Clark Level (Melanoma Invasion)
Clark level (Clark 1969) of a cutaneous melanoma — the anatomic skin layer invaded.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Clark level
- IV — reticular dermis
Result: Clark level IV: invasion into the reticular dermis; a deeper level of invasion.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Level I / II / III
- Intraepidermal in situ (I); partial papillary-dermis invasion (II); fills the papillary dermis to the reticular interface (III).
- Level IV
- Invasion into the reticular dermis. A deeper level of invasion.
- Level V
- Invasion into the subcutaneous fat. The deepest level of invasion.
What you enter
- Clark level
How this is calculated
Clark WH Jr, From L, Bernardino EA, Mihm MC. The histogenesis and biologic behavior of primary human malignant melanomas of the skin. Cancer Res. 1969;29(3):705-727. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.