# Timing of blood tests may cause missed anemia diagnoses

Researchers found that the body's circadian rhythm affects blood hemoglobin levels, meaning the time of day a blood sample is taken could influence whether anemia is detected. This variability may cause some cases to be missed or misdiagnosed. The findings highlight the need for time-aware diagnostic thresholds in routine blood testing.

**Importance:** 3/5

## Sources

### Science
- [New Scientist](https://www.newscientist.com/article/2584965-our-bloods-body-clock-may-be-causing-anaemia-cases-to-be-missed/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS) — Mon, 17 Aug 2026 12:58:26 +0000