Blood oxygen levels during sleep should be at a 95 percent saturation, which is considered normal, according to the American Sleep Apnea Association (AASM).
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It is normal for blood oxygen levels to decrease during sleep. All body systems have altered basal function during your sleep, including breathing. You don’t breathe as deeply when you are sleeping, and not all your lung spaces function at full capacity. Because of this effect of sleep on breathing, it is normal for your sleep oxygen level to decrease below awake levels. Tests that show a waking oxygen level at or above 94 percent typically indicate a sleep oxygen level of at or above 88 percent.
However, when it persistently drops below maintenance levels, health problems can develop. In addition, certain medical conditions can lead to low oxygen while you are asleep.
- Oxygen status is commonly monitored noninvasively by peripheral saturation monitoring (SpO 2). However, the risk of hyperoxia above specific SpO 2 levels in critically ill patients is unknown. The purpose of this study was to determine a threshold value of SpO 2 above which the prevalence of arterial hyperoxia distinctly increases.
- Your “Normal” SpO 2 Range According to the Mayo Clinic, normal pulse oximeter readings usually range from 95 to 100 percent. Values under 90 percent are considered low, and indicate the need for supplemental oxygen.
Medical Disorders
According to the Mayo Clinic, certain medical problems, especially of the cardiovascular and respiratory systems, can lead to blood oxygen below normal levels. The effects of these conditions can worsen while you are sleeping. The most common disorders include:
Diseases of the lungs:
Several lung diseases can narrow or block lung air spaces, inflame or scar lung tissue, and can also interfere with normal breathing patterns. These lung diseases include:
- Chronic obstructive pulmonary disease (COPD), such as emphysema and chronic bronchitis
- Asthma
- Cystic fibrosis, a genetic disease that causes a build of mucus in the lungs
- Pneumonia and other lung infections
- Smoking and lung cancer
Heart diseases:
Disorders of the heart, which can interfere with blood flow, blood oxygen level, and oxygen supply to tissues include:
- Coronary heart disease, a build-up of plaques in the arteries of the heart
- Congestive heart failure with leakage of fluid into lung tissue
- Congenital heart disease, a developmental defect in the structure of the heart
Anemia:
The decrease in hemoglobin (Hgb) with anemia lowers the ability of your red blood cells to absorb oxygen from your lungs and carry it to your tissues. Abnormal Hgb, such as with sickle cell anemia, causes the same problem.
Obesity:
This a cause of sleep apnea where the throat becomes obstructed during sleep and interferes with breathing. Obesity also causes obesity hypoventilation syndrome (OHS), with diminished deep breathing and oxygen intake.
Drugs:
Chronic use of prescription or illegal opioids, sedatives, and recreational or other illegal drugs can depress the brain’s breathing center and therefore slow down your breathing and oxygen intake.
Alcohol:
Abuse of alcohol, especially at bedtime and mixed with drugs, can interfere with normal breathing and sufficient oxygen intake.
Health Consequences
A normal blood oxygen level is vital for normal tissue and cellular function. Therefore, low blood oxygen affects the function of every tissue in the body. A chronic problem of low oxygen levels while sleeping can increase the risk for several health consequences including:
Spo2 Chart By Age
- Sleep disorders, such as bouts of insomnia
- Poor sleep quality, such as restless sleep with several awakenings
- High blood pressure
- Cardiovascular disease including heart failure
- Cardiac arrhythmia and a risk for sudden death
- Type 2 diabetes
- Depressed brain function and possible brain damage
- Risk for loss of consciousness, coma, and death
If you think your oxygen level falls below normal while you are sleeping, consult with your doctor. He might suggest a sleep study as part of your evaluation. During an overnight stay in a sleep center, a technician monitors your breathing and other signs, as well as your blood O2 sat with a pulse oximeter during sleep.
-->APPLIES TO: 2013 2016 2019 SharePoint in Microsoft 365
Default permission levels are predefined sets of permissions that you can assign to individual users, groups of users, or security groups, based on the functional requirements of the users and on security considerations. SharePoint Server permission levels are defined at the site collection level and are inherited from the parent object by default.
