2 doctors weighed in:

How much blood can you lose before unconsciousness occurs?

2 doctors weighed in
Dr. Nilofer Nisar
Neurology
1 doctor agrees

In brief: Greater than 2 liter

Also depends how quick is the blood loss.
With slow blood loss body system can compensate for that so a person may not have any symptom even if hemoglobin is 8 or 9.

In brief: Greater than 2 liter

Also depends how quick is the blood loss.
With slow blood loss body system can compensate for that so a person may not have any symptom even if hemoglobin is 8 or 9.
Dr. Nilofer Nisar
Dr. Nilofer Nisar
Thank
Get help from a real doctor now
Dr. Bennett Machanic
Board Certified, Neurology
48 years in practice
55M people helped
Continue
108,000 doctors available
Read more answers from doctors