How Is Melanoma (Skin Cancer) Diagnosed? Tests, Criteria & Process
Melanoma (Skin Cancer) diagnosis relies on Tissue biopsy (histopathology + immunohistochemistry), CT/PET-CT staging scan, Tumour markers (PSA, CA-125, CEA, AFP, CA 19-9). Learn the full diagnostic pathway, clinical criteria, differential workup, and what to expect at your evaluation.
Updated March 27, 2026
Melanoma (Skin Cancer) is diagnosed using Tissue biopsy (histopathology + immunohistochemistry), CT/PET-CT staging scan, Tumour markers (PSA, CA-125, CEA, AFP, CA 19-9) and targeted clinical evaluation. Melanoma is the most dangerous form of skin cancer, arising from melanocytes. UV radiation is the primary risk factor; early detection using the ABCDE criteria (Asymmetry, Border, Color, Diameter, Evolution) is critical for survival.
Clinical Context
The diagnostic process for Melanoma (Skin Cancer) begins with Cross-sectional imaging for mass lesion detection; biopsy for histological confirmation; staging workup before MDT treatment decision. Key investigations include Tissue biopsy (histopathology + immunohistochemistry), CT/PET-CT staging scan, Tumour markers (PSA, CA-125, CEA, AFP, CA 19-9), Full blood count and peripheral blood film. The gold standard is: Tissue biopsy is the gold standard for all malignancies; bone marrow trephine for haematological staging. Clinical guidelines from ESMO / ASCO / NCCN / ASH / NICE Oncology define the diagnostic criteria and recommended investigation pathway.
Clinical Pathway
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How Is Melanoma (Skin Cancer) Diagnosed? Tests, Criteria & Process?+
Melanoma (Skin Cancer) is diagnosed using Tissue biopsy (histopathology + immunohistochemistry), CT/PET-CT staging scan, Tumour markers (PSA, CA-125, CEA, AFP, CA 19-9) and targeted clinical evaluation. Melanoma is the most dangerous form of skin cancer, arising from melanocytes. UV radiation is the primary risk factor; early detection using the ABCDE criteria (Asymmetry, Border, Color, Diameter, Evolution) is critical for survival.
How do doctors test for melanoma (skin cancer)?+
The main tests used to diagnose Melanoma (Skin Cancer) include Tissue biopsy (histopathology + immunohistochemistry), CT/PET-CT staging scan, Tumour markers (PSA, CA-125, CEA, AFP, CA 19-9). Your doctor will select investigations based on your symptoms, clinical findings, and risk factors.
How long does it take to diagnose Melanoma (Skin Cancer)?+
The time to diagnosis varies. Some cases are identified within hours using clinical presentation and blood tests; others require weeks, repeated investigations, or specialist referral.
Can Melanoma (Skin Cancer) be missed on initial testing?+
Yes — Melanoma (Skin Cancer) can be missed if initial tests are negative or if the presentation is atypical. If clinical suspicion remains high, repeat testing or specialist referral is appropriate.
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