Office of the Chief Health and Medical Officer (OCHMO)

Office of the Chief Health and Medical Officer (OCHMO)
Astronauts
General
Humans in Space
International Space Station (ISS)
NASA’s Office of the Chief Health and Medical Officer formed a working group in August 2026 to review the most recent data related to extravehicular activity (EVA) prebreathe testing and decompression sickness (DCS) events, venous thromboembolism (VTE) in-flight occurrences, and patent foramen ovale (PFO) implication as they relate to NASA’s Artemi
Posted September 22, 2026
General
Artemis
Astronauts
Exploration Systems Development Mission Directorate
Human Spaceflight Mission Directorate
Humans in Space
International Space Station (ISS)
Johnson Space Center
Knowledge Inventory For Professionals
Mars
Moon Base
Office of the Chief Health and Medical Officer (OCHMO)
Planning crewed missions to the Moon and Mars involves preparing for the medical realities of long-duration space travel. Factors like cosmic radiation, microgravity, and distance from Earth create unique health considerations for astronauts. To anticipate these needs ahead of time, NASA developed the Integrated Medical Model (IMM).
Posted September 16, 2026
Office of the Chief Health and Medical Officer (OCHMO)
General
Human Health and Performance
Human System Risks
Humans in Space
The Human Body in Space
In April 2026, NASA’s Office of the Chief Health and Medical Officer (OCHMO) initiated a working group to review updated VTE case information, additional data gathered revealing altered blood flow status within a cohort of astronauts, and discuss progress of research and clinical activities intended to mitigate the risk of VTE during spaceflight wi
Posted July 18, 2026
Office of the Chief Health and Medical Officer (OCHMO)
Astronauts
General
Human Health and Performance
Humans in Space
The Human Body in Space
In October 2024, NASA’s Office of the Chief Health and Medical Officer (OCHMO) initiated a working group to review the status and progress of research and clinical activities intended to mitigate the risk of venous thromboembolism (VTE) during spaceflight.
Posted March 15, 2025
Office of the Chief Health and Medical Officer (OCHMO)
Human Health and Performance
Humans in Space
The Human Body in Space
NASA’s Office of the Chief Health and Medical Officer (OCHMO) assembled a small working group to review hydrogen sulfide (H2S) Spacecraft Maximum Allowable Concentration (SMAC) values. The group met virtually three times during February and March 2023, and panel members submitted individual opinion statements in April 2023.
Posted January 17, 2025
Office of the Chief Health and Medical Officer (OCHMO)
Human Health and Performance
Humans in Space
International Space Station (ISS)
In June 2024, the NASA Office of the Chief Health and Medical Officer (OCHMO) Standards Team hosted an independent assessment working group to review the status and progress of research and clinical activities intended to mitigate the risk of decompression sickness (DCS) related to patent foramen ovale (PFO) during spaceflight and associated ground
Posted December 31, 2024
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