Laboratory Medicine and Quality Assurance

Table. 3.

Ct values and positive rates of SARS-CoV-2 test results according to the presence of symptoms by specimen type

Specimen Symptom positive Symptom negative


Ct value Positive rate Ct value Positive rate


E Rdrp E Rdrp
Nasopharyngeal swab 32.91 33.57 40.0% (2/5) 28.95 29.30 87.5% (35/40)
Anterior nasal swab 32.90 32.93 20.0% (1/5) 29.90 29.91 37.5% (15/40)
Saliva 33.40 33.60 20.0% (1/5) 31.08 31.26 60.0% (24/40)

Values are presented as mean or % (number).

Abbreviations: Ct, cycle threshold; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

Lab Med Qual Assur 2022;44:82~87 https://doi.org/10.15263/jlmqa.2022.44.2.82
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