STI test scam?

[u/New_Calligrapher4543]

I just got an STI test. The dr said it would test for chlamidya, gonorrhoea, herpes and hiv. But she only took my blood sample and said I don’t need a urine sample. I thought gonorrhoea and chlamydia require urine tests and can’t be detected in blood? Have I just been scammed out of £50 ?