However, presence of a normal scrotum and palpable testes indicate a high probability of normal male karyotype. The following formula is commonly used to determine penile length in relation to gestational age: Penile length (cms) = 2.27 + 0.16 × (gestational age in weeks).Īt times, micropenis may be considered a form of ambiguous genitalia. The growth of penis during mid to late gestation is essentially linear. Measurements of less than 2-2.5 cm (2.5 standard deviations (SDs) below the mean) in a full-term newborn male meet the definition of micropenis and warrant further evaluation. The mean stretched penile length in a full-term newborn male is 3.5 cm.
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