Post-EVA Lunar Photosynthesis Deficit
Earth designation: Post-EVA Vitamin D Deficiency
Post-EVA presentation of Vitamin D Deficiency in lunar residents. Deficiency of vitamin D from absence of UV light exposure in lunar habitats. Humans synthesize most of their vitamin D through UVB irradiation of skin; lunar habitats do not provide this, and without supplementation, deficiency is virtually universal in lunar residents. Vitamin D is critical for bon...
Lunar Risk Factors
Universal in unsupplemented residents. Habitats with no UV-transparent windows. Darker skin (higher melanin, lower UVB efficiency). Higher latitude habitats with less reflected sunlight.
Symptoms
Bone pain, fatigue, muscle weakness, depression, frequent infections, deficiency-exacerbated osteoporosis.
Diagnosis
Serum 25-hydroxyvitamin D. Target: >75 nmol/L. Quarterly monitoring.
Treatment
Vitamin D3 supplementation 2000-4000 IU daily. Higher doses for severe deficiency.
Lunar Medical Bay Protocol
Universal vitamin D3 supplementation: 2000-4000 IU daily for maintenance. Severe deficiency (<25 nmol/L): loading dose protocol (50,000 IU weekly for 6 weeks, then maintenance). Calcium supplementation concurrent. Monitor magnesium (required for vitamin D activation). UV light therapy lamps in habitat common areas (safe spectrum, scheduled exposure).
Evacuation Criteria
Rarely requires evacuation. Vitamin D-related hypercalcemia in excess supplementation.
Prevention
Universal supplementation protocol from day 1. Quarterly monitoring. UV lamp access in all habitats.