Herpes Simplex Virus DNA PCR - Qualitative

A PCR test for herpes simplex virus is a molecular assay that detects HSV DNA in clinical samples (usually a swab from a lesion, cerebrospinal fluid in suspected encephalitis, or other tissues). It is highly sensitive and specific, provides rapid results, and can distinguish HSV‑1 from HSV‑2. PCR is the preferred method for diagnosing active HSV infection and serious complications like neonatal or central nervous system disease.

Herpes simplex virus type 1 (HSV‑1) usually causes mild, self‑limited cold sores and isn’t dangerous for most healthy people. However, it can be serious in newborns, immunocompromised people, or if it causes encephalitis or ocular infection, which may threaten vision. There’s no cure, but antivirals reduce severity and recurrence. Avoid contact during active lesions, practice good hygiene, and seek care for concerning symptoms.

A positive HSV‑1 PCR means highly sensitive detection of herpes simplex virus type 1 genetic material in the sample, indicating current viral presence or replication. It typically reflects active infection or asymptomatic shedding at that site and must be interpreted with clinical findings. In certain samples (e.g., cerebrospinal fluid) it signals invasive disease (encephalitis), prompting antiviral treatment and follow‑up.

PCR testing for herpes typically costs about $50–$300 in the United States (depending on lab and insurance), roughly ₹1,000–3,000 in India, and is often free at public sexual-health clinics in the UK (private labs may charge £40–£100). Actual cost varies by country, facility, sample type and insurance coverage—check with your clinic or insurer for exact fees.

PCR testing for herpes is highly accurate for detecting active HSV infections because it directly identifies viral DNA. Sensitivity and specificity are high, especially from swabs of fresh lesions or cerebrospinal fluid in suspected CNS disease. Sensitivity falls if lesions are healing or viral load is low, so prompt sampling is important. False positives are rare; serology assesses past exposure.

Many conditions can mimic herpes: aphthous (canker) ulcers, traumatic mouth sores, Behçet’s disease, yeast infections, bacterial STIs (syphilis, chancroid), molluscum contagiosum, shingles, contact dermatitis, allergic reactions, psoriasis, eczema, folliculitis, ingrown hairs or insect bites. Accurate diagnosis requires clinical exam and laboratory tests (swab, PCR, blood); see a clinician for proper testing and treatment.