Get Virtual Care
For Businesses
About Us
A member asked:
What causes blood to be dark, almost black when drawn for lab tests?
A doctor has provided 1 answer
Deoxygenation: Blood is never black..it just looks deep red from venous circulation. When blood becomes oxygenated...it gets bright bright red...when deoxygenated....dark red/maroon.
Answered 3/8/2019
3.1k views
Thank
Related Questions
A member asked:
Yesterday, my blood is taken for lab test. The physician told my blood quite thick? Is it caused by taking Epilim for long time?
6 doctors weighed in across 2 answers
A member asked:
Can HIV RNA test detect dead virus? Reason for asking, if nurse made a mistake taking blood or transferring it to lab
A doctor has provided 1 answer
People also searched for:
What causes blood in a blood draw to appear black? When I had my labs drawn my blood was black. The lab tech even commented on the color, stated "she had never seen blood that dark before."
Is possible to have both vitamin d tests drawn in one blood lab?
Hi dr How accurate is hiv finger prick test vs blood drawn from lab test at 3.5 month i have taken rapid finger prick test at 3.5 months? is it reliable ?
How reliable is alere determine ab/ag 4th gen rapid test with fingerprick at 80/81 days? I was negative on above fingerprick test and also negative on lab test with blood drawn from vein although I don't know whether was 3rd or 4th gen?
Could I have hiv if I tested negative at 3 months and 6 months after intercourse that was unprotected? I know huge mistake havent had any others since then the dr told me it was known as a combo test I had to have blood drawn and sent to lab?
Didn't find what you're looking for?
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your questionMore of what we treat
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.
HIPAASecure
SOC 2 Type 2Certified
JCAHOAccredited
Download HealthTap
Video visit and message your doctor