Default permission levels
Default permission levels are made up of a set of permissions that enable users to perform a collection of related tasks. SharePoint Server includes seven permission levels. You can customize the permissions contained within five of these permission levels. You cannot customize the permissions within the Limited Access and Full Control permission levels.
Note
Although you cannot directly edit the Limited Access and Full Control permission levels, you can make individual permissions unavailable for the entire web application, which removes those permissions from the Limited Access and Full Control permission levels. For more information, see Manage permissions for a web application in SharePoint Server.
The following table lists the default permission levels for team sites in SharePoint Server.
| Permission level | Description | Permissions included by default |
|---|---|---|
| View Only | Enables users to view application pages. The View Only permission level is used for the Excel Services Viewers group. | View Application Pages View Items View Versions Create Alerts Use Self Service Site Creation View Pages Browse User Information Use Remote Interfaces Use Client Integration Features Open |
| Limited Access | Enables users to access shared resources and a specific asset. Limited Access is designed to be combined with fine-grained permissions to enable users to access a specific list, document library, folder, list item, or document, without enabling them to access the whole site. Limited Access cannot be edited or deleted. | View Application Pages Browse User Information Use Remote Interfaces Use Client Integration Features Open |
| Read | Enables users to view pages and list items, and to download documents. | Limited Access permissions, plus: View Items Open Items View Versions Create Alerts Use Self-Service Site Creation View Pages |
| Contribute | Enables users to manage personal views, edit items and user information, delete versions in existing lists and document libraries, and add, remove, and update personal Web Parts. | Read permissions, plus: Add Items Edit Items Delete Items Delete Versions Browse Directories Edit Personal User Information Manage Personal Views Add/Remove Personal Web Parts Update Personal Web Parts |
| Edit | Enables users to manage lists. | Contribute permissions, plus: Manage Lists |
| Design | Enables users to view, add, update, delete, approve, and customize items or pages in the website. | Edit permissions, plus: Add and Customize Pages Apply Themes and Borders Apply Style Sheets Override List Behaviors Approve Items |
| Full Control | Enables users to have full control of the website. | All permissions |
If you use a site template other than the team site template, you will see a different list of default SharePoint permission levels. For example, the following table shows additional permission levels provided with the publishing template.
| Permission level | Description | Permissions included by default |
|---|---|---|
| Restricted Read | View pages and documents. For publishing sites only. | View Items Open Items View Pages Open |
| Approve | Edit and approve pages, list items, and documents. For publishing sites only. | Contribute permissions, plus: Override List Behaviors Approve Items |
| Manage Hierarchy | Create sites; edit pages, list items, and documents, and change site permissions. For Publishing sites only. | Design permissions minus the Approve Items, Apply Themes and Borders, and Apply Style Sheets permissions, plus: Manage permissions View Web Analytics Data Create Subsites Manage Alerts Enumerate Permissions Manage Web Site |
User permissions
SharePoint Server includes 33 permissions, which are used in the default permission levels. You can configure which permissions are included in a particular permission level (except for the Limited Access and Full Control permission levels), or you can create a new permission level to contain specific permissions.
Permissions are categorized as list permissions, site permissions, and personal permissions, depending on the objects to which they can be applied. For example, site permissions apply to a particular site, list permissions apply only to lists and libraries, and personal permissions apply only to certain objects, such as personal views and private Web Parts. The following tables describe what each permission is used for, the dependent permissions, and the permission levels in which it is included.
