm behaviour and device specifications.

[5] ResMed. AirFit P10 for Her product information and components guide.

[6] ResMed. AirFit N20 for Her product information and components guide.

[7] ResMed. AirFit F20 for Her product information and components guide.

Clinical Disclaimer

This article provides general educational information about CPAP technology and does not replace an individual sleep-study review, PAP titration or assessment by an appropriately qualified healthcare professional.