The Prader staging system is a clinical calculator used to assess the degree of virilization of the external genitalia in females. This system is primarily used in patients with disorders of sex development (DSD), particularly those with conditions such as congenital adrenal hyperplasia (CAH) or androgen insensitivity syndrome (AIS). 

The Prader staging system ranges from stage 0, which represents typical female genitalia, to stage 5, which represents typical male genitalia. The stages in between describe varying degrees of virilization. 

The clinical utility of this calculator is to provide a standardized method of describing the degree of virilization, which can assist in diagnosis, management decisions, and communication between healthcare providers. It can also be used to monitor the progression of virilization over time.

There are no specific exclusion criteria for the use of the Prader staging system, but it is most relevant in patients with suspected or confirmed DSD. It is not typically used in individuals without these conditions.

Prader staging for virilization of female genitalia

# Criteria
 ## Findings of female external genitalia
A. Clitoromegaly, no labial fusion
B. Clitoromegaly, posterior labial fusion
C. Greater clitoromegaly, near-complete labial fusion, single perineal urogenital orifice
D. Phallus-like clitoris, complete labial fusion, urogenital sinus at the base of the clitoris
E. Penile clitoris, scrotum-like labia without palpable testes, urethral meatus at the tip of the phallus

# Conditions
- A
- B
- C
- D
- E
- true

[The syndrome of male pseudohermaphrodism in congenital adrenocortical hyperplasia without overproduction of androgens (adrenal male pseudohermaphrodism)].