List permissions
| Permission | Description | Dependent permissions | Included in these permission levels by default |
|---|---|---|---|
| Manage Lists | Create and delete lists, add or remove columns in a list, and add or remove public views of a list. | View Items, View Pages, Open | Edit, Design, Full Control, Manage Hierarchy |
| Override List Behaviors | Discard or check in a document that is checked out to another user, and change or override settings that allow users to read/edit only their own items. | View Items, View Pages, Open | Design, Full Control |
| Add Items | Add items to lists, and add documents to document libraries. | View Items, View Pages, Open | Contribute, Edit, Design, Full Control |
| Edit Items | Edit items in lists, edit documents in document libraries, and customize Web Part pages in document libraries. | View Items, View Pages, Open | Contribute, Edit, Design, Full Control |
| Delete Items | Delete items from a list, and documents from a document library. | View Items, View Pages, Open | Contribute, Edit, Design, Full Control |
| View Items | View items in lists, and documents in document libraries. | View Pages, Open | Read, Contribute, Edit, Design, Full Control |
| Approve Items | Approve a minor version of list items or document. | Edit Items, View Items, View Pages, Open | Design, Full Control |
| Open Items | View the source of documents with server-side file handlers. | View Items, View Pages, Open | Read, Contribute, Edit, Design, Full Control |
| View Versions | View past versions of a list item or document. | View Items, Open Items, View Pages, Open | Read, Contribute, Edit, Design, Full Control |
| Delete Versions | Delete past versions of list items or documents. | View Items, View Versions, View Pages, Open | Contribute, Edit, Design, Full Control |
| Create Alerts | Create alerts. | View Items, View Pages, Open | Read, Contribute, Edit, Design, Full Control |
| View Application Pages | View forms, views, and application pages. Enumerate lists. | Open | All |
Site permissions
| Permission | Description | Dependent permissions | Included in these permission levels by default |
|---|---|---|---|
| Manage Permissions | Create and change permission levels on the web site and assign permissions to users and groups. | View Items, Open Items, View Versions, Browse Directories, View Pages, Enumerate Permissions, Browse User Information, Open | Full Control |
| View Web Analytics Data | View reports on Web site usage. | View Pages, Open | Full Control |
| Create Subsites | Create subsites such as team sites, Meeting Workspace sites, and Document Workspace sites. | View Pages, Browse User Information, Open | Full Control |
| Manage Web Site | Grants the ability to perform all administration tasks for the web site, as well as manage content. | View Items, Add and Customize Pages, Browse Directories, View Pages, Enumerate Permissions, Browse User Information, Open | Full Control |
| Add and Customize Pages | Add, change, or delete HTML pages or Web Part pages, and edit the website. | View Items, Browse Directories, View Pages, Open | Design, Full Control |
| Apply Themes and Borders | Apply a theme or borders to the whole website. | View Pages, Open | Design, Full Control |
| Apply Style Sheets | Apply a style sheet (.css file) to the website. | View Pages, Open | Design, Full Control |
| Create Groups | Create a group of users that can be used anywhere within the site collection. | View Pages, Browse User Information, Open | Full Control |
| Browse Directories | Enumerate files and folders in a website by using SharePoint Designer 2013 and Web DAV interfaces. | View Pages, Open | Contribute, Edit, Design, Full Control |
| Use Self-Service Site Creation | Create a website using Self-Service Site Creation. | View Pages, Browse User Information, Open | Read, Contribute, Edit, Design, Full Control |
| View Pages | View pages in a website. | Open | Read, Contribute, Edit, Design, Full Control |
| Enumerate Permissions | Enumerate permissions on the website, list, folder, document, or list item. | Browse Directories, View Pages, Browse User Information, Open | Full Control |
| Browse User Information | View information about users of the website. | Open | All |
| Manage Alerts | Manage alerts for all users of the website. | View Items, View Pages, Open, Create Alerts | Full Control |
| Use Remote Interfaces | Use SOAP, Web DAV, the Client Object Model, or SharePoint Designer 2013 interfaces to access the website. | Open | All |
| Use Client Integration Features | Use features that launch client applications. Without this permission, users must work on documents locally and then upload their changes. | Use Remote Interfaces, Open, View Items | All |
| Open | Enables users to open a website, list, or folder to access items inside that container. | None | All |
| Edit Personal User Information | Enables users to change their own user information, such as adding a picture. | Browse User Information, Open | Contribute, Edit, Design, Full Control |
Spo Level Covid
Personal permissions
| Permission | Description | Dependent permissions | Included in these permission levels by default |
|---|---|---|---|
| Manage Personal Views | Create, change, and delete personal views of lists. | View Items, View Pages, Open | Contribute, Edit, Design, Full Control |
| Add/Remove Personal Web Parts | Add or remove personal Web Parts on a Web Part page. | View Items, View Pages, Open, Update Personal Web Parts | Contribute, Edit, Design, Full Control |
| Update Personal Web Parts | Update Web Parts to display personalized information. | View Items, View Pages, Open | Contribute, Edit, Design, Full Control |
See also
Spo Levels
Other Resources