The level of hypoxemia that the child may have experienced during the submersion depends on several factors, but the most important ones are:

• The **temperature of water**: Cold water can induce a diving reflex, which lowers the heart rate and oxygen consumption, and may protect the brain from hypoxic injury. Cold water can also cause laryngospasm, which prevents water aspiration but also impairs gas exchange.
• The **amount of time the child was submerged**: The longer the submersion, the more severe the hypoxemia and the higher the risk of brain damage and death. The survival rate decreases significantly after 5 minutes of submersion.

The other factors are less relevant or not directly related to the level of hypoxemia:

• The **weight of the child**: This may affect the buoyancy and the ability to float or swim, but not the oxygen consumption or gas exchange during submersion.
• The **oxygen concentration of the ambient air**: This may affect the pre-submersion oxygen saturation, but not the rate of oxygen depletion or gas exchange during submersion.
• The **witnessing of the fall into the pool**: This may affect the time to rescue and resuscitation, but not the level of hypoxemia during submersion.

The correct answer and explanation is:

a) Health care proxy documentation.

This is the information that the PN should collect during the admission assessment of a terminally ill client to an acute care facility. Health care proxy documentation is a legal document that appoints a person to make health care decisions for the client when they are unable to do so themselves. It is important to have this information in case the client's condition deteriorates and they need end-of-life care.

b) Name of funeral home to contact.

This is not the information that the PN should collect during the admission assessment of a terminally ill client to an acute care facility. Name of funeral home to contact is a personal preference that may or may not be relevant for the client at this point. It is not a priority for the admission assessment, and it may be insensitive or inappropriate to ask the client about it.

c) Client's wishes regarding organ donation.

This is not the information that the PN should collect during the admission assessment of a terminally ill client to an acute care facility. Client's wishes regarding organ donation are a personal choice that may or may not be applicable for the client depending on their diagnosis, prognosis, and eligibility. It is not a priority for the admission assessment, and it may be offensive or upsetting to ask the client about it.

d) Contact information for the client's next of kin.

This is not the information that the PN should collect during the admission assessment of a terminally ill client to an acute care facility. Contact information for the client's next of kin is a general demographic data that may or may not be relevant for the client's care. It is not a priority for the admission assessment, and it may be already available in the client's records.