Normal blood color depends on the type of blood and its context. For menstrual blood, a range of colors is considered normal. For other types of blood, such as that observed in a wound or during a medical test, the color provides vital clues about its state and oxygen levels.
Menstrual Blood Color
The color of menstrual blood can vary from bright red to dark brown or even black, all of which can be considered normal. This variation depends on several factors:
- How recently the blood left the body: Fresh blood is bright red, while blood that has been in the uterus or vagina for a longer time will appear darker. Source: Verywell Health
- Flow rate: A faster flow tends to result in brighter red blood, while a slower flow can lead to darker colors. Source: Verywell Health
- Stage of menstruation: The color may change during your period. Source: Livi
- Pregnancy: Early pregnancy can be associated with darker red or brown blood. Source: Verywell Health
Here is a table summarizing normal menstrual blood colors from Verywell Health:
| Color | Reasons | Normal? |
|---|---|---|
| Bright Red | Fresh blood, Fast flow | Yes |
| Dark Red | Older blood, Slow flow, Early pregnancy | Yes |
| Brown | Older blood, Slow flow, Postpartum, Early pregnancy | Yes |
| Black | Older blood, Slow flow, Vaginal blockage | No |
Important Note: While these colors are typically considered normal, unusual colors (such as orange or grey) or any other concerning symptoms should be addressed by a medical professional. Source: Medical News Today
Other Blood Types
The normal color of blood outside of menstruation is bright red when oxygenated and dark red (or even purplish) when deoxygenated.
- Oxygenated blood: The bright red color is due to the hemoglobin carrying oxygen. Source: Cleveland Clinic
- Deoxygenated blood: The darker color occurs when the hemoglobin has released oxygen.
