I have a CBC test and peripheral smear test today. I had sex at 3 AM today, and my blood test is scheduled in 4 to 5 hours. Should I postpone it until tomorrow, or will it not affect my results? Please help.

Answered by 1 Apollo Doctors

Dr Yusuf Mohammad

General Practitioner

MBBS
Advanced Certificate Course in Dermatology
8+ Yrs

Consult Now

Sex before a blood test (CBC or peripheral smear) does not affect the results. These tests measure blood cells, hemoglobin, and general health, not influenced by sexual activity. No need to postpone you can go ahead with the test as planned. Just ensure youre well hydrated and not physically exhausted.

Dr. Yusuf Suggests...

Take a COMPLETE BLOOD COUNT (CBC) Test or Take a PERIPHERAL SMEAR Test

Book COMPLETE BLOOD COUNT (CBC) Test Book PERIPHERAL SMEAR Test

Answered 10/09/2025

